CN109184309B - Shockproof support structure and support system - Google Patents
Shockproof support structure and support system Download PDFInfo
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- CN109184309B CN109184309B CN201811029472.4A CN201811029472A CN109184309B CN 109184309 B CN109184309 B CN 109184309B CN 201811029472 A CN201811029472 A CN 201811029472A CN 109184309 B CN109184309 B CN 109184309B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/027—Preventive constructional measures against earthquake damage in existing buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/024—Structures with steel columns and beams
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Abstract
The invention discloses a quakeproof support structure and a support system, and belongs to the field of steel frame-support structures. The support structure comprises two frame posts; the frame beam sections are connected to the top ends of the two frame columns; the left is connected to one end the bottom of frame post, the other end is connected first support on the frame beam section to and one end is connected the right side the bottom of frame post, the other end are connected second support on the frame beam section, wherein, first support and second support are not alternately. By adopting the support structure provided by the embodiment of the invention to improve the adjacent buildings (structures) of the dangerous buildings (structures), the lateral bearing capacity and the seismic energy dissipation capacity of the support structure towards the dangerous buildings (structures) are stronger than the deviation direction, the adjacent buildings (structures) are ensured not to collapse towards the dangerous buildings (structures) during earthquake, and thus secondary disasters caused by the collapse of the adjacent buildings (structures) can be avoided.
Description
Technical Field
The invention relates to the field of steel frame-supporting structures, in particular to an anti-seismic support structure and a support system.
Background
Earthquake is a serious natural disaster faced by human society. The earthquake has the characteristic of randomness, the influence of the earthquake possibly exceeds that of a rare earthquake, namely the ultra-rare earthquake, and when the ultra-rare earthquake occurs, a building (structure) is possibly collapsed, and the collapse direction is random. For example, in 2008, the superrare earthquake occurs in Wenchuan, which causes a large amount of buildings to collapse.
When an earthquake happens in an extremely rare case, if an adjacent building (structure) collapses and is hit to the dangerous building (structure), the safety of the structure of the building (structure) related to dangerous goods such as virulent, corrosive and radioactive substances (hereinafter referred to as a dangerous building (structure)) can be damaged, and further secondary disasters such as radioactive pollution, fire, explosion, virulent or strong corrosive substance leakage can be possibly caused or aggravated.
Disclosure of Invention
The embodiment of the invention provides a quakeproof support structure and a support system, which can solve the problem that a dangerous building (structure) is knocked down due to collapse of the building (structure).
Specifically, the method comprises the following technical scheme:
in a first aspect, there is provided a seismic damage prevention support structure, the support structure comprising:
two frame columns;
the frame beam section is connected to the top ends of the two frame columns;
one end of the first support is connected with the bottom end of the frame column on the left side, the other end of the first support is connected to the frame beam section, and the first support is an anti-buckling support;
one end of the second support is connected with the bottom end of the frame column on the right side, and the other end of the second support is connected to the frame beam section;
the first support and the second support are not crossed, and the frame beam section is divided into a left frame beam section, a middle frame beam section and a right frame beam section;
under the condition that seismic waves propagate from right to left, the left frame beam section and the right frame beam section can dissipate seismic energy through plastic deformation, and the structure formed by the frame columns, the middle frame beam section, the first support and the second support can bear the force generated by the seismic waves from right to left;
under the condition that seismic waves propagate from left to right, the left frame beam section can dissipate seismic energy through plastic deformation, and a structure formed by the frame columns, the middle frame beam section, the right frame beam section and the first support can bear the force generated by the seismic waves from left to right;
under the condition that the second support reaches the bearing force under pressure, the structure formed by the frame column, the left frame beam section, the middle frame beam section, the right frame beam section and the first support can bear the force generated by the seismic waves;
the left frame beam section and the right frame beam section only generate shearing plastic deformation energy consumption and cannot generate bending plastic deformation;
the compressive bearing capacity of the first support is not less than the tensile bearing capacity, and the tensile bearing capacity of the second support is greater than the compressive bearing capacity.
In one possible design, where the seismic waves propagate from right to left,
design resistance value R of the frame column1-1Satisfies the following conditions:
design resistance value R of the middle frame beam section1-22Satisfies the following conditions:
design resistance value R of the first support1-3Satisfies the following conditions:
design resistance value R of the second support1-4Satisfies the following conditions:
wherein S is1-1The design value of the load combination effect of the frame column is gamma when the frame column is combined in a multi-earthquake mode1-1A constant amplification factor, greater than 1.0;
S1-22the design value of the load combination effect of the middle frame beam section is gamma when the combination is in multi-earthquake1-22A constant amplification factor, greater than 1.0;
S1-3designed value of load combination effect of the first support in multi-earthquake combination, gamma1-3A constant amplification factor, greater than 1.0;
S1-4designed value of load combination effect of the second support when the second support is combined in multiple earthquakes, gamma1-4A constant amplification factor, greater than 1.0;
VSLthe left frame beam section is subjected to overall plastic shearing bearing force;
VSRthe right frame beam section is subjected to overall plastic shearing bearing force;
VL1when the left frame beam section is combined with the earthquake, the shear force of the load effect of the left frame beam section is obtained;
VR1load effect of the right frame beam section for multi-earthquake combinationShearing force.
In one possible design, in the case of seismic waves propagating from left to right,
design resistance value R of the frame column2-1Satisfies the following conditions:
design resistance value R of the middle frame beam section2-22Satisfies the following conditions:
design resistance value R of the right frame beam section2-23Satisfies the following conditions:
design resistance value R of the first support2-3Satisfies the following conditions:
wherein S is2-1The design value of the load combination effect of the frame column is gamma when the frame column is combined in a multi-earthquake mode2-1A constant amplification factor, greater than 1.0;
S2-22the design value of the load combination effect of the middle frame beam section is gamma when the combination is in multi-earthquake2-22A constant amplification factor, greater than 1.0;
S2-23the design value of the load combination effect, gamma, of the right frame beam section is the same as that of the right frame beam section in multi-earthquake combination2-23A constant amplification factor, greater than 1.0;
S2-3designed value of load combination effect of the first support in multi-earthquake combination, gamma2-3A constant amplification factor, greater than 1.0;
VSLthe left frame beam section is subjected to overall plastic shearing bearing force;
VL2and when the left frame beam section is combined in a multi-earthquake mode, the left frame beam section is subjected to load effect shearing force.
In one possible design, in the event that the second support reaches a load bearing capacity under pressure,
design resistance value R of the frame column3-1Satisfies the following conditions:
R3-1≥γ3-1.S3-1；
design resistance value R of the left frame beam section3-21Satisfies the following conditions:
R3-21≥γ3-21.S3-21；
design resistance value R of the middle frame beam section3-22Satisfies the following conditions:
R3-22≥γ3-22.S3-22；
design resistance value R of the right frame beam section3-23Satisfies the following conditions:
R3-23≥γ3-23.S3-23；
design resistance value R of the first support3-3Satisfies the following conditions:
R3-3≥γ3-3.S3-3；
wherein S is3-1The design value of the load combination effect of the frame column when the second support reaches the bearing force under pressure is gamma3-1A constant amplification factor, greater than 1.0;
S3-21the design value of the load combination effect of the left frame beam section when the second support reaches the bearing force under pressure is gamma3-21A constant amplification factor, greater than 1.0;
S3-22the design value of the load combination effect of the middle frame beam section when the second support reaches the bearing force under pressure is gamma3-22A constant amplification factor, greater than 1.0;
S3-23the design value of the load combination effect of the right frame beam section when the second support reaches the bearing force under pressure is gamma3-23A constant amplification factor, greater than 1.0;
S3-3designed value of load combination effect of the first support when the second support reaches the bearing capacity under pressure, gamma3-3Is a constant amplification factor, greater than 1.0.
In one possible design, the length L of the left frame beam sectionLAnd the length L of the right frame beam sectionRThe following conditions are satisfied:
wherein M isSLThe full plastic bending bearing capacity influenced by axial force is considered for the left frame beam section;
MSRthe full plastic bending bearing capacity influenced by axial force is considered for the right frame beam section;
VSLthe left frame beam section is subjected to overall plastic shearing bearing force;
VSRthe right frame beam section is subjected to overall plastic shearing bearing force.
In one possible design of the system, the system may be,
compressive bearing capacity N of the first support1-3And the tensile bearing force N2-3Comprises the following steps:
N1-3＝N2-3＝f1.An-3；
tensile bearing force N of the second support1-4Greater than compressive bearing capacity N2-4Comprises the following steps:
N1-4＝f2.An-4，
N2-4＝Ψ.f2.An-4’；
wherein f is1Designing a value for the steel strength of the first support;
f2designing a value for the steel strength of the second support;
An-3is the net cross-sectional area of the first support;
An-4is the net cross-sectional area of the second support;
An-4' is the bristle cross-sectional area of the second support;
psi is the stable coefficient of the axial compression component, and psi is less than or equal to 1.0.
In a second aspect, there is provided an earthquake damage prevention support system comprising a plurality of support structures as set forth in the first aspect;
and a plurality of the support structures are longitudinally stacked.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
by adopting the support structure provided by the embodiment of the invention to improve the adjacent buildings (structures) of the dangerous buildings (structures), the lateral bearing capacity and the seismic energy dissipation capacity of the support structure towards the dangerous buildings (structures) are stronger than the deviation direction, the adjacent buildings (structures) are ensured not to collapse towards the dangerous buildings (structures) during earthquake, and thus secondary disasters caused by the collapse of the adjacent buildings (structures) can be avoided. And the supporting structure is convenient to construct and has low requirements on construction conditions and requirements.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an earthquake damage prevention support structure according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another quake-proof supporting structure according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an earthquake damage prevention support system according to an embodiment of the present invention.
The reference numerals in the drawings denote:
1-frame columns;
2-frame beam section; 21-left frame beam section; 22-middle frame beam section; 23-right frame beam section;
3-a first support;
4-second support.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings. Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like are used in a variety of orientations and positional relationships based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship with which the product of the present invention is conventionally placed during use, and are used for convenience in describing and simplifying the present invention, but do not indicate or imply that the structure or system being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present invention. Furthermore, the terms "first", "second", etc. are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
In a first aspect, an embodiment of the present invention provides an earthquake damage prevention support structure, as shown in fig. 1, the support structure including:
two frame columns 1;
the frame beam section 2 is connected to the top ends of the two frame columns 1;
one end of the first support 3 is connected with the bottom end of the left frame column 1, the other end of the first support 3 is connected to the frame beam section 2, and the first support 3 is an anti-buckling support;
one end of the second support 4 is connected with the bottom end of the right frame column 1, and the other end of the second support 4 is connected to the frame beam section 2;
the first support 3 and the second support 4 are not crossed and divide the frame beam section 2 into a left frame beam section 21, a middle frame beam section 22 and a right frame beam section 23;
under the condition that seismic waves propagate from right to left, the left frame beam section 21 and the right frame beam section 23 can dissipate seismic energy through plastic deformation, and a structure formed by the frame column 1, the middle frame beam section 22, the first support 3 and the second support 4 can bear the force generated by the seismic waves from right to left;
under the condition that seismic waves are transmitted from left to right, the left frame beam section 21 can dissipate seismic energy through plastic deformation, and a structure formed by the frame column 1, the middle frame beam section 22, the right frame beam section 23 and the first support 3 can bear the force generated by the seismic waves from left to right;
under the condition that the second support 4 achieves compressive bearing capacity, the structure formed by the frame column 1, the left frame beam section 21, the middle frame beam section 22, the right frame beam section 23 and the first support 3 can bear the force generated by seismic waves;
the left frame beam section 21 and the right frame beam section 23 only generate shearing plastic deformation energy consumption and do not generate bending plastic deformation;
the compressive bearing capacity of the first support 3 is not less than the tensile bearing capacity, and the tensile bearing capacity of the second support 4 is greater than the compressive bearing capacity.
It is understood that the above "being able to withstand the force generated by the seismic wave" means that the relevant components are not damaged, for example, the structure formed by the frame column 1, the middle frame beam section 22, the first support 3 and the second support 4 is able to withstand the force generated by the seismic wave from right to left ", that is, in the case that the seismic wave propagates from right to left, the frame column 1, the middle frame beam section 22, the first support 3 and the second support 4 are not damaged.
Taking the supporting structure shown in fig. 1 (the first support 3 is disposed on the left side, and the second support 4 is disposed on the right side) as an example, the working principle of the supporting structure provided by the embodiment of the present invention is as follows:
1) under the condition that seismic waves are transmitted from right to left, the first support 3 is in a compressed state, and the second support 4 is in a pulled state; in the case of seismic waves propagating from left to right, the first support 3 is in tension and the second support 4 is in compression. As the compression bearing capacity of the first support 3 is not less than the tension bearing capacity, and the compression bearing capacity of the second support 4 is less than the tension bearing capacity, the second support 4 is gradually compressed and destabilized along with the increase of the earthquake load, so that the lateral bearing capacity of the structure from right to left is greater than the lateral bearing capacity from left to right.
2) Under the condition that seismic waves are transmitted from right to left, the first support 3 is in a compression state, the second support 4 is in a tension state, and with the increase of seismic loads, the left frame beam section 21 and the right frame beam section 23 are subjected to yielding dissipation seismic energy before the frame column 1, the middle frame beam section 22, the first support 3 and the second support 4 are subjected to yielding dissipation; under the condition that seismic waves are transmitted from left to right, the first support 3 is in a tension state, the second support 4 is in a compression state, the second support 4 is gradually subjected to compression and instability along with the increase of seismic loads, the right frame beam section 23 connected with the second support 4 does not yield, and only the left frame beam section 21 connected with the first support 3 yields to dissipate seismic energy. Thus, when the earthquake is from right to left, the structure's ability to dissipate seismic energy is greater than the earthquake's ability to dissipate seismic energy from left to right.
Thus, for the above-described support structure, when the earthquake is from right to left, neither the lateral bearing capacity nor the seismic energy dissipation capacity is greater than when the earthquake is from left to right. Thus, when an ultra rare earthquake occurs, even if the structure collapses, only a collapse from left to right occurs.
Similarly, if the structure collapses from right to left in the event of an extremely rare earthquake, the positions of the first support 3 and the second support 4, and the corresponding left frame beam section 21 and right frame beam section 23 in the scheme need only be changed, as shown in fig. 2.
By adopting the support structure provided by the embodiment of the invention to improve the adjacent buildings (structures) of the dangerous buildings (structures), the lateral bearing capacity and the seismic energy dissipation capacity of the support structure towards the dangerous buildings (structures) are stronger than the deviation direction, the adjacent buildings (structures) are ensured not to collapse towards the dangerous buildings (structures) during earthquake, and thus secondary disasters caused by the collapse of the adjacent buildings (structures) can be avoided. And the supporting structure is convenient to construct and has low requirements on construction conditions and requirements.
According to the statistical analysis of the earthquake occurrence probability which affects the building engineering, for a region, the earthquake intensity with the exceeding probability of about 63 percent in 50 years is the earthquake mode intensity, which is called 'multi-chance earthquake', namely minor earthquake; the seismic intensity with the exceeding probability of about 10 percent in 50 years is the basic seismic intensity, which is called as the 'fortification seismic', namely the middle seismic; earthquake intensity with the exceeding probability of about 2-3% within 50 years is called rare earthquake, namely major earthquake.
Three level targets for building earthquake fortification: the small earthquake is not damaged, the middle earthquake can be repaired, and the large earthquake is not fallen. The method comprises the following specific steps:
a first level: when the structure is affected by the earthquake in the local area, the main structure can be continuously used without being damaged or repaired;
and a second level: when the structure is affected by local fortification earthquake, the structure can be damaged, but can still be used continuously after general repair;
and a third level: when the structure is affected by a local rare earthquake, the structure does not collapse or serious damage which endangers life occurs.
During the structural design, adopt two stage design to realize the fortification target of above-mentioned three levels, specifically as follows:
checking and calculating the bearing capacity of the structure at the first stage: and calculating the elastic earthquake action standard value and the corresponding earthquake action effect of the structure by taking the horizontal earthquake influence coefficient of the multi-earthquake, and carrying out earthquake resistance checking calculation on the section bearing capacity of the structural member according to the corresponding specification rule to achieve the aim of preventing the first level structure from being damaged by small earthquake and simultaneously achieve the aim of repairing the second level structure by damage.
And (3) checking and calculating the elastic-plastic deformation of the structure at the second stage: and taking the horizontal earthquake influence coefficient of a rare earthquake, carrying out structural elastic-plastic interlayer deformation checking calculation, ensuring that the deformation does not exceed the rule specification maximum value range, and adopting corresponding anti-seismic construction measures to achieve the aim of preventing the third level structure from falling down due to severe earthquakes.
Based on this, in the above-described support structure, when the seismic wave propagates from right to left, the following design may be performed for the frame column 1, the middle frame beam section 22, the first support 3, and the second support 4:
resistance design value R of frame column 11-1Satisfies the following conditions:
design resistance R of middle frame beam section 221-22Satisfies the following conditions:
design value of resistance R of the first support 31-3Satisfies the following conditions:
design value of resistance R of second support 41-4Satisfies the following conditions:
wherein S is1-1The design value of the load combination effect, gamma, of the frame column 1 is used for the combination of multiple earthquakes1-1A constant amplification factor, greater than 1.0;
S1-22for multi-earthquake combination, the design value of the load combination effect of the middle frame beam section 22 is gamma1-22A constant amplification factor, greater than 1.0;
S1-3designed value of the load combination effect, gamma, of the first support 3 for multi-earthquake combination1-3A constant amplification factor, greater than 1.0;
S1-4designed value of load combination effect, gamma, of the second support 4 when combined in multiple earthquakes1-4A constant amplification factor, greater than 1.0;
VSLthe left frame beam section 21 is subjected to overall plastic shearing bearing force;
VSRthe right frame beam section 23 is subjected to overall plastic shearing bearing force;
VL1the load effect shear of the left frame beam section 21 when combined in a multi-earthquake scenario;
VR1in the event of a combination of multiple earthquakes, the right frame beam section 23 is in shear with a load effect.
Further, γ1-1、γ1-22、γ1-3、γ1-4The value of (a) is related to the earthquake-resistant grade of the structure, and specifically, reference can be made to building design earthquake-resistant specification (GB 50011-2010). The method comprises the following steps:
when the earthquake resistance grade is grade 1, the earthquake resistance grade is more than or equal to 1.3;
when the earthquake resistance grade is grade 2, the earthquake resistance grade is more than or equal to 1.2;
when the earthquake resistance grade is grade 3, the earthquake resistance grade is more than or equal to 1.1.
S1-1、S1-22、S1-3、S1-4The method is a design value for the load combination effect of each component under the condition that the seismic waves propagate from right to left. It can be obtained by engineering calculation analysis software in the structural analysis process, for example: SAP2000, STAAD. PRO, etc.
VSL、VSRThe expression formula of the overall plastic shearing bearing capacity is different when the section types are different relative to the section types of the components.
Illustratively, when the member cross-section is an I-shaped cross-section, the overall plastic shear bearing capacity V isSL、VSRThe formula of the calculation can be expressed as: 0.6. fy·hw·tw；
fyBeam steel yield strength, which can be found in the corresponding specifications;
hw-web height;
tw-beam web thickness;
of course, the cross section of the member may be of another type, not limited to the I shape.
And load effect shear force VL1、VR1And can also be obtained by engineering calculation analysis software.
In one possible real-time manner, the first support 3 may be an anti-buckling support and the second support 4 may be a plain support.
In the above-mentioned support structure, when the seismic wave propagates from left to right, the following design can be performed for the frame column 1, the middle frame beam section 22, the right frame beam section 23, and the first support 3:
of frame columns 1Design value of resistance R2-1Satisfies the following conditions:
design resistance R of middle frame beam section 222-22Satisfies the following conditions:
design resistance R of right frame beam section 232-23Satisfies the following conditions:
design value of resistance R of the first support 32-3Satisfies the following conditions:
wherein S is2-1The design value of the load combination effect, gamma, of the frame column 1 is used for the combination of multiple earthquakes2-1A constant amplification factor, greater than 1.0;
S2-22for multi-earthquake combination, the design value of the load combination effect of the middle frame beam section 22 is gamma2-22A constant amplification factor, greater than 1.0;
S2-23for the combination of multiple earthquakes, the design value of the load combination effect of the right frame beam section 23, gamma2-23A constant amplification factor, greater than 1.0;
S2-3designed value of the load combination effect, gamma, of the first support 3 for multi-earthquake combination2-3A constant amplification factor, greater than 1.0;
VSLthe left frame beam section 21 is subjected to overall plastic shearing bearing force;
VL2in the event of a combination of multiple earthquakes, the left frame beam section 21 is in shear with a load effect.
Wherein, γ2-1、γ2-22、γ2-23、γ2-3The value of (a) is related to the earthquake-resistant grade of the structure, and specifically, reference can be made to building design earthquake-resistant specification (GB 50011-2010). The method comprises the following steps:
when the earthquake resistance grade is grade 1, the earthquake resistance grade is more than or equal to 1.3;
when the earthquake resistance grade is grade 2, the earthquake resistance grade is more than or equal to 1.2;
when the earthquake resistance grade is grade 3, the earthquake resistance grade is more than or equal to 1.1.
S2-1、S2-22、S2-23、S2-3In the case of seismic waves propagating from left to right, the design value of the load combination effect of each component can be obtained through engineering calculation analysis software in the structural analysis process, for example: SAP2000, STAAD. PRO, etc.
For VSR、VR2The above description is exemplary and will not be repeated herein.
In the above-mentioned support structure, when the second support 4 reaches the compressive bearing capacity, the following design can be performed for the frame column 1, the left frame beam section 21, the middle frame beam section 22, the right frame beam section 23, and the first support 3:
resistance design value R of frame column 13-1Satisfies the following conditions:
R3-1≥γ3-1.S3-1；
design resistance value R of left frame beam section 213-21Satisfies the following conditions:
R3-21≥γ3-21.S3-21；
design resistance R of middle frame beam section 223-22Satisfies the following conditions:
R3-22≥γ3-22.S3-22；
design resistance R of right frame beam section 233-23Satisfies the following conditions:
R3-23≥γ3-23.S3-23；
design value of resistance R of the first support 33-3Satisfies the following conditions:
R3-3≥γ3-3.S3-3；
wherein S is3-1When the second support 4 reaches the bearing force in compression, the frame column 1Design value of load combination effect of (1) (. gamma.)3-1A constant amplification factor, greater than 1.0;
S3-21designed value of load combination effect, gamma, of the left frame beam section 21 when the second support 4 reaches the compressive bearing force3-21A constant amplification factor, greater than 1.0;
S3-22designed value of the load combination effect of the middle frame beam section 22 when the second support 4 reaches the compressive bearing force, gamma3-22A constant amplification factor, greater than 1.0;
S3-23designed value of the load combination effect of the right frame beam section 23 when the second support 4 reaches the compressive bearing force, γ3-23A constant amplification factor, greater than 1.0;
S3-3designed for the load combination effect of the first support 3 when the second support 4 reaches the compressive load capacity, gamma3-3Is a constant amplification factor, greater than 1.0.
Wherein, γ3-1、γ3-21、γ3-22、γ3-23、γ3-3The value of (a) is related to the earthquake-resistant grade of the structure, and specifically, reference can be made to building design earthquake-resistant specification (GB 50011-2010). The method comprises the following steps:
when the earthquake resistance grade is grade 1, the earthquake resistance grade is more than or equal to 1.3;
when the earthquake resistance grade is grade 2, the earthquake resistance grade is more than or equal to 1.2;
when the earthquake resistance grade is grade 3, the earthquake resistance grade is more than or equal to 1.1.
S3-1、S3-21、S3-22、S3-23、S3-3In order to design the load combination effect of each component when the second support 4 reaches the compressive bearing capacity, the design value can be obtained by engineering calculation analysis software in the structural analysis process, for example: SAP2000, STAAD. PRO, etc.
In the above-described support structure, the length L of the left frame beam section 21LAnd length L of right frame beam section 23RThe following conditions are satisfied:
wherein M isSLThe full plastic flexural capacity of the left frame beam section 21 under the influence of axial force is considered;
MSRthe right frame beam section 23 is considered to have an overall plastic flexural capacity affected by the axial force;
VSLthe left frame beam section 21 is subjected to overall plastic shearing bearing force;
VSRis the overall plastic shear load bearing capacity of the right frame beam section 23.
In addition, MSL、MSRThe expression formula of the all-plastic bending bearing capacity is different when the section types are different relative to the section types of the components.
Illustratively, when the cross section of the component is an I-shaped cross section, the overall plastic flexural bearing capacity MSL、MSRThe formula of the calculation can be expressed as: (f)y-a)·Wpb
fyThe yield strength of the steel of the beam section, which can be found in the corresponding specifications.
aFlange mean positive stress caused by axial forces.
WpbThe modulus of the section of the beam, and the dimensions B, t, h, t of the beam sectionwEtc. (B denotes the width of the flange of the beam section, t denotes the thickness of the flange of the beam section, h denotes the height of the beam section, t denotes the height of the beam sectionwRepresenting the energy dissipating beam segment web thickness).
Of course, the cross section of the member may be of another type, not limited to the I shape.
For VSL、VSRThe above description is exemplary and will not be repeated herein.
In the above-described support structure, the compressive bearing force N of the first support 31-3And the tensile bearing force N2-3Comprises the following steps:
N1-3＝N2-3＝f1.An-3；
tensile bearing force N of second support 41-4Greater than under pressureBearing capacity N2-4Comprises the following steps:
N1-4＝f2.An-4，
N2-4＝Ψ.f2.An-4’；
wherein f is1A design value for the steel strength of the first support 3;
f2a steel strength design value for the second support 4;
An-3is the net cross-sectional area of the first support 3;
An-4is the net cross-sectional area of the second support 4;
An-4' is the bristle cross-sectional area of the second support 4;
psi is the stable coefficient of the axial compression component, and psi is less than or equal to 1.0.
f1And f2The design value of the strength of the steel can be determined according to the design specification of the steel structure. The value of the support is only related to the grade of steel, and in practical engineering, the first support 3 and the second support 4 can adopt steel with the same grade or steel with different grades.
Psi can be specifically determined according to appendix C of the design Specification for Steel structures (GB 50017-2003).
It will be appreciated that the net cross-sectional area may be equal to the area of the bristle cross-section minus the area of the cross-sectional weakened portion.
In a second aspect, embodiments of the present invention further provide an earthquake damage prevention support system, as shown in fig. 3, the support system may include a plurality of support structures as mentioned in the first aspect;
and a plurality of support structures are longitudinally stacked.
By adopting the supporting system provided by the embodiment of the invention to improve the adjacent buildings (structures) of the dangerous buildings (structures), the lateral bearing capacity and the seismic energy dissipation capacity of the adjacent buildings (structures) towards the dangerous buildings (structures) are stronger than the deviation direction, the adjacent buildings (structures) are ensured not to collapse towards the dangerous buildings (structures) during earthquake, and thus secondary disasters caused by the collapse of the adjacent buildings (structures) can be avoided. And the supporting structure is convenient to construct and has low requirements on construction conditions and requirements.
For obtaining the parameters, reference may be made to the obtaining methods in the prior art. For example, the parameters such as the design value of the load combination effect of the related components when the combination of multiple earthquakes is performed, the design value of the load combination effect of the related components when the second support reaches the compressive bearing capacity and the like can be obtained by referring to pages 12 and 42 of the building earthquake-resistant design specification (GB50011-2010), and page 46 of the high-rise civil building steel structure technical specification (JGJ 99-2015), and combining engineering calculation analysis software (such as SAP2000, STAAD. PRO and other software); the acquisition of parameters such as the all-plastic shear bearing capacity of the related components, the all-plastic bending bearing capacity considering the influence of axial force and the like can refer to page 101 of the anti-seismic design Specification of structures (GB 50191 and 2012); the "compressive load capacity and tensile load capacity of the relevant member" can be obtained by referring to page 36 of the design Specification for Steel Structure (GB 50017-2003).
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A damage-resistant support structure, the support structure comprising:
two frame columns (1);
the frame beam section (2), the frame beam section (2) is connected to the top ends of the two frame columns (1);
one end of the first support (3) is connected with the bottom end of the left frame column (1), the other end of the first support (3) is connected to the frame beam section (2), and the first support (3) is an anti-buckling support;
one end of the second support (4) is connected with the bottom end of the frame column (1) on the right side, and the other end of the second support (4) is connected to the frame beam section (2);
the first support (3) and the second support (4) do not intersect and divide the frame beam section (2) into a left frame beam section (21), a middle frame beam section (22) and a right frame beam section (23);
it is also characterized in that the method comprises the following steps,
under the condition that seismic waves propagate from right to left, the left frame beam section (21) and the right frame beam section (23) can dissipate seismic energy through plastic deformation, and a structure formed by the frame column (1), the middle frame beam section (22), the first support (3) and the second support (4) can bear the force generated by the seismic waves from right to left;
under the condition that seismic waves propagate from left to right, the left frame beam section (21) can dissipate seismic energy through plastic deformation, and the structure formed by the frame column (1), the middle frame beam section (22), the right frame beam section (23) and the first support (3) can bear the force generated by the seismic waves from left to right;
under the condition that the second support (4) achieves compressive bearing capacity, the structure formed by the frame column (1), the left frame beam section (21), the middle frame beam section (22), the right frame beam section (23) and the first support (3) can bear the force generated by the seismic waves;
the left frame beam section (21) and the right frame beam section (23) only generate shearing plastic deformation energy consumption and do not generate bending plastic deformation;
the compressive bearing capacity of the first support (3) is not less than the tensile bearing capacity, and the tensile bearing capacity of the second support (4) is greater than the compressive bearing capacity.
2. The support structure of claim 1, wherein, in the case of seismic waves propagating from right to left,
design resistance value R of the frame column (1)1-1Satisfies the following conditions:
design value R of resistance of the middle frame beam section (22)1-22Satisfies the following conditions:
designed resistance value R of the first support (3)1-3Satisfies the following conditions:
design resistance value R of the second support (4)1-4Satisfies the following conditions:
wherein S is1-1The design value of the load combination effect, gamma, of the frame column (1) is a design value when the combination is in multi-earthquake1-1A constant amplification factor, greater than 1.0;
S1-22for the combination of multiple earthquakes, the design value of the load combination effect of the middle frame beam section (22), gamma1-22A constant amplification factor, greater than 1.0;
S1-3designed value of the load combination effect of the first support (3) for multi-earthquake combination, gamma1-3A constant amplification factor, greater than 1.0;
S1-4the design value of the load combination effect of the second support (4) is gamma when the combination is multi-earthquake1-4A constant amplification factor, greater than 1.0;
VSLthe left frame beam section (21) is subjected to overall plastic shearing bearing force;
VSRthe right frame beam section (23) is subjected to overall plastic shearing bearing force;
VL1the load effect shear of the left frame beam section (21) when combined for multiple earthquakes;
VR1and when the combined structure is in multi-earthquake combination, the right frame beam section (23) is in load effect shearing force.
3. The support structure of claim 1, wherein, in the case of seismic waves propagating from left to right,
design resistance value R of the frame column (1)2-1Satisfies the following conditions:
design value R of resistance of the middle frame beam section (22)2-22Satisfies the following conditions:
design value R of resistance of the right frame beam section (23)2-23Satisfies the following conditions:
designed resistance value R of the first support (3)2-3Satisfies the following conditions:
wherein S is2-1The design value of the load combination effect, gamma, of the frame column (1) is a design value when the combination is in multi-earthquake2-1A constant amplification factor, greater than 1.0;
S2-22for the combination of multiple earthquakes, the design value of the load combination effect of the middle frame beam section (22), gamma2-22A constant amplification factor, greater than 1.0;
S2-23for the combination of multiple earthquakes, the design value of the load combination effect of the right frame beam section (23), gamma2-23A constant amplification factor, greater than 1.0;
S2-3designed value of the load combination effect of the first support (3) for multi-earthquake combination, gamma2-3A constant amplification factor, greater than 1.0;
VSLthe left frame beam section (21) is subjected to overall plastic shearing bearing force;
VL2for multi-earthquake combinations, of said left frame beam sections (21)Load effect shear.
4. Support structure according to claim 1, characterized in that in case the second support (4) reaches a load bearing capacity in compression,
design resistance value R of the frame column (1)3-1Satisfies the following conditions:
R3-1≥γ3-1.S3-1；
design resistance value R of the left frame beam section (21)3-21Satisfies the following conditions:
R3-21≥γ3-21.S3-21；
design value R of resistance of the middle frame beam section (22)3-22Satisfies the following conditions:
R3-22≥γ3-22.S3-22；
design value R of resistance of the right frame beam section (23)3-23Satisfies the following conditions:
R3-23≥γ3-23.S3-23；
designed resistance value R of the first support (3)3-3Satisfies the following conditions:
R3-3≥γ3-3.S3-3；
wherein S is3-1Designed value of the load combination effect of the frame column (1) when the second support (4) reaches the compressive bearing capacity, gamma3-1A constant amplification factor, greater than 1.0;
S3-21designed value of load combination effect, gamma, of the left frame beam section (21) when the second support (4) reaches a compressive bearing force3-21A constant amplification factor, greater than 1.0;
S3-22designed value of the load combination effect of the middle frame beam section (22) when the second support (4) reaches the compressive bearing capacity, gamma3-22A constant amplification factor, greater than 1.0;
S3-23designed value of the load combination effect of the right frame beam section (23) when the second support (4) reaches a compressive bearing force, gamma3-23A constant amplification factor, greater than 1.0;
S3-3designed for the load-combining effect of the first support (3) when the second support (4) reaches a compressive load-bearing capacity, γ3-3Is a constant amplification factor, greater than 1.0.
5. The support structure of claim 1, wherein the length L of the left frame beam section (21)LAnd the length L of the right frame beam section (23)RThe following conditions are satisfied:
wherein M isSLThe left frame beam section (21) is subjected to full plastic bending bearing capacity under the influence of axial force;
MSRthe right frame beam section (23) is subjected to full plastic bending bearing capacity under the influence of axial force;
VSLthe left frame beam section (21) is subjected to overall plastic shearing bearing force;
VSRthe right frame beam section (23) is subjected to overall plastic shearing bearing force.
6. The support structure of claim 1,
the bearing capacity N under pressure of the first support (3)1-3And the tensile bearing force N2-3Comprises the following steps:
N1-3＝N2-3＝f1.An-3；
the tensile bearing force N of the second support (4)1-4Greater than compressive bearing capacity N2-4Comprises the following steps:
N1-4＝f2.An-4，
N2-4＝Ψ.f2.An-4’；
wherein f is1Is the first support (3)The design value of the steel strength;
f2a design value for the steel strength of the second support (4);
An-3is the clear cross-sectional area of the first support (3);
An-4is the clear cross-sectional area of the second support (4);
An-4' is the cross-sectional area of the bristles of the second support (4);
psi is the stable coefficient of the axial compression component, and psi is less than or equal to 1.0.
7. An earthquake damage prevention support system, characterized in that the support system comprises a plurality of support structures according to any one of claims 1-6;
and a plurality of the support structures are longitudinally stacked.
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| CN204491833U (en) * | 2015-02-06 | 2015-07-22 | 东南大学 | A kind of novel high-performance steel framed structure |
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| US7707788B2 (en) * | 2007-03-19 | 2010-05-04 | Kazak Composites, Incorporated | Buckling restrained brace for structural reinforcement and seismic energy dissipation and method of producing same |
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