CN114293674A - Connecting beam with SMA friction composite damper and SMA friction composite damper - Google Patents
Connecting beam with SMA friction composite damper and SMA friction composite damper Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 176
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- 229910001369 Brass Inorganic materials 0.000 description 1
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- 239000012141 concentrate Substances 0.000 description 1
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Abstract
The invention provides a connecting beam with an SMA friction composite damper and the SMA friction composite damper, wherein the connecting beam comprises a left non-energy dissipation beam section and a right non-energy dissipation beam section which are oppositely arranged, and an upper chord and a lower chord are hinged between the left non-energy dissipation beam section and the right non-energy dissipation beam section; a first SMA friction composite damper is hinged between the left non-energy dissipation beam section and the inner side of the upper chord, a second SMA friction composite damper is hinged between the upper chord and the inner side of the right non-energy dissipation beam section, a third SMA friction composite damper is hinged between the right non-energy dissipation beam section and the inner side of the lower chord, and a fourth SMA friction composite damper is hinged between the lower chord and the inner side of the left non-energy dissipation beam section. According to the connecting beam with the SMA friction composite damper, the first SMA friction composite damper, the second SMA friction composite damper, the third SMA friction composite damper and the fourth SMA friction composite damper are adopted, so that self-repairing can be realized during an earthquake, that is, the energy consumption capability of the connecting beam is improved, and the residual displacement of the connecting beam after the earthquake is reduced.
Description
Technical Field
The invention belongs to the technical field of earthquake resistance and disaster prevention and reduction of civil engineering structures, and relates to a connecting beam with an SMA friction composite damper, in particular to a connecting beam with an SMA friction composite damper and an SMA friction composite damper.
Background
The high-rise building needs to have the capability of quickly recovering the function after the earthquake, and the comprehensive use of the low-damage component and the replaceable component is an effective way for improving the capability of quickly recovering the function of the high-rise building structure after the earthquake. Shear walls, frames-shear walls or frames-core tubes are widely adopted as lateral force resistant structural systems in high-rise buildings in China. In the structure, the reinforced concrete shear wall has higher bearing capacity and lateral rigidity, is a main lateral force resisting component and shares the main earthquake action. When the use function requirement is met or the wall section is long, a hole is formed in the wall body, and a connecting beam is arranged above the hole to form the coupled shear wall. The coupled wall resists overturning moment caused by lateral force together by wall bending moment and coupling moment generated by shearing force of the coupled beam, the coupled beam is used as a first defense line during the design of the coupled wall for earthquake resistance, the coupled beam firstly yields when an earthquake occurs, and plastic hinges generated at two ends of the coupled beam dissipate certain earthquake energy, thereby playing a role in protecting the wall. The conventional coupling beam has the following problems: the ductility is poor, the energy consumption capability is general, the damage is easy to happen, and the post-earthquake repair is difficult, so the improvement of the energy consumption performance and ductility of the coupling beam and the post-earthquake repairability are particularly important.
The existing coupled shear wall with the replaceable coupling beam can concentrate plastic damage on the coupling beam with the replaceable part, but the replaceable part has the problems of heavy weight and large residual displacement after an earthquake, and is not beneficial to replacing a damaged component; removable part and non-energy dissipation beam section generally adopt high-strength bolt to connect, dismantle inconvenient, influence after the shake change efficiency and degree of resumeing. In addition, in the existing self-resetting coupling beam structure, the coupling beam and the wall limb are generally connected through prestressed tendons, energy dissipation components are placed at the corner of the coupling beam, and the damper generates displacement by utilizing the swinging of the coupling beam to dissipate seismic energy, so that the coupling beam has an axial extension effect and is not beneficial to a floor slab.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a connecting beam with an SMA friction composite damper and the SMA friction composite damper, and solve the technical problems that the connecting beam in the prior art is low in energy consumption capability and large in residual displacement after the connecting beam shakes.
In order to solve the technical problems, the invention adopts the following technical scheme:
a connecting beam with an SMA friction composite damper comprises a left non-energy dissipation beam section and a right non-energy dissipation beam section which are oppositely arranged, wherein an upper chord and a lower chord are hinged between the left non-energy dissipation beam section and the right non-energy dissipation beam section, and the upper chord and the lower chord are oppositely arranged in parallel and transversely;
the inner side of the left non-energy dissipation beam section is hinged with one end of a first SMA friction composite damper, the other end of the first SMA friction composite damper is hinged on the inner side of the upper chord, the inner side of the upper chord is hinged with one end of a second SMA friction composite damper, the other end of the second SMA friction composite damper is hinged on the inner side of the right non-energy dissipation beam section, the inner side of the right non-energy dissipation beam section is hinged with one end of a third SMA friction composite damper, the other end of the third SMA friction composite damper is hinged on the inner side of the lower chord, the inner side of the lower chord is hinged with one end of a fourth SMA friction composite damper, and the other end of the fourth SMA friction composite damper is hinged on the inner side of the left non-energy dissipation beam section;
the first SMA friction composite damper, the second SMA friction composite damper, the third SMA friction composite damper and the fourth SMA friction composite damper have the same structure;
the first SMA friction composite damper comprises a first friction steel plate hinged on the inner side of the left non-energy dissipation beam section and a second friction steel plate hinged on the inner side of the upper chord; the second friction steel plate is provided with a plurality of strip-shaped bolt holes, high-strength bolts are movably arranged in the strip-shaped bolt holes, and the high-strength bolts are fixedly arranged on the first friction steel plate; the first friction steel plate and the second friction steel plate are connected through the strip-shaped bolt holes and the high-strength bolts, and the first friction steel plate and the second friction steel plate can move relatively;
the first friction steel plate is movably sleeved with a first end plate close to the outside, and the second friction steel plate is movably sleeved with a second end plate; a first square steel pipe and a second square steel pipe are arranged between the first end plate and the second end plate, and the first square steel pipe and the second square steel pipe are arranged oppositely in parallel;
one end of the first square steel pipe is fixed on the first friction steel plate, and the other end of the first square steel pipe is close to the second end plate and is not fixed; one end of the second square steel pipe is close to the first end plate and is not fixed, and the other end of the second square steel pipe is fixed on the second friction steel plate;
a first SMA rod is arranged in the first square steel pipe, and two ends of the first SMA rod are fixedly arranged on the first end plate and the second end plate respectively; and a second SMA rod is arranged in the second square steel pipe, and two ends of the second SMA rod are fixedly arranged on the first end plate and the second end plate respectively.
The invention also has the following technical characteristics:
the first SMA friction composite damper, the second SMA friction composite damper, the third SMA friction composite damper and the fourth SMA friction composite damper are arranged in a pairwise opposite mode, the first SMA friction composite damper is parallel to the third SMA friction composite damper, and the second SMA friction composite damper is parallel to the fourth SMA friction composite damper.
A first hinge element is arranged at the middle position of the inner side of the left non-energy dissipation beam section; a second hinge part and a third hinge part are sequentially arranged in the middle of the inner side of the upper chord from left to right; a fourth hinged part is arranged in the middle of the inner side of the right non-energy dissipation beam section; and a fifth hinging piece and a sixth hinging piece are sequentially arranged in the middle of the inner side of the lower chord from left to right.
A first lug plate and a second lug plate are respectively arranged at two ends of the first SMA friction composite damper; a third lug plate and a fourth lug plate are respectively arranged at two ends of the second SMA friction composite damper; a fifth lug plate and a sixth lug plate are respectively arranged at two ends of the third SMA friction composite damper; a seventh lug plate and an eighth lug plate are respectively arranged at two ends of the fourth SMA friction composite damper;
the first ear plate is hinged in the upper half part of the first hinged part, the second ear plate is hinged in the second hinged part, the third ear plate is hinged in the third hinged part, the fourth ear plate is hinged in the upper half part of the fourth hinged part, the fifth ear plate is hinged in the lower half part of the fourth hinged part, the sixth ear plate is hinged in the sixth hinged part, the seventh ear plate is hinged in the fifth hinged part, and the eighth ear plate is hinged in the lower half part of the first hinged part.
The top of the inner side of the left non-energy dissipation beam section is provided with a first connecting end, and the bottom of the inner side of the left non-energy dissipation beam section is provided with a second connecting end; the top of the inner side of the right non-energy dissipation beam section is provided with a third connecting end, and the bottom of the inner side of the right non-energy dissipation beam section is provided with a fourth connecting end; the first connecting end, the second connecting end, the third connecting end and the fourth connecting end are arranged oppositely in pairs and have the same structure.
A first connecting piece and a second connecting piece are respectively arranged at the two transverse ends of the upper chord; a third connecting piece and a fourth connecting piece are respectively arranged at the two transverse ends of the lower chord; the first connecting piece, the second connecting piece, the third connecting piece and the fourth connecting piece have the same structure;
the first connecting piece is hinged in the first connecting end, the second connecting piece is hinged in the third connecting end, the third connecting piece is hinged in the second connecting end, and the fourth connecting piece is hinged in the fourth connecting end.
The first connecting end comprises a pair of transverse stiffening ribs fixed on the inner side of the left non-energy dissipation beam section, a pair of vertical stiffening ribs are arranged between the transverse stiffening ribs, and the vertical stiffening ribs are arranged in parallel and oppositely; and the vertical stiffening ribs are provided with energy dissipation beam section mounting holes.
The invention also protects the SMA friction composite damper.
Compared with the prior art, the invention has the following technical effects:
the connecting beam with the SMA friction composite damper adopts the first SMA friction composite damper, the second SMA friction composite damper, the third SMA friction composite damper and the fourth SMA friction composite damper, and can realize self-repair in an earthquake, namely, the energy consumption capability of the connecting beam is improved, and the residual displacement of the connecting beam after the earthquake is reduced.
In the connecting beam with the SMA friction composite damper, the upper chord and the lower chord are hinged with the left non-energy dissipation beam section and the right non-energy dissipation beam section, so that the energy dissipation component can deform, and the axial elongation effect caused by the swinging of the connecting beam in the connecting beam is eliminated.
(III) in the coupling beam with the SMA friction composite dampers, the first SMA friction composite dampers, the second SMA friction composite dampers, the third SMA friction composite dampers and the fourth SMA friction composite dampers are arranged in a rhombic shape at four corners, so that the dampers are reduced in size and weight, and further can be conveniently disassembled at a later stage, the repair time is shortened, and the economy is improved.
(IV) all the parts of the connecting beam with the SMA friction composite damper can be prefabricated in a factory, the installation is convenient, and the SMA friction composite damper is hinged with the upper chord and the lower chord in a connecting mode, so that the connecting beam is convenient to install and disassemble after an earthquake. The coupling beam is used in a high-rise shear wall structure, so that the post-earthquake recovery capability of the shear wall structure can be improved, the toughness of the shear wall is enhanced, and the coupling beam has a wide application prospect.
Drawings
Fig. 1 is a schematic overall structure diagram of an attachment beam with an SMA friction composite damper.
FIG. 2 is a schematic structural diagram of an SMA friction composite damper.
FIG. 3 is a cross-sectional view A-A of an attachment beam with an SMA friction composite damper.
FIG. 4 is a front view of the upper chord.
Fig. 5 is an elevation view of the first connection tip.
Fig. 6 is a side view of the first connection tip.
FIG. 7A is a schematic view of the SMA friction composite damper in an unstressed state.
FIG. 7B is a schematic diagram of the SMA friction composite damper in a tensioned state.
FIG. 7C is a schematic view of the SMA friction composite damper in a compressed state.
FIG. 8 is a schematic view of the deformation under force of an attachment beam with an SMA friction composite damper.
The meaning of the individual reference symbols in the figures is: 1-left non-energy-dissipating beam section, 2-right non-energy-dissipating beam section, 3-upper chord, 4-lower chord, 5-first SMA friction composite damper, 6-second SMA friction composite damper, 7-third SMA friction composite damper, 8-fourth SMA friction composite damper, 9-first hinge, 10-second hinge, 11-third hinge, 12-fourth hinge, 13-fifth hinge, 14-sixth hinge, 15-first ear plate, 16-second ear plate, 17-third ear plate, 18-fourth ear plate, 19-fifth ear plate, 20-sixth ear plate, 21-seventh ear plate, 22-eighth ear plate, 23-first connection end, 24-second connection end, 25-third connection end, 26-a fourth connecting terminal, 27-a first connecting piece, 28-a second connecting piece, 29-a third connecting piece, 30-a fourth connecting piece;
501-a first friction steel plate, 502-a second friction steel plate, 503-a strip bolt hole, 504-a high-strength bolt, 505-a first end plate, 506-a second end plate, 507-a first square steel pipe, 508-a second square steel pipe, 509-a first SMA rod and 510-a second SMA rod;
2301-transverse stiffeners, 2302-vertical stiffeners, 2303-energy dissipating beam section mounting holes.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The shape memory alloy, SMA, is a new alloy material with excellent characteristics of shape memory effect, superelasticity, high damping, corrosion resistance, biocompatibility and the like. The invention provides a connecting beam with an SMA friction composite damper, wherein an SMA rod of the SMA friction composite damper and the friction damper in the connecting beam work cooperatively, so that the energy consumption capability of the connecting beam can be increased, and the residual displacement of the connecting beam can be reduced.
All parts in the present invention are those known in the art, unless otherwise specified.
SMA refers to shape memory alloys.
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Example 1:
the embodiment discloses an SMA friction composite damper, as shown in FIG. 2, comprising a first friction steel plate 501 and a second friction steel plate 502; the second friction steel plate 502 is provided with a plurality of strip-shaped bolt holes 503, high-strength bolts 504 are movably arranged in the strip-shaped bolt holes 503, and the high-strength bolts 504 are fixedly arranged on the first friction steel plate 501; the first friction steel plate 501 and the second friction steel plate 502 are connected through a long-strip-shaped bolt hole 503 and a high-strength bolt 504, and the first friction steel plate 501 and the second friction steel plate 502 can move relatively;
the first friction steel plate 501 is movably sleeved with a first end plate 505 close to the outside, and the second friction steel plate 502 is movably sleeved with a second end plate 506; a first square steel pipe 507 and a second square steel pipe 508 are arranged between the first end plate 505 and the second end plate 506, and the first square steel pipe 507 and the second square steel pipe 508 are arranged in parallel and oppositely;
one end of the first square steel pipe 507 is fixed on the first friction steel plate 501, and the other end of the first square steel pipe is close to the second end plate 506 and is not fixed; one end of the second square steel pipe 508 is close to the first end plate 505 and is not fixed, and the other end is fixed on the second friction steel plate 502;
a first SMA rod 509 is arranged in the first square steel pipe 507, and two ends of the first SMA rod 509 are fixedly mounted on the first end plate 505 and the second end plate 506 respectively; a second SMA rod 510 is arranged in the second square steel tube 508, and two ends of the second SMA rod 510 are respectively fixedly mounted on the first end plate 505 and the second end plate 506.
Example 2:
the embodiment discloses a connecting beam with an SMA friction composite damper, which adopts the SMA friction composite damper in embodiment 1, and as shown in fig. 1 to 8, the connecting beam comprises a left non-energy-dissipating beam section 1 and a right non-energy-dissipating beam section 2 which are oppositely arranged, an upper chord 3 and a lower chord 4 are hinged between the left non-energy-dissipating beam section 1 and the right non-energy-dissipating beam section 2, and the upper chord 3 and the lower chord 4 are oppositely arranged in parallel and along the transverse direction;
the inner side of the left non-energy dissipation beam section 1 is hinged with one end of a first SMA friction composite damper 5, the other end of the first SMA friction composite damper 5 is hinged on the inner side of the upper chord 3, the inner side of the upper chord 3 is also hinged with one end of a second SMA friction composite damper 6, the other end of the second SMA friction composite damper 6 is hinged on the inner side of the right non-energy dissipation beam section 2, the inner side of the right non-energy dissipation beam section 2 is also hinged with one end of a third SMA friction composite damper 7, the other end of the third SMA friction composite damper 7 is hinged on the inner side of the lower chord 4, the inner side of the lower chord 4 is also hinged with one end of a fourth SMA friction composite damper 8, and the other end of the fourth friction composite damper 8 is hinged on the inner side of the left non-energy dissipation beam section 1;
the first SMA friction composite damper 5, the second SMA friction composite damper 6, the third SMA friction composite damper 7 and the fourth SMA friction composite damper 8 have the same structure;
the first SMA friction composite damper 5 comprises a first friction steel plate 501 hinged on the inner side of the left non-energy dissipation beam section 1 and a second friction steel plate 502 hinged on the inner side of the upper chord 3; the second friction steel plate 502 is provided with a plurality of strip-shaped bolt holes 503, high-strength bolts 504 are movably arranged in the strip-shaped bolt holes 503, and the high-strength bolts 504 are fixedly arranged on the first friction steel plate 501; the first friction steel plate 501 and the second friction steel plate 502 are connected through a long-strip-shaped bolt hole 503 and a high-strength bolt 504, and the first friction steel plate 501 and the second friction steel plate 502 can move relatively;
the first friction steel plate 501 is movably sleeved with a first end plate 505 close to the outside, and the second friction steel plate 502 is movably sleeved with a second end plate 506; a first square steel pipe 507 and a second square steel pipe 508 are arranged between the first end plate 505 and the second end plate 506, and the first square steel pipe 507 and the second square steel pipe 508 are arranged in parallel and oppositely;
one end of the first square steel pipe 507 is fixed on the first friction steel plate 501, and the other end of the first square steel pipe 507 is close to the second end plate 506 and is not fixed; one end of the second square steel pipe 508 is close to the first end plate 505 and is not fixed, and the other end of the second square steel pipe 508 is fixed on the second friction steel plate 502;
a first SMA rod 509 is arranged in the first square steel pipe 507, and two ends of the first SMA rod 509 are fixedly mounted on the first end plate 505 and the second end plate 506 respectively; a second SMA rod 510 is arranged in the second square steel tube 508, and two ends of the second SMA rod 510 are respectively fixedly mounted on the first end plate 505 and the second end plate 506.
In this embodiment, one end of the first steel pipe 507 is welded to the first friction steel plate 501, and the other end can move freely; one end of the second square steel pipe 508 is welded to the second friction steel plate 502, and the other end thereof is freely movable. The centers of the first end plate 505 and the second end plate 506 are both provided with square holes, and the square holes can freely slide on the first square steel tube 507 and the second square steel tube 508.
In this embodiment, the high tensile bolts 504 provide normal pressure to generate friction at the interface. When an earthquake occurs, the generated energy is consumed by the frictional force generated between the first friction steel plate 501 and the second friction steel plate 502. The first SMA friction composite damper 5, the second SMA friction composite damper 6, the third SMA friction composite damper 7 and the fourth SMA friction composite damper 8 are used as web members of the energy dissipation coupling beam to enter a plastic state, so that energy consumption and damage are concentrated on the four SMA friction composite dampers. The four SMA friction composite dampers are hinged with the upper chord 3 and the lower chord 4 to realize quick repair after the earthquake.
In this embodiment, the steel plate size and the steel strength of the first SMA friction composite damper 5, the second SMA friction composite damper 6, the third SMA friction composite damper 7, and the fourth SMA friction composite damper 8, the length of the elongated bolt hole 503, the pretightening force of the high-strength bolt 504, and other parameters may be changed according to specific design requirements, so as to achieve the optimal effect.
In this embodiment, the number of the elongated bolt holes 503 is three.
In this embodiment, the energy consumption of the first SMA friction composite damper 5, the second SMA friction composite damper 6, the third SMA friction composite damper 7 and the fourth SMA friction composite damper 8 is not limited to the friction between the first friction steel plate 501 and the second friction steel plate 502; other gaskets capable of increasing friction force, such as brass sheets, can be added between the first friction steel plate 501 and the second friction steel plate 502.
In this embodiment, the bearing capacity of the left non-energy-dissipating beam section 1 and the right non-energy-dissipating beam section 2 is greater than the bearing capacity provided by the first SMA friction composite damper 5, the second SMA friction composite damper 6, the third SMA friction composite damper 7 and the fourth SMA friction composite damper 8, so as to ensure that the left non-energy-dissipating beam section 1 and the right non-energy-dissipating beam section 2 maintain elasticity.
As a specific scheme of this embodiment, the first SMA friction composite damper 5, the second SMA friction composite damper 6, the third SMA friction composite damper 7, and the fourth SMA friction composite damper 8 are arranged in pairs, the first SMA friction composite damper 5 and the third SMA friction composite damper 7 are parallel to each other, and the second SMA friction composite damper 6 and the fourth SMA friction composite damper 8 are parallel to each other.
In this embodiment, first SMA friction composite damper 5, second SMA friction composite damper 6, third SMA friction composite damper 7 and fourth SMA friction composite damper 8 are the rhombus four corners and arrange, can reduce the attenuator size, alleviate attenuator weight, make things convenient for the later stage to dismantle, reduce repair time and cost.
As a specific scheme of this embodiment, a first hinge 9 is disposed at a middle position of the inner side of the left non-energy-dissipating beam segment 1; a second hinge part 10 and a third hinge part 11 are sequentially arranged in the middle of the inner side of the upper chord 3 from left to right; a fourth hinged part 12 is arranged at the middle position of the inner side of the right non-energy dissipation beam section 2; the middle position of the inner side of the lower chord 4 is provided with a fifth hinge 13 and a sixth hinge 14 from left to right in sequence.
As a specific solution of this embodiment, a first ear plate 15 and a second ear plate 16 are respectively disposed at two ends of the first SMA friction composite damper 5; a third lug plate 17 and a fourth lug plate 18 are respectively arranged at two ends of the second SMA friction composite damper 6; a fifth lug plate 19 and a sixth lug plate 20 are respectively arranged at two ends of the third SMA friction composite damper 7; a seventh lug plate 21 and an eighth lug plate 22 are respectively arranged at two ends of the fourth SMA friction composite damper 8;
the first lug 15 is articulated in the upper half of the first articulation 9, the second lug 16 is articulated in the second articulation 10, the third lug 17 is articulated in the third articulation 11, the fourth lug 18 is articulated in the upper half of the fourth articulation 12, the fifth lug 19 is articulated in the lower half of the fourth articulation 12, the sixth lug 20 is articulated in the sixth articulation 14, the seventh lug 21 is articulated in the fifth articulation 13 and the eighth lug 22 is in the lower half of the first articulation 9.
In this embodiment, the sizes of the first hinge 9, the second hinge 10, the third hinge 11, the fourth hinge 12, the fifth hinge 13, and the sixth hinge 14 are required to ensure that the cross section of the four-corner connecting beam always keeps elasticity when the four-corner connecting beam normally works.
As a specific scheme of this embodiment, a first connection end 23 is arranged at the top of the inner side of the left non-energy-dissipating beam section 1, and a second connection end 24 is arranged at the bottom of the inner side of the left non-energy-dissipating beam section 1; the top of the inner side of the right non-energy dissipation beam section 2 is provided with a third connecting end 25, and the bottom of the inner side of the right non-energy dissipation beam section 2 is provided with a fourth connecting end 26; the first connecting terminal 23, the second connecting terminal 24, the third connecting terminal 25 and the fourth connecting terminal 26 are arranged opposite to each other in pairs and have the same structure.
As a specific solution of this embodiment, the two ends of the upper chord 3 in the transverse direction are respectively provided with a first connecting piece 27 and a second connecting piece 28; the transverse two ends of the lower chord 4 are respectively provided with a third connecting piece 29 and a fourth connecting piece 30; the first connecting piece 27, the second connecting piece 28, the third connecting piece 29 and the fourth connecting piece 30 are identical in structure;
the first connecting element 27 is articulated in the first connecting end 23, the second connecting element 28 is articulated in the third connecting end 25, the third connecting element 29 is articulated in the second connecting end 24 and the fourth connecting element 30 is articulated in the fourth connecting end 26.
As a specific solution of this embodiment, the first connection end 23 includes a pair of transverse stiffeners 2301 fixed on the inner side of the left non-energy-dissipating beam section 1, a pair of vertical stiffeners 2302 are arranged between the pair of transverse stiffeners 2301, and the vertical stiffeners 2302 are arranged in parallel and opposite to each other; and the vertical stiffening rib 2302 is provided with an energy dissipation beam section installation hole 2303.
In this embodiment, the first connecting end 23, the second connecting end 24, the third connecting end 25 and the fourth connecting end 26 are dimensioned to ensure that the sections thereof always maintain an elastic state, so as to connect the chord member with the non-energy dissipating beam section.
The working principle of the connecting beam with the SMA friction composite damper is as follows:
the energy dissipation and self-repairing of the connecting beam mainly depend on a first SMA friction composite damper 5, a second SMA friction composite damper 6, a third SMA friction composite damper 7 and a fourth SMA friction composite damper 8. Energy consumption components of the SMA friction composite damper are a first friction steel plate 501 and a second friction steel plate 502; the self-resetting components of the SMA friction composite damper are a first square steel pipe 507, a second square steel pipe 508, a first SMA rod 509 and a second SMA rod 510.
When the SMA friction composite damper is pulled, one end of the first square steel pipe 507 moves along with the first friction steel plate 501, and meanwhile, the first end plate 505 is pushed to move; the other end of the second square steel tube 508 follows the second friction steel plate 502 and pushes the second end plate 506 to move, so that the distance between the first end plate 505 and the second end plate 506 is lengthened, and further the first SMA rod 509 and the second SMA rod 510 are lengthened.
When the SMA friction composite damper is pressed, one end of the first square steel pipe 507 moves along with the first friction steel plate 501, and meanwhile, the second end plate 506 is pushed to move; the other end of the second square steel tube 508 follows the second friction steel plate 502 and pushes the first end plate 505 to move, so that the distance between the first end plate 505 and the second end plate 506 is lengthened, and further the first SMA rod 509 and the second SMA rod 510 are lengthened.
Thus, whether the SMA friction composite damper is in tension or compression, the first SMA rod 509 and the second SMA rod 510 are in an extended state, i.e., the first SMA rod 509 and the second SMA rod 510 are able to continuously generate a restoring force, reducing the residual displacement of the SMA friction composite damper.
As shown in fig. 8, when an earthquake occurs, the left non-energy-dissipating beam segment 1, the right non-energy-dissipating beam segment 2, the upper chord 3, the lower chord 4, the first hinge 9, the second hinge 10, the third hinge 11, the fourth hinge 12, the fifth hinge 13, and the sixth hinge 14 all maintain an elastic state, and the first SMA friction composite damper 5, the second SMA friction composite damper 6, the third SMA friction composite damper 7, and the fourth SMA friction composite damper 8 all enter a plastic state.
The connecting beam deforms under the action of an earthquake, the first SMA friction composite damper 5 and the third SMA friction composite damper 7 stretch in a tensile mode, the second SMA friction composite damper 6 and the fourth SMA friction composite damper 8 shorten in a compression mode, energy generated by friction force generated between the first friction steel plate 501 and the second friction steel plate 502 is consumed, the high-strength bolt 504 provides normal pressure to generate friction force on a contact surface, and the first SMA rod 509 and the second SMA rod 510 can continuously generate restoring force to reduce residual displacement of the SMA friction composite dampers.
Claims (8)
1. A coupling beam with an SMA friction composite damper comprises a left non-energy dissipation beam section (1) and a right non-energy dissipation beam section (2) which are oppositely arranged, and is characterized in that an upper chord (3) and a lower chord (4) are hinged between the left non-energy dissipation beam section (1) and the right non-energy dissipation beam section (2), and the upper chord (3) and the lower chord (4) are oppositely arranged in parallel and transversely;
the inner side of the left non-energy dissipation beam section (1) is hinged with one end of a first SMA friction composite damper (5), the other end of the first SMA friction composite damper (5) is hinged to the inner side of the upper chord (3), the inner side of the upper chord (3) is hinged with one end of a second SMA friction composite damper (6), the other end of the second SMA friction composite damper (6) is hinged to the inner side of the right non-energy dissipation beam section (2), the inner side of the right non-energy dissipation beam section (2) is hinged with one end of a third SMA friction composite damper (7), the other end of the third SMA friction composite damper (7) is hinged to the inner side of the lower chord (4), the inner side of the lower chord (4) is hinged with one end of a fourth SMA friction composite damper (8), and the other end of the fourth SMA friction composite damper (8) is hinged to the inner side of the left non-energy dissipation beam section (1);
the first SMA friction composite damper (5), the second SMA friction composite damper (6), the third SMA friction composite damper (7) and the fourth SMA friction composite damper (8) have the same structure;
the first SMA friction composite damper (5) comprises a first friction steel plate (501) hinged on the inner side of the left non-energy-dissipation beam section (1) and a second friction steel plate (502) hinged on the inner side of the upper chord (3); the second friction steel plate (502) is provided with a plurality of strip-shaped bolt holes (503), high-strength bolts (504) are movably arranged in the strip-shaped bolt holes (503), and the high-strength bolts (504) are fixedly arranged on the first friction steel plate (501); the first friction steel plate (501) and the second friction steel plate (502) are connected through a long-strip-shaped bolt hole (503) and a high-strength bolt (504), and the first friction steel plate (501) and the second friction steel plate (502) can move relatively;
a first end plate (505) is movably sleeved on the first friction steel plate (501) close to the outside, and a second end plate (506) is movably sleeved on the second friction steel plate (502) outside; a first square steel pipe (507) and a second square steel pipe (508) are arranged between the first end plate (505) and the second end plate (506), and the first square steel pipe (507) and the second square steel pipe (508) are arranged in parallel and oppositely;
one end of the first square steel pipe (507) is fixed on the first friction steel plate (501), and the other end of the first square steel pipe (507) is close to the second end plate (506) and is not fixed; one end of the second square steel pipe (508) is close to the first end plate (505) and is not fixed, and the other end of the second square steel pipe (508) is fixed on the second friction steel plate (502);
a first SMA rod (509) is arranged in the first square steel pipe (507), and two ends of the first SMA rod (509) are fixedly arranged on a first end plate (505) and a second end plate (506) respectively; and a second SMA rod (510) is arranged in the second square steel pipe (508), and two ends of the second SMA rod (510) are fixedly arranged on the first end plate (505) and the second end plate (506) respectively.
2. A coupling beam with SMA friction composite dampers according to claim 1, wherein the first SMA friction composite damper (5), the second SMA friction composite damper (6), the third SMA friction composite damper (7) and the fourth SMA friction composite damper (8) are arranged in pairs, the first SMA friction composite damper (5) and the third SMA friction composite damper (7) are parallel to each other, and the second SMA friction composite damper (6) and the fourth SMA friction composite damper (8) are parallel to each other.
3. A coupling beam with SMA friction composite damper according to claim 1, characterized in that a first hinge (9) is provided at the middle position of the inner side of the left non-energy-dissipating beam section (1); a second hinge piece (10) and a third hinge piece (11) are sequentially arranged in the middle of the inner side of the upper chord (3) from left to right; a fourth hinged part (12) is arranged in the middle of the inner side of the right non-energy dissipation beam section (2); and a fifth hinge part (13) and a sixth hinge part (14) are sequentially arranged in the middle of the inner side of the lower chord (4) from left to right.
4. A coupling beam with SMA friction composite damper according to claim 3, wherein the first SMA friction composite damper (5) is provided with a first ear plate (15) and a second ear plate (16) at both ends thereof; a third lug plate (17) and a fourth lug plate (18) are respectively arranged at two ends of the second SMA friction composite damper (6); a fifth lug plate (19) and a sixth lug plate (20) are respectively arranged at two ends of the third SMA friction composite damper (7); a seventh lug plate (21) and an eighth lug plate (22) are respectively arranged at two ends of the fourth SMA friction composite damper (8);
the first ear plate (15) is hinged in the upper half part of the first hinge piece (9), the second ear plate (16) is hinged in the second hinge piece (10), the third ear plate (17) is hinged in the third hinge piece (11), the fourth ear plate (18) is hinged in the upper half part of the fourth hinge piece (12), the fifth ear plate (19) is hinged in the lower half part of the fourth hinge piece (12), the sixth ear plate (20) is hinged in the sixth hinge piece (14), the seventh ear plate (21) is hinged in the fifth hinge piece (13), and the eighth ear plate (22) is in the lower half part of the first hinge piece (9).
5. A connecting beam with an SMA friction composite damper according to claim 1, characterized in that the top of the inner side of the left non-energy-dissipating beam section (1) is provided with a first connecting end (23), and the bottom of the inner side of the left non-energy-dissipating beam section (1) is provided with a second connecting end (24); the top of the inner side of the right non-energy dissipation beam section (2) is provided with a third connecting end (25), and the bottom of the inner side of the right non-energy dissipation beam section (2) is provided with a fourth connecting end (26); the first connecting end (23), the second connecting end (24), the third connecting end (25) and the fourth connecting end (26) are arranged oppositely in pairs and have the same structure.
6. The coupling beam with the SMA friction composite damper according to claim 5, wherein the upper chord (3) is provided at its both lateral ends with a first connecting member (27) and a second connecting member (28), respectively; a third connecting piece (29) and a fourth connecting piece (30) are respectively arranged at the two transverse ends of the lower chord (4); the first connecting piece (27), the second connecting piece (28), the third connecting piece (29) and the fourth connecting piece (30) have the same structure;
the first connecting piece (27) is hinged in the first connecting end (23), the second connecting piece (28) is hinged in the third connecting end (25), the third connecting piece (29) is hinged in the second connecting end (24), and the fourth connecting piece (30) is hinged in the fourth connecting end (26).
7. A coupling beam with SMA friction composite dampers according to claim 5, wherein the first connecting end (23) comprises a pair of transverse stiffeners (2301) fixed on the inner side of the left non-energy dissipating beam section (1), a pair of vertical stiffeners (2302) are arranged between the transverse stiffeners (2301), the vertical stiffeners (2302) are arranged in parallel and opposite; and energy dissipation beam section mounting holes (2303) are formed in the vertical stiffening ribs (2302).
8. An SMA friction composite damper, comprising a first friction steel plate (501) and a second friction steel plate (502); the second friction steel plate (502) is provided with a plurality of strip-shaped bolt holes (503), high-strength bolts (504) are movably arranged in the strip-shaped bolt holes (503), and the high-strength bolts (504) are fixedly arranged on the first friction steel plate (501); the first friction steel plate (501) and the second friction steel plate (502) are connected through a long-strip-shaped bolt hole (503) and a high-strength bolt (504), and the first friction steel plate (501) and the second friction steel plate (502) can move relatively;
a first end plate (505) is movably sleeved on the first friction steel plate (501) close to the outside, and a second end plate (506) is movably sleeved on the second friction steel plate (502) outside; a first square steel pipe (507) and a second square steel pipe (508) are arranged between the first end plate (505) and the second end plate (506), and the first square steel pipe (507) and the second square steel pipe (508) are arranged in parallel and oppositely;
one end of the first square steel pipe (507) is fixed on the first friction steel plate (501), and the other end of the first square steel pipe is close to the second end plate (506) and is not fixed; one end of the second square steel pipe (508) is close to the first end plate (505) and is not fixed, and the other end of the second square steel pipe is fixed on the second friction steel plate (502);
a first SMA rod (509) is arranged in the first square steel pipe (507), and two ends of the first SMA rod (509) are fixedly arranged on a first end plate (505) and a second end plate (506) respectively; and a second SMA rod (510) is arranged in the second square steel pipe (508), and two ends of the second SMA rod (510) are fixedly arranged on the first end plate (505) and the second end plate (506) respectively.
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| CN113175117A (en) * | 2021-05-11 | 2021-07-27 | 四川大学 | Truss type replaceable energy dissipation connecting beam with buckling restrained brace |
| CN115162509A (en) * | 2022-08-04 | 2022-10-11 | 江西瓯麦科技有限公司 | Heavy-load-resisting side force supporting frame for supporting rhombic grids |
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