CN108824174A - A kind of assembled steel reinforced concrete arch-type bridge prefabricated stand column shock-resistant node - Google Patents
A kind of assembled steel reinforced concrete arch-type bridge prefabricated stand column shock-resistant node Download PDFInfo
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- CN108824174A CN108824174A CN201810962912.5A CN201810962912A CN108824174A CN 108824174 A CN108824174 A CN 108824174A CN 201810962912 A CN201810962912 A CN 201810962912A CN 108824174 A CN108824174 A CN 108824174A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 18
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 18
- 239000010959 steel Substances 0.000 title claims abstract description 18
- 230000035939 shock Effects 0.000 title claims abstract description 12
- 230000002787 reinforcement Effects 0.000 claims abstract description 71
- 238000004873 anchoring Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 24
- 239000004567 concrete Substances 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 15
- 238000010276 construction Methods 0.000 abstract description 11
- 238000010008 shearing Methods 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 20
- 238000010586 diagram Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 210000003205 muscle Anatomy 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of assembled steel reinforced concrete arch-type bridge prefabricated stand column shock-resistant nodes, including prefabricated stand column and cast-in-place cushion cap, screw thread bar reinforcement is embedded in cast-in-place cushion cap, screw thread bar reinforcement is anchored in prefabricated stand column to which prefabricated stand column and cast-in-place cushion cap are connected to become entirety, and a circle water vapor seal circle is equipped at prefabricated stand column bottom outer-edge and the contact surface of cast-in-place cushion cap；Prefabricated stand column bends up to be formed in plastic hinge section oblique bends up intersection shear reinforcement；Screw thread bar reinforcement is embedded on cast-in-place cushion cap, screw thread bar reinforcement passes through screw cap anchoring after the anchor hole of prefabricated stand column.The principal tensile stress that bends up longitudinal reinforcement energy resist torque and shearing jointly generate of the node in plastic hinge section, the formation and development in crack are effectively limited when an earthquake occurs, the anchoring process of prestressing force screw thread bar reinforcement substitutes original construction method, can be to avoid main reinforcement through the weak link that joint cores are welded to connect and are likely to form.
Description
Technical field
The present invention relates to bridge earthquake resistance technical fields, and in particular to a kind of assembled steel reinforced concrete arch-type bridge prefabricated stand column is anti-
Shake node.
Background technique
The construction of assembled steel reinforced concrete arch-type bridge prefabricated stand column mainly includes the prefabricated and live installation of component.Its
Have many advantages, such as that the construction period is short, construction technology is mature and easy for construction, in highway bridge, especially highway bridge in mountainous area
It is widely used.
It in earthquake prone areas and provides fortification against earthquakes mountain highway many places suitable for building assembled steel reinforced concrete arch-type bridge
More demanding area.Force transmission parts of the node as structure, play the role of the transmitting of power between component under geological process, are knots
The core part that structure destroys, it is related to the safety and stability of total.Under geological process, once node occurs to break
It is bad, often cause destructive consequence, so that not can guarantee structure meets " small earthquakes are not bad, medium ones can be repaired, and large ones cannot fall "
It provides fortification against earthquakes related request.When an earthquake occurs, the shearing of joint cores is very big, it is easy to brittle failure by shear occur.Together
When, its essence of geological process is to apply a kind of cyclic reverse loading to structure, and Bond Degradation phenomenon can occur for reinforcing bar in the process, from
And the anchoring of reinforcing bar is made to be weakened or even destroy, make intensity, the energy-dissipating property decline of position of joints.
Built arch bridge is found after the disease in all previous earthquake is investigated, under geological process, the node of bridge
Bit comparison is easy to appear disease, and the position of joints of especially field erected prefabricated stand column and main arch is easier to occur more tight
The disease of weight.Research to position of joints anti-seismic performance, be earliest since field of house buildings frame joint, through it is too long when
Between largely study, achieve a large amount of achievement in its field.However, in the node and house architectural structure of bridge frame section
There are larger differences for point, cannot directly apply the Aseismic Design of frame joint in house architectural structure.Also, these researchs are most
It is relatively fewer to the research of prefabricated node for integral cast-in-situ node.In science of bridge building field, what China promulgated《Urban Bridge
Earthquake resistant design code》,《Highway bridge earthquake resistant code》And《Highway reinforced concrete and prestressed concrete bridge contain design rule
Model》In, although being made that relevant requirement to node, a kind of general design method is not provided clearly, more
Related request is not proposed for assembling type node.
According to existing research achievement, the design of the assembled arch bridge prefabricated stand column node used now, node is relatively thin
It is weak, be not inconsistent with the mainstream seismic Concept of " strong column and weak beam rigid joint ", it is therefore necessary to propose it is a kind of have good anti-seismic performance and
Assembled column node easy for construction.
Summary of the invention
The present invention to solve the above-mentioned problems, devises a kind of assembled steel reinforced concrete arch-type bridge prefabricated stand column antidetonation section
Point, the shock-resistant node can increase the shear resistance of prefabricated stand column node section, it is ensured that column forms plastic hinge before destroying, and does not occur
Failure by shear；The principal tensile stress for bending up longitudinal reinforcement energy resist torque and shearing and generating jointly in areas of plasticity hinge, is sending out
Radix Rehmanniae effectively limits the formation and development in crack when shaking；It is applied using the anchoring process substitution of prestressing force screw thread bar reinforcement is original
Work method can avoid simultaneously to avoid main reinforcement through the weak link that joint cores are welded to connect and are likely to form
Concrete secondary pours the weak link that may be formed on faying face, while this method is easy for construction.
In order to achieve the above technical purposes, reach above-mentioned technical effect, the present invention is achieved by the following technical solutions：
A kind of assembled steel reinforced concrete arch-type bridge prefabricated stand column shock-resistant node, which is characterized in that including prefabricated stand column and now
Pour cushion cap, be embedded with screw thread bar reinforcement in cast-in-place cushion cap, screw thread bar reinforcement be anchored in prefabricated stand column to by prefabricated stand column with
Cast-in-place cushion cap is connected to become entirety, and a circle water vapor seal circle is equipped at prefabricated stand column bottom outer-edge and the contact surface of cast-in-place cushion cap；
The prefabricated stand column is reinforced concrete structure, and prefabricated stand column is from the top down successively by supporting section, plastic hinge region
Section and anchor connection section composition, plastic hinge section direction across bridge pour groove, the anchor connection Duan Shunqiao of prefabricated stand column bottom after being equipped with
To isosceles trapezoid enlarged base is diffuseed to form outward, it is provided with anchor hole in enlarged base, partial pressing's spiral steel is embedded at anchor hole
Muscle, the elongated longitudinal reinforcement of prefabricated stand column, which passes through to bend up to be formed in plastic hinge section after supporting section, oblique bends up intersection shear reinforcement
And formed and be closed in enlarged base bottom, plastic hinge section is equipped with reinforcing bar, and the both ends of reinforcing bar are anchored in support respectively
Pars infrasegmentalis and anchor connection section top；
The cast-in-place cushion cap is monolithic reinforced concrete structure, is embedded with screw thread bar reinforcement on cast-in-place cushion cap, screw thread is thick
The position of reinforcing bar is corresponding with the anchor hole position of prefabricated stand column, and screw thread bar reinforcement passes through nut anchor after the anchor hole of prefabricated stand column
Gu being poured after the prefabricated stand column after nut is fixed and having poured fiber concrete in groove.
Further, 4 elongated longitudinal reinforcements are equipped in the prefabricated stand column, plastic hinge section is furnished with 4 reinforcement steel
Muscle and reinforcing bar are set to the outside of elongated longitudinal reinforcement, and the hoop that spacing is 200mm is banded on the elongated reinforcing bar of supporting section
Muscle is banded with the stirrup that spacing is 100mm on the reinforcing bar of plastic hinge section, and the base angle of the enlarged base of prefabricated stand column is
45 °, the anchor holes of 4 perforations are provided in anchor connection section, anchor hole is set to the inside on 4 sides of anchor connection section.
Further, the elongated longitudinal reinforcement and reinforcing bar select HRP335 or HRB400 steel bar and diameter is not
Less than 20mm, stirrup selects HPB235 steel bar and diameter is not less than 12mm.
The beneficial effects of the invention are as follows：(1) by encryption stirrup, the shearing resistance energy of prefabricated stand column node section can be reinforced
Power, it is ensured that column forms plastic hinge before destroying, and failure by shear does not occur；
(2) principal tensile stress for bending up longitudinal reinforcement energy resist torque and shearing and generating jointly in plastic hinge section,
The formation and development in crack are effectively limited when an earthquake occurs；
(3) original construction method is substituted using the anchoring process of prestressing force screw thread bar reinforcement, can be being passed through to avoid main reinforcement
The weak link that joint cores are welded to connect and are likely to form is worn, while avoiding concrete secondary from pouring to combine
The weak link formed on face, while this method is easy for construction.
Detailed description of the invention：
Fig. 1 is former design prefabricated stand column node structure schematic diagram；
Fig. 2 is that original designs suitable bridge to prefabricated stand column intra-node arrangement of reinforcement；
Fig. 3 is former design direction across bridge prefabricated stand column intra-node arrangement of reinforcement；
Fig. 4 is prefabricated stand column node structure schematic diagram of the present invention
Fig. 5 be the present invention along bridge to prefabricated stand column intra-node arrangement of reinforcement；
Fig. 6 is the overlooking structure diagram of enlarged base of the suitable bridge to prefabricated stand column；
Fig. 7 is invention direction across bridge prefabricated stand column intra-node arrangement of reinforcement；
Fig. 8 is the overlooking structure diagram of the enlarged base of direction across bridge prefabricated stand column of the present invention；
Fig. 9 is former design prefabricated stand column node shock test section arrangement schematic diagram；
Figure 10 is prefabricated stand column node shock test section of the present invention arrangement schematic diagram；
Figure 11 is the sensor layout schematic diagram of former design and the present invention in same cross-sectional；
Figure 12 is skeleton curve comparison diagram of the former design with column node of the invention under the test of identical earthquake-resistant condition；
Figure 13 is former design and nodal moment-rotation curve under the conditions of column node of the present invention online identical shock test
Comparison diagram.
In attached drawing, parts list represented by the reference numerals are as follows：
1- prefabricated stand column, pours groove after 11-, the elongated longitudinal reinforcement of 101-, 102- stirrup, 103- reinforcing bar, and 104- is handed over
Shear reinforcement is pitched, 105- plastic hinge section pours fiber concrete, 111- anchor hole after 106-；The cast-in-place cushion cap of 2-, 21- screw thread crude steel
Muscle；3- nut, 31- partial pressing spiral reinforcement；4- water vapor seal circle.
Specific embodiment:
A specific embodiment of the invention is as follows：
Embodiment 1
(1) pre-buried screw thread bar reinforcement
Reinforced concrete arch bridge after the construction for completing main arch ring, pours cast-in-place cushion cap 2, corresponding every in cast-in-place cushion cap 2
The pre-buried 4 screw thread bar reinforcements 21 of root post, pre-buried position is as shown in attached drawing 4 and attached drawing 5, prefabricated stand column in corresponding step (6)
111 position of anchor hole.Screw thread bar reinforcement 21 uses HRP335 or HRB400, and bar gauge is determined according to Force Calculation, but diameter is not
It obtains and is less than 32mm.
(2) computational plasticity cuts with scissors segment height
The different column in position in different arch bridge designs or in same arch bridge, due to sectional dimension, strut length with
And arrangement of reinforcement etc. is not quite similar, plastic hinge section 105 is all different.Firstly the need of the modeling for going out different prefabricated stand columns according to proper calculation
Property hinge section 105 it is high.
(3) longitudinal reinforcement rises curved
In the plastic hinge section 105 of prefabricated stand column, the elongated longitudinal reinforcement 101 of prefabricated stand column 1 is bent up, is formed oblique curved
It rises and intersects shear reinforcement 104.As shown in Fig. 4, the suitable bridge of column to or the opposite bent-up bar in direction across bridge two sides, prefabricated vertical
Closure is formed on 1 bottom of column.Elongated longitudinal reinforcement 101 uses HRP335 or HRB400, and bar gauge is determined according to Force Calculation, but
Bar diameter cannot be less than 20mm.
(4) increase longitudinal reinforcement
As shown in attached drawing 5 and attached drawing 6, since the elongated longitudinal reinforcement 101 of former prefabricated stand column 1 bends up shape in plastic hinge section
At shear reinforcement 104 is intersected, longitudinal reinforcement is reduced in the region.Therefore, reinforcing bar 103 need to be increased in the region, as replacing
For the elongated longitudinal reinforcement 101 of prefabricated stand column.The specification of reinforcing bar 103 is identical as elongated longitudinal reinforcement 101, and the upper end anchor
Gu length must not add the sum of the anchorage length of steel bar of specification defined lower than 105 height of plastic hinge section.
(5) stirrup is encrypted
As shown in attached drawing 7 and attached drawing 8, the stirrup 102 of prefabricated stand column generally uses HPB235, spacing 200mm.In order to add
Strong node shear resistance, needs to encrypt stirrup 102 in plastic hinge section 105,102 spacing of stirrup is adopted in the area
Use 100mm.102 diameter of stirrup cannot be less than 12mm.
(6) prefabricated stand column is anchored
1 joint structure of prefabricated stand column along bridge to and direction across bridge have certain difference.
In suitable bridge to as shown in Fig. 5,1 bottom of prefabricated stand column is extended to a certain range for 45 ° to outer, and anchor hole 111 is arranged
In enlarged base, pre-buried partial pressing's spiral reinforcement 31 at anchor hole 111.When prefabricated stand column 1 is installed, directly pass through nut 3
Application pre-applied force is tightened to be anchored.
In direction across bridge, as shown in Fig. 7, in 1 bottom of prefabricated stand column to contract a part, the setting of anchor hole 111 is being shunk
Prefabricated stand column two sides afterwards, pre-buried partial pressing's spiral reinforcement 31 at anchor hole 111 directly pass through spiral shell when installing prefabricated stand column 1
Cap 3 is tightened application pre-applied force and is anchored, and groove will be poured after prefabricated stand column by pouring fiber concrete 106 after using after the installation is completed
11 empty portions filling is full.And guarantee after pouring concrete surface it is smooth and smooth.
When carrying out prefabricated stand column 1 and the installation of cast-in-place cushion cap 2, needs that water vapor seal circle 4 is installed in two component faying faces, prevent
Steam, which enters, causes pre-buried screw thread bar reinforcement 21 to corrode.
Embodiment 2
It is verified caused by the present invention under the conditions of identical shock test by former design with the present invention in the present embodiment
Beneficial effect
The structure of former design node is as shown in attached drawing 1, attached drawing 2 and attached drawing 3：
(1) embedded bar
Reinforced concrete arch bridge after the construction for completing main arch ring, pours cast-in-place cushion cap, every corresponding in cast-in-place cushion cap
The pre-buried 8 first screw thread bar reinforcements of prefabricated stand column and 20 second screw thread bar reinforcements, specification are all the HRB335 that diameter is 20mm
Reinforcing bar.First screw thread bar reinforcement in step (3) with prefabricated stand column longitudinal reinforcement for being welded to connect, the first screw thread bar reinforcement
Reinforcing bar is anchored into as pouring concrete part rear in step (3).Pre-buried position is as shown in attached drawing 1, attached drawing 2 and attached drawing 3, the first spiral shell
Line bar reinforcement corresponds to prefabricated stand column longitudinal reinforcement position in step (2).
(2) prefabricated stand column
As shown in attached drawing 1, attached drawing 2 and attached drawing 3, prefabricated stand column longitudinal reinforcement specification is the HRB335 steel that diameter is 20mm
Muscle.Column bottom pours groove to contract after formation, longitudinal reinforcement pours inside grooves after extending to, when for step (3) installation
It is welded to connect with the embedded bar 205 of cushion cap.Prefabricated stand column stirrup specification is the HPB235 reinforcing bar that diameter is 8mm, spacing
Using 150mm.Prefabricated stand column longitudinal reinforcement pours groove and is encrypted with the second stirrup after running through, the second stirrup specification is diameter
The HPB235 reinforcing bar of 8mm.
(3) prefabricated stand column is anchored
Prefabricated stand column longitudinal reinforcement and cushion cap embedded bar are poured into fiber coagulation after carrying out site welding as shown in 207
Soil carries out maintenance posterior nodal point and completes.
Test main purpose is to verify the maximum load capacity and energy dissipation capacity of different designs method, using vertical in model
The pseudo-static experimental method that column capital applies horizontal direction shift reciprocately can satisfy requirement, and load deflection size 0mm starts, each
Circulation increase 2mm, be loaded into always component load-bearing ability start present downward trend until.
In loading procedure, the displacement of strain and test specimen to reinforcing bar, concrete is recorded, original design and this hair
Bright sensor arrangement position is respectively as shown in attached drawing 9 and attached drawing 10.On four testing sections shown in figure, such as 11 institute of attached drawing
Show, arranges strain measuring point in longitudinal reinforcement, stirrup and concrete surface respectively, while also arranging level on the section
The displacement meter in direction.
By logical comparison of test results, node of the invention achieves following effect in terms of anti-seismic performance：
(1) by original design and column node skeleton curve of the invention shown in comparison attached drawing 12 it is found that of the invention
Node has higher yield point, intensity and better energy dissipation capacity, has reacted when generation earthquake comes, the present invention can be more preferable
Absorption seismic energy, have better collapse resistant capacity.
(2) by original design and column nodal moment-rotation curve of the invention shown in comparison attached drawing 13 it is found that this hair
It is bright to undertake bigger moment of flexure in the case where same corner compared with former design, or can consider in same earthquake intensity
In the case of, deformation of the invention is smaller, can preferably protect stable structure, earthquake energy.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one implementation of the invention
In example or example.In the present specification, schematic expression of the above terms may not refer to the same embodiment or example.
Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples to close
Suitable mode combines.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification,
It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention
Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only
It is limited by claims and its full scope and equivalent.
Claims (3)
1. a kind of assembled steel reinforced concrete arch-type bridge prefabricated stand column shock-resistant node, which is characterized in that including prefabricated stand column and cast-in-place
Cushion cap, is embedded with screw thread bar reinforcement in cast-in-place cushion cap, and screw thread bar reinforcement is anchored in prefabricated stand column to by prefabricated stand column and existing
It pours cushion cap and is connected to become entirety, a circle water vapor seal circle is equipped at prefabricated stand column bottom outer-edge and the contact surface of cast-in-place cushion cap；
The prefabricated stand column be reinforced concrete structure, prefabricated stand column from the top down successively by supporting section, plastic hinge section and
Anchor connection section composition, plastic hinge section direction across bridge pour groove after being equipped with, the anchor connection Duan Shunqiao of prefabricated stand column bottom to
External diffusion forms isosceles trapezoid enlarged base, is provided with anchor hole in enlarged base, partial pressing's spiral reinforcement is embedded at anchor hole, in advance
The elongated longitudinal reinforcement of column processed pass through supporting section after plastic hinge section bend up to be formed it is oblique bend up intersect shear reinforcement and in
Closure is formed on enlarged base bottom, and plastic hinge section is equipped with reinforcing bar, and the both ends of reinforcing bar are anchored under supporting section respectively
Portion and anchor connection section top；
The cast-in-place cushion cap is monolithic reinforced concrete structure, is embedded with screw thread bar reinforcement, screw thread bar reinforcement on cast-in-place cushion cap
Position it is corresponding with the anchor hole position of prefabricated stand column, screw thread bar reinforcement passes through after the anchor hole of prefabricated stand column through screw cap anchoring, spiral shell
It is poured after prefabricated stand column after cap is fixed and has poured fiber concrete in groove.
2. a kind of assembled steel reinforced concrete arch-type bridge prefabricated stand column shock-resistant node according to claim 1, which is characterized in that
4 elongated longitudinal reinforcements are equipped in the prefabricated stand column, plastic hinge section is equipped with 4 reinforcing bars and reinforcing bar is set to
The outside of elongated longitudinal reinforcement is banded with the stirrup that spacing is 200mm, the reinforcement of plastic hinge section on the elongated reinforcing bar of supporting section
The stirrup that spacing is 100mm is banded on reinforcing bar, the base angle of the enlarged base of prefabricated stand column is 45 °, is provided with 4 in anchor connection section
The anchor hole of a perforation, anchor hole are set to the inside on 4 sides of anchor connection section.
3. a kind of assembled steel reinforced concrete arch-type bridge prefabricated stand column shock-resistant node according to claim 1, which is characterized in that
The elongated longitudinal reinforcement and reinforcing bar select HRP335 or HRB400 steel bar and diameter is not less than 20mm, and stirrup is selected
HPB235 steel bar and diameter are not less than 12mm.
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| CN201810962912.5A CN108824174B (en) | 2018-08-22 | 2018-08-22 | Prefabricated stand anti-seismic node of assembled reinforced concrete arch bridge |
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| CN201810962912.5A CN108824174B (en) | 2018-08-22 | 2018-08-22 | Prefabricated stand anti-seismic node of assembled reinforced concrete arch bridge |
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| CN108824174B CN108824174B (en) | 2024-01-30 |
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