CN114252218A - Test method for bending resistance bearing capacity of pier with steel-concrete mixed structure and counter-force loading system - Google Patents
Test method for bending resistance bearing capacity of pier with steel-concrete mixed structure and counter-force loading system Download PDFInfo
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- CN114252218A CN114252218A CN202111385518.8A CN202111385518A CN114252218A CN 114252218 A CN114252218 A CN 114252218A CN 202111385518 A CN202111385518 A CN 202111385518A CN 114252218 A CN114252218 A CN 114252218A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
Abstract
The invention relates to a test method and a counter-force loading system for bending resistance bearing capacity of a pier with a steel-concrete mixed structure, wherein the test method comprises the following steps: prefabricating and preparing each part of a loading device, and preparing a steel structure part; constructing an integral test component; arranging a bottom pad beam, and fixing a steel bearing platform above the bottom pad beam; hoisting, fixedly connecting to obtain a steel-concrete mixed structure pier integral test piece, arranging a profile steel distribution beam on the steel-concrete mixed structure pier integral test piece, arranging a support cushion block in a matching manner, and arranging a hydraulic jack between an upper distribution beam and a lower distribution beam of the profile steel distribution beam; and respectively anchoring two ends of the prestressed steel bundle on the upper distribution beam and the steel bearing platform through a prestressed anchorage device to form a counter-force loading system, and loading through a jack until the structure is damaged. Compared with the prior art, the bridge pier has the advantages of high prefabrication degree, convenient transportation of small-volume components, simple and safe assembly process and capability of being used for bridge piers with various structures such as single columns, double columns and the like.
Description
Technical Field
The invention relates to the field of bridge engineering, in particular to a test method of bending resistance bearing capacity of a pier with a steel-concrete mixed structure and a counter force loading system.
Background
At present, a static force loading test of the mixed structure pier is carried out by a steel structure reaction frame commonly, the reaction frame mainly comprises a cross beam, an upright post, a base, a lifting system, a hydraulic system and a cushion block, and the single bodies of the components have large volume and mass and are difficult to transport. After all components are transported to a field, the form of the reaction frame assembled by utilizing bolt connection is relatively fixed, the whole height needs to be changed by the bolt connection of the upright post and the cross beam, and the width cannot be changed, so that the defects of poor applicability and poor mobility are caused.
Meanwhile, the whole shape of the reaction frame is fixed, so that certain difficulty exists in the process of placing the test specimen into the reaction frame, and after the test specimen is placed into the reaction frame, the stand column, the cross beam and the base form a frame structure, so that the operation space is small, and the subsequent work of attaching a strain gauge, pulling a displacement meter and the like is not facilitated.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a test method and a reaction loading system for the bending resistance bearing capacity of a pier with a steel-concrete mixed structure, which have the advantages of high prefabrication degree, convenient transportation of small-volume components, simple and safe assembly process and capability of being used for piers with various structures such as single columns, double columns and the like.
The purpose of the invention can be realized by the following technical scheme:
the first purpose of the technical scheme is to protect a test method for the bending resistance bearing capacity of a pier with a steel-concrete mixed structure, which comprises the following steps:
s1: prefabricating and preparing each part of a loading device, and preparing a steel structure part in a pier test specimen of a steel-concrete mixed structure, wherein the loading device comprises a support cushion block, a profile steel distribution beam, a hydraulic jack, a prestressed steel bundle, an anchorage device, a steel bearing platform connecting piece, a steel bearing platform and a bottom pad beam;
s2: preparing a concrete bearing platform, a column and a steel-concrete bearing platform connecting piece, and constructing an integral test member;
s3: arranging a bottom pad beam, and fixing a steel bearing platform above the bottom pad beam;
s4: hoisting the integral test member on a steel bearing platform, mounting a steel structure part on the integral test member, and fixedly connecting to obtain a pier integral test piece with a steel-concrete mixed structure;
s5: arranging a profile steel distribution beam on the integral test piece of the pier with the steel-concrete mixed structure, arranging a support cushion block in a matching way, and arranging a hydraulic jack between an upper distribution beam and a lower distribution beam of the profile steel distribution beam;
s6: and respectively anchoring two ends of the prestressed steel bundle on the upper distribution beam and the steel bearing platform through a prestressed anchorage device to form a counter-force loading system, and loading through a jack until the structure is damaged.
Further, in S1, the steel structure part includes a steel cap beam, a steel bar, a bolt, and a nut.
Further, in S2, the process of constructing the integral test member includes:
and (3) binding the reinforcing steel bars of the upright post and the bearing platform in the pier with the mixed structure to form an inverted T-shaped reinforcing steel cage, placing the inverted T-shaped reinforcing steel cage in the steel-concrete bearing platform connecting piece, pouring the concrete bearing platform and the upright post by using the vertical template, removing the template after the concrete curing is finished, and forming an integral component by using the concrete bearing platform, the upright post and the steel-concrete bearing platform connecting piece.
Further, in S3, the process of setting the bottom pad beam is:
the bottom pad beam is placed on the ground at parallel intervals, the steel bearing platform is placed above the bottom pad beam and is vertically arranged in the length direction of the bottom pad beam and the steel bearing platform, then the bottom pad beam is moved to the position of the transverse partition plate of the steel bearing platform, and the bottom pad beam is fixedly connected with the steel bearing platform through bolts.
Further, S4 includes S4-1: hoisting the integral test component and placing the integral test component on the steel bearing platform, aligning the bolt holes of the bottom plate of the steel-concrete bearing platform connecting piece and the bolt holes of the top plate of the steel bearing platform, and screwing the bolts to enable the steel-concrete bearing platform connecting piece to be in anchoring connection with the steel bearing platform.
Further, S4 includes S4-2: the steel cover beam is hoisted to the position above the concrete upright column to be aligned and placed, the steel cover beam is fixedly connected to a whole test piece of the pier with the steel-concrete mixed structure, and the length direction of the steel cover beam is consistent with that of the steel bearing platform.
Further, S5 includes:
s5-1: placing the support cushion blocks at the positions of the partition plates of the steel bent cap top plate according to the requirement of a loading working condition;
s5-2: the structural steel distribution beam with the vertical stiffening ribs is divided into an upper part and a lower part, wherein the length direction of the lower distribution beam is parallel to the length direction of the steel cover beam and is arranged above the support cushion block, the center of the top plate of the lower distribution beam is provided with a gasket and an upper distribution beam, the top of the jack is provided with the gasket and the upper distribution beam in sequence, the length direction of the upper distribution beam is perpendicular to the length direction of the steel cover beam, the extension part of the length direction exceeding the width of the steel cover beam is provided with a round hole, and the aperture of the round hole is smaller than that of a prestressed anchor.
Further, in S6, one end of the prestressed anchorage device is anchored at a round hole at the top of the upper distribution beam, the prestressed beam penetrates through the round hole of the upper distribution beam and a notch of the flange at the outer side of the steel bearing platform, the other end of the prestressed anchorage device is anchored at a notch of the web stiffening rib of the steel bearing platform, and the whole test system forms a self-reaction force loading system.
Further, the test piece for the mixed structure pier test comprises a single column pier or a double column pier structure.
The second purpose of this technical scheme is to protect a reaction loading system that is used for steel-concrete mixed structure pier bending resistance bearing capacity to test, including last anchor end, prestressing steel bundle, fluid pressure type jack down, wherein specifically:
the upper anchoring end is arranged on an upper distribution beam of the static force loading test device;
the lower anchoring end is arranged on a steel bearing platform of the static force loading test device, and the steel-concrete mixed structure pier test piece is arranged between the steel bearing platform and a lower distribution beam of the static force loading test device;
two ends of the prestressed steel beam are respectively fixed at the upper anchoring end and the lower anchoring end;
the hydraulic jack is arranged between the upper distribution beam and the lower distribution beam of the static loading test device.
Comparatively crucially, this technical scheme still includes following technical essential:
(1) the steel bearing platform is placed above the bottom cushion beam, and the bottom cushion beam is positioned near the diaphragm plate of the steel bearing platform, so that the self-weight load of the upper structure can be borne more favorably; the length directions of the two are vertically arranged, so that the side turning of the whole test device is prevented during testing.
(2) Placing an inverted T-shaped reinforcement cage of an inner upright post and a bearing platform of the pier with the mixed structure in a steel-concrete bearing platform connecting piece, and erecting a template to pour the concrete bearing platform and the upright post; after the concrete is cured, removing the formwork, and forming an integral component by the concrete bearing platform, the upright post and the steel-concrete bearing platform connecting piece; and then placing the integral component on a steel bearing platform, aligning the bolt holes of the bottom plate of the steel-concrete bearing platform connecting piece and the bolt holes of the top plate of the steel bearing platform, and screwing the bolts for anchoring connection.
(3) There are two parts area vertical stiffening rib's shaped steel distributing beam above the bent cap, and wherein the length direction of distributing beam is on a parallel with steel bent cap length direction down, arranges in the support cushion top, places square gasket and fluid pressure type jack in distributing beam roof plate center department down, and gasket and last distributing beam are placed in proper order to the jack top, and the length direction perpendicular to steel bent cap length direction of going up the distributing beam just is good at the width of steel bent cap. Therefore, the prestressed tendons and the anchoring devices are arranged on the outer side of the test specimen in the width direction through the pair of distribution beams vertically arranged in the length direction, so that the installation is convenient, and the operation space is larger.
(4) One end of the prestressed anchorage device is anchored at a round hole at the top of the upper distribution beam (outside the steel cover beam in the width direction), the prestressed beam passes through the round hole of the upper distribution beam and a notch on the flange at the outer side of the steel bearing platform, the other end of the prestressed anchorage device is anchored at a notch of a web stiffening rib of the steel bearing platform, and the whole test device forms a self-reaction force loading system.
Compared with the prior art, the invention has the following technical advantages:
1) in the method for testing the bending resistance bearing capacity of the pier with the steel-concrete mixed structure, the testing system is high in prefabrication degree, small-volume components are convenient to transport, the assembling process is simple and easy, and the safety is excellent.
2) The test method for testing the bending resistance bearing capacity of the bridge pier with the steel-concrete mixed structure in the technical scheme can be used for bridge piers with various structures such as single columns/double columns and the like, and is good in applicability.
3) The test method for testing the bending resistance bearing capacity of the bridge pier with the steel-concrete mixed structure in the technical scheme enables the operation space in the test process to be large, and the test specimen can be replaced through simple operation to be tested repeatedly.
Drawings
Fig. 1 is a vertical layout view of a double-column bridge pier experimental system in the technical scheme;
fig. 2 is a vertical layout view of the single-column pier experimental system in the technical scheme;
FIG. 3 is a side layout view of a single-column/double-column bridge pier experimental system in the technical scheme;
fig. 4 is a schematic structural view of pouring concrete columns and bearing platforms by using the steel-concrete bearing platform connecting piece as a template in the technical scheme;
FIG. 5 is a schematic structural view of the installation of the steel bearing platform and the bottom bolster in the present technical solution;
fig. 6 is a schematic structural diagram of the technical scheme for mounting the testing device on the steel bearing platform.
In the figure: 1. the steel base beam, 2, the steel bearing platform, 3, the steel-concrete bearing platform connecting piece, 4, the support cushion block, 5, the steel cover beam, 6, the lower distribution beam, 7, the hydraulic jack, 8, the upper distribution beam, 9, the prestressed anchorage device, 10, the prestressed beam, 11 and the concrete upright column.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. In the technical scheme, the features such as component model, material name, connection structure, control method, algorithm and the like which are not explicitly described are all regarded as common technical features disclosed in the prior art.
On the basis of research and development basic conception, the main steps of the bending test of the large-scale member by utilizing the reaction frame in the technical scheme are as follows: (1) prefabricating and transporting all components of the reaction frame to a test site and assembling the components into a complete reaction frame structure, (2) adjusting the height of a cross beam and placing a test piece on a base, then placing a hydraulic system at a specified position of the test piece according to a loading working condition, fixing the test piece and the hydraulic system by adjusting the height of the cross beam and a lifting system, and performing a bending resistance bearing capacity test.
The invention discloses a test method for testing the shear-resistant bearing capacity of a welding nail under the condition of concrete cracking, which comprises the following steps:
(1) and prefabricating and preparing a support cushion block, a section steel distribution beam, a hydraulic jack, a prestressed steel beam, an anchorage device, a steel-concrete bearing platform connecting piece, a steel bearing platform, a bottom pad beam and other loading devices, and steel structure parts such as a steel cover beam, a steel bar, a bolt, a nut and the like in the mixed structure pier test specimen.
(2) Binding the upright columns in the pier with the reinforcing steel bars of the bearing platform to form an inverted T-shaped reinforcing cage, placing the reinforcing cage in the connecting piece of the steel-concrete bearing platform, and erecting a formwork to pour the concrete bearing platform and the upright columns. And after the concrete is cured, removing the formwork, and forming an integral component by the concrete bearing platform, the upright post and the steel-concrete bearing platform connecting piece.
(3) Placing bottom pad beams on the ground at parallel intervals, placing the steel bearing platform above the bottom pad beams and vertically arranging the steel bearing platform in the length direction of the bottom pad beams and the steel bearing platform, moving the bottom pad beams to be close to the transverse partition plate of the steel bearing platform, aligning pad beam top plate bolt holes and steel bearing platform bottom plate bolt holes, and screwing bolts for anchoring connection.
(4) Hoisting the concrete upright post, the bearing platform and the steel-concrete bearing platform connecting piece integral structure, placing the integral structure on the steel bearing platform, aligning the bolt hole of the steel-concrete bearing platform connecting piece bottom plate and the bolt hole of the steel bearing platform top plate, and screwing the bolt for anchoring connection. The steel cover beam is hoisted to the position above the concrete upright column to be aligned, the steel cover beam is fixedly connected into a mixed structure pier integral test piece, and the length direction of the steel cover beam is consistent with that of the steel bearing platform.
(5) The support cushion block is placed at the position of each partition plate of a top plate of the steel cover beam according to the requirement of a loading working condition, the profile steel distribution beam with the vertical stiffening ribs is divided into an upper part and a lower part, wherein the length direction of the lower distribution beam is parallel to the length direction of the steel cover beam and is arranged above the support cushion block, a square gasket and a hydraulic jack are placed at the center of a top plate of the lower distribution beam, the gasket and the upper distribution beam are sequentially placed at the top of the hydraulic jack, the length direction of the upper distribution beam is perpendicular to the length direction of the steel cover beam, a round hole is formed in the part of the length direction exceeding the width of the steel cover beam, and the hole diameter is slightly smaller than that of the prestress anchor.
(6) And finally, one end of a prestressed anchorage device is anchored at a round hole at the top of the upper distribution beam, a prestressed beam passes through the round hole of the upper distribution beam and a notch of an outer side flange of the steel bearing platform, the other end of the prestressed anchorage device is anchored at a notch of a web stiffening rib of the steel bearing platform, and the whole experimental system forms a self-reaction force loading system from the above and loads the prestressed beam through a jack until the structure is damaged.
The reaction force loading system for the bending resistance bearing capacity test of the pier with the steel-concrete mixed structure in the embodiment comprises an upper anchoring end, a lower anchoring end, a prestressed steel bundle 10 and a hydraulic jack 7, wherein the hydraulic jack is specifically shown in fig. 1 to 6.
The upper anchoring end is arranged on an upper distribution beam 8 of the static force loading test device; the lower anchoring end is arranged on a steel bearing platform 2 of the static force loading test device, and a bridge pier test piece of the steel-concrete mixed structure is arranged between the steel bearing platform 2 and a lower distribution beam 6 of the static force loading test device; two ends of the prestressed steel bundle 10 are respectively fixed at the upper anchoring end and the lower anchoring end; the hydraulic jack 7 is arranged between an upper distributing beam 8 and a lower distributing beam 6 of the static loading test device.
In the embodiment, the lower distribution beam is arranged above the support cushion block, and the length direction of the lower distribution beam is consistent with that of the steel cover beam. The length direction of the upper distribution beam is vertical to the length direction of the steel cover beam, a part of the length of the upper distribution beam, which exceeds the width of the steel cover beam, is provided with a round hole, and the aperture of the round hole is slightly smaller than that of the prestressed anchorage device. One end of the prestressed anchorage device is anchored at the round hole of the top plate of the upper distribution beam, the prestressed beam passes through the round hole of the upper distribution beam and the notch of the flange on the outer side of the steel bearing platform, and the other end of the prestressed anchorage device is anchored at the notch of the web stiffening rib of the steel bearing platform.
The mixed structure pier static force loading test device in this technical scheme is shaped steel pad roof beam 1 in the below, and shaped steel pad roof beam 1 arranges in the diaphragm plate below of steel bearing platform 2, and the two passes through the bolt anchor to be connected, the length direction of bolt anchor length direction perpendicular to steel bearing platform, and the width of steel bearing platform is far longer than to length to prevent overall structure from turning on one's side in the test. The steel bearing platform 2 is formed by butt welding H-shaped steel flanges, longitudinal stiffening ribs are welded at the height position of the web 1/3, and a plurality of transverse partition plates are arranged. The bottom plate near the diaphragm plate is provided with a small hole and is connected with a bottom pad beam through bolt anchoring, the top plate of the steel bearing platform 2 is also provided with a small hole close to the position of the web plate and is connected with an upper steel concrete bearing platform connecting piece 3 through bolt anchoring, the flange at the outer side of the top plate of the steel bearing platform 2 and the web plate are longitudinally stiffened and provided with a plurality of semicircular notches, and the aperture is slightly smaller than that of the prestressed anchorage device and is used for penetrating through a prestressed steel beam. A steel-concrete bearing platform connecting piece 3 is arranged above the steel bearing platform 2, the connecting piece is of an uncovered cuboid structure formed by welding four steel plates in the central area of a rectangular bottom plate, welding nails are welded on the bottom surface of the structure and the inner side of the box body, and the concrete bearing platform is obtained by pouring by taking the uncovered cuboid structure as a template; the outer side of the box body is welded with a bracket for stiffening, and the part of the bottom plate of the steel bearing platform 2, which is positioned on the outer side of the box body, is provided with small holes which are in one-to-one correspondence with the small holes on the top plate of the steel bearing platform 2 and are connected with each other through bolt anchoring.
In the technical scheme, the bottom of a test piece of the mixed structure pier test is connected with a steel-concrete bearing platform connecting piece 3, a square support cushion block 4 is arranged at the top of the test piece, and the test piece is placed at each partition plate position of a top plate of a steel bent cap 5 to simulate the force transmission effect of an actual structure. The shaped steel distributive girder of vertical stiffening of area is divided into two parts from top to bottom, wherein the length direction of distributing girder 6 is on a parallel with 5 length direction of steel bent cap down, arrange in 4 tops of support cushion, place square gasket and fluid pressure type jack 7 in 6 roof centers department of distributing girder down, gasket and last distributing girder 8 are placed in proper order at fluid pressure type jack 7 tops, the length direction perpendicular to 5 length direction of steel bent cap of last distributing girder 8, and the part that 8 length direction of last distributing girder surpassed 5 width of steel bent cap is opened has the round hole, the aperture slightly is less than prestressed anchorage utensil 9. And finally, one end of a prestressed anchorage device 9 is anchored at a round hole at the top of the upper distribution beam 8, a prestressed steel beam 10 passes through the round hole of the upper distribution beam 8 and a notch of the flange at the outer side of the steel bearing platform 2, the other end of the prestressed steel beam is anchored at a notch of a web stiffening rib of the steel bearing platform 2, and the whole test device forms a self-reaction force loading system and carries out loading through a jack.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The test method for the bending resistance bearing capacity of the bridge pier with the steel-concrete mixed structure is characterized by comprising the following steps of:
s1: prefabricating and preparing each part of a loading device, and preparing a steel structure part in a pier test specimen of a steel-concrete mixed structure, wherein the loading device comprises a support cushion block, a profile steel distribution beam, a hydraulic jack, a prestressed steel bundle, an anchorage device, a steel bearing platform connecting piece, a steel bearing platform and a bottom pad beam;
s2: preparing a concrete bearing platform, a column and a steel-concrete bearing platform connecting piece, and constructing an integral test member;
s3: arranging a bottom pad beam, and fixing a steel bearing platform above the bottom pad beam;
s4: hoisting the integral test member on a steel bearing platform, mounting a steel structure part on the integral test member, and fixedly connecting to obtain a pier integral test piece with a steel-concrete mixed structure;
s5: arranging a profile steel distribution beam on the integral test piece of the pier with the steel-concrete mixed structure, arranging a support cushion block in a matching way, and arranging a hydraulic jack between an upper distribution beam and a lower distribution beam of the profile steel distribution beam;
s6: and respectively anchoring two ends of the prestressed steel bundle on the upper distribution beam and the steel bearing platform through a prestressed anchorage device to form a counter-force loading system, and loading through a jack until the structure is damaged.
2. The method for testing bending resistance bearing capacity of a pier with a steel-concrete mixed structure according to claim 1, wherein in the step S1, the steel structure part comprises a steel cap beam, a steel bar, a bolt and a nut.
3. The test method for bending resistance bearing capacity of pier with steel-concrete mixed structure as claimed in claim 1, wherein in S2, the process of constructing the integral test member comprises:
and (3) binding the reinforcing steel bars of the upright post and the bearing platform in the pier with the mixed structure to form an inverted T-shaped reinforcing steel cage, placing the inverted T-shaped reinforcing steel cage in the steel-concrete bearing platform connecting piece, pouring the concrete bearing platform and the upright post by using the vertical template, removing the template after the concrete curing is finished, and forming an integral component by using the concrete bearing platform, the upright post and the steel-concrete bearing platform connecting piece.
4. The test method for bending resistance bearing capacity of the bridge pier with the steel-concrete mixed structure as claimed in claim 1, wherein in the step S3, the process of arranging the bottom bolster comprises the following steps:
the bottom pad beam is placed on the ground at parallel intervals, the steel bearing platform is placed above the bottom pad beam and is vertically arranged in the length direction of the bottom pad beam and the steel bearing platform, then the bottom pad beam is moved to the position of the transverse partition plate of the steel bearing platform, and the bottom pad beam is fixedly connected with the steel bearing platform through bolts.
5. The test method for the bending resistance bearing capacity of the bridge pier with the steel-concrete mixed structure as claimed in claim 1, wherein the S4 comprises the following steps of S4-1: hoisting the integral test component and placing the integral test component on the steel bearing platform, aligning the bolt holes of the bottom plate of the steel-concrete bearing platform connecting piece and the bolt holes of the top plate of the steel bearing platform, and screwing the bolts to enable the steel-concrete bearing platform connecting piece to be in anchoring connection with the steel bearing platform.
6. The test method for bending resistance bearing capacity of the bridge pier with the steel-concrete mixed structure as claimed in claim 5, wherein the step S4 further comprises the steps of S4-2: the steel cover beam is hoisted to the position above the concrete upright column to be aligned and placed, the steel cover beam is fixedly connected to a whole test piece of the pier with the steel-concrete mixed structure, and the length direction of the steel cover beam is consistent with that of the steel bearing platform.
7. The method for testing bending resistance bearing capacity of a bridge pier with a steel-concrete mixed structure according to claim 1, wherein the step S5 comprises the following steps:
s5-1: placing the support cushion blocks at the positions of the partition plates of the steel bent cap top plate according to the requirement of a loading working condition;
s5-2: the structural steel distribution beam with the vertical stiffening ribs is divided into an upper part and a lower part, wherein the length direction of the lower distribution beam is parallel to the length direction of the steel cover beam and is arranged above the support cushion block, the center of the top plate of the lower distribution beam is provided with a gasket and an upper distribution beam, the top of the jack is provided with the gasket and the upper distribution beam in sequence, the length direction of the upper distribution beam is perpendicular to the length direction of the steel cover beam, the extension part of the length direction exceeding the width of the steel cover beam is provided with a round hole, and the aperture of the round hole is smaller than that of a prestressed anchor.
8. The method of claim 1, wherein in the step S6, one end of the prestressed anchorage device is anchored at a circular hole at the top of the upper girder, the tendon passes through the circular hole of the upper girder and the notch of the outer flange of the steel bearing platform, and the other end is anchored at the notch of the web stiffener of the steel bearing platform, and the whole test system forms a self-reaction force loading system.
9. The test method for the bending resistance bearing capacity of the bridge pier with the steel-concrete mixed structure as claimed in claim 2, wherein the test piece for the bridge pier with the mixed structure comprises a single column pier or a double column pier structure.
10. The utility model provides a reaction loading system that is used for steel-concrete mixed structure pier bending resistance bearing capacity which characterized in that includes:
the upper anchoring end is arranged on an upper distribution beam (8) of the static force loading test device;
the lower anchoring end is arranged on a steel bearing platform (2) of the static force loading test device, and the steel-concrete mixed structure pier test piece is arranged between the steel bearing platform (2) and a lower distribution beam (6) of the static force loading test device;
the two ends of the prestressed steel bundle (10) are respectively fixed at the upper anchoring end and the lower anchoring end;
and the hydraulic jack (7) is arranged between the upper distribution beam (8) and the lower distribution beam (6) of the static loading test device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111385518.8A CN114252218A (en) | 2021-11-22 | 2021-11-22 | Test method for bending resistance bearing capacity of pier with steel-concrete mixed structure and counter-force loading system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111385518.8A CN114252218A (en) | 2021-11-22 | 2021-11-22 | Test method for bending resistance bearing capacity of pier with steel-concrete mixed structure and counter-force loading system |
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| Publication Number | Publication Date |
|---|---|
| CN114252218A true CN114252218A (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111385518.8A Pending CN114252218A (en) | 2021-11-22 | 2021-11-22 | Test method for bending resistance bearing capacity of pier with steel-concrete mixed structure and counter-force loading system |
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| CN (1) | CN114252218A (en) |
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2021
- 2021-11-22 CN CN202111385518.8A patent/CN114252218A/en active Pending
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