CN210604134U - Device for simulating equivalent node load in bridge section model - Google Patents
Device for simulating equivalent node load in bridge section model Download PDFInfo
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- CN210604134U CN210604134U CN201921526607.8U CN201921526607U CN210604134U CN 210604134 U CN210604134 U CN 210604134U CN 201921526607 U CN201921526607 U CN 201921526607U CN 210604134 U CN210604134 U CN 210604134U
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Abstract
The utility model discloses a device for simulating equivalent node load in a bridge segment model, which comprises a pair of concrete supports, a pair of hydraulic support units and a pair of hydraulic support units, wherein the supports are arranged at the bottoms of a first beam end and a second beam end of the bridge segment model; the support frame system is arranged at the first beam end, and is provided with a shear jack, an axial jack and a bending moment jack; the end part of the first beam end is fixedly provided with a rigid beam, the upper end and the lower end of the rigid beam respectively extend out of the bridge section model, and two bending moment jacks are arranged and respectively apply axial forces with opposite directions to the upper end and the lower end of the rigid beam; the shear jacks are located at the top and the bottom of the first beam end and used for applying vertical shear force to the first beam end, and the axial force jacks are arranged on the outer side of the rigid beam to apply axial force to the first beam end. The device can realize the node equivalence of loads such as axial force, shearing force, bending moment and the like through the combined action of the jack, the support frame system and the rigid beam, and has the advantages of simple structure, flexible operation, high safety and the like.
Description
Technical Field
The utility model belongs to the technical field of bridge engineering, concretely relates to a device that is arranged in simulating equivalent node load in bridge segment model.
Background
Bridge model tests are a common means of studying bridge structure performance. The research on model tests at home and abroad mainly focuses on two aspects: firstly, carrying out a full-scale model test to obtain the ultimate bearing capacity; secondly, the stress condition of the key part is analyzed by adopting a reduced scale or local segment model test, and the mechanical property of the whole structure is further evaluated. The segment model test has good economy, strong operability and obvious test effect, is favored by researchers and is widely applied. However, since the segment model is a part taken from the whole model, corresponding internal forces inevitably exist at two ends of the segment in the original structure, and most of the internal forces are axial force, shearing force and bending moment in engineering. How to consider these internal forces in the original structure becomes the key to restrict the effect of the model test. Therefore, there is a need for a device that can be used to simulate equivalent nodal loads in a segmental model test.
In recent years, some segment model tests are carried out by scholars at home and abroad, but due to the existence of a scale ratio in the model tests, the applied test load is usually far smaller than the actual load, so that the researchers often neglect the equivalent processing of node load in the original structure, which has a great influence on the accuracy of the test result. Moreover, the existing node equivalent test device has the disadvantages of excessively large components, high manufacturing cost, complex actual operation, unclear force transmission path and lack of a simple node load equivalent device.
Disclosure of Invention
The present application is directed to solving one of the technical problems in the prior art. Therefore, the utility model aims to provide an effect is obvious, easy and simple to handle, can be effectively used for simulating the device of equivalent node load in the bridge segment model.
In order to solve the technical problem, the following technical scheme is adopted in the application:
an apparatus for simulating equivalent nodal loads in a bridge segment model, comprising:
the pair of concrete supports are supported and arranged at the bottoms of the first beam end and the second beam end of the bridge section model;
the support frame system is arranged at the first beam end of the bridge section model, and is provided with a shear jack, an axial force jack and a bending moment jack;
the end part of the first beam end of the bridge section model is fixedly provided with a rigid beam, the upper end and the lower end of the rigid beam respectively extend out of the bridge section model, and two bending moment jacks are arranged and respectively apply axial forces in opposite directions to the upper end and the lower end of the rigid beam;
the shear jacks are arranged at the top and the bottom of the first beam end of the bridge section model in pairs and used for applying vertical shear force to the shear jacks, and the axial force jacks are arranged on the outer side of the rigid beam and used for applying axial force to the first beam end of the bridge section model.
Further, still including setting up the protective bracket on the concrete support, the top of protective bracket is equipped with the open slot, bridge segment model alternates in the open slot and have the clearance with the cell wall, and two liang do not contact, only provide the safety guarantee.
The protective bracket is formed by welding profile steels and is fixedly connected with the concrete support. The section steel can be I-shaped steel,Channel steel、Corner SteelOr round steel, etc.
Furthermore, be equipped with elastic support on the concrete support, elastic support's top is equipped with one-level leveling steel sheet, bridge segmental model sets up on one-level leveling steel sheet. The first-level leveling steel plate can ensure the stress uniformity of a contact surface and eliminate errors and safety risks caused by the unevenness of manufacturing and processing of the surface of the bridge section model.
Furthermore, the elastic support with still be equipped with second grade leveling steel sheet between the concrete support, be located the first beam end of bridge section model second grade leveling steel sheet with be equipped with between the concrete support shear jack is located first beam end bottom shear jack is relative with the shear jack position that is located first beam end top.
Furthermore, the first-level leveling steel plate and the second-level leveling steel plate are welded with the elastic support, the center line of the elastic support is perpendicular to the longitudinal center line of the lower surface of the bridge section model in principle, eccentricity is avoided, the effectiveness of load transmission can be guaranteed through the leveling steel plates and the elastic support, and sudden deformation such as large displacement of the structural support is avoided, so that the stability of a structural system is improved.
Further, the end part of the first beam end of the bridge section model is integrally cast to form a beam end steel plate, the rigid beam is fixedly connected with the beam end steel plate through a screw assembly, the beam end steel plate integrally covers the end part of the bridge section model, the beam end steel plate is arranged to ensure the uniformity of a stress surface, and the local crushing of the concrete main beam section is avoided.
Further, the screws of the screw assemblies are embedded and poured in the bridge section model and penetrate through the rigid beam and the beam end steel plate to be connected with the locking nuts of the screw assemblies. And the rigid beam and the beam-end steel plate are anchored by matching a locking nut and a screw rod.
Furthermore, the screw assemblies for connecting the rigid beam and the beam end steel plate are provided with a group of screw assemblies which are positioned on a neutral axis plane of the bridge section model, and the other screw assemblies are symmetrically arranged at the upper end and the lower end of the axial section of the neutral axis plane. The force application direction of the axial force jack passes through the neutral axis position of the cross section of the bridge section model, so that the equivalent node load is ensured to act on the section centroid position of the bridge section model. The force application direction of the shear jack is positioned in the vertical plane and is superposed with the central line of the elastic support, so that no additional moment caused by position deviation is ensured. The position of the jack action when simulating other eccentric load working conditions can be set according to specific conditions.
Furthermore, the support frame system is formed by welding channel steel and rectangular steel plates, the rectangular steel plates and the channel steel are welded to form a stable triangle, so that the stability of the support frame system is guaranteed, and the designed welding positions of the channel steel and the rectangular steel plates are determined according to the positions of the bridge section models.
Furthermore, steel cushion blocks are arranged at the positions of the support frame system corresponding to the bottoms of the shear jack, the axial jack and the bending moment jack, and the steel cushion blocks are welded with channel steel in the support frame system to provide enough acting area for the jacks. And a pore passage through which the screw passes is formed in the steel cushion block, and the steel cushion block is fixedly connected with the jack through the screw and the locking nut.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model can realize the node equivalence of the loads such as axial force, shearing force, bending moment and the like through the combined action of the axial force jack, the shearing force jack, the bending moment jack, the support frame system and the rigid beam, and ensure the reliability of the test result of the segment model; by leveling the steel plate and the elastic support, the effectiveness of load transmission is ensured, and sudden deformation such as large displacement of the structural support is avoided; and the safety of the model test is ensured through the protective bracket.
Drawings
Fig. 1 is a schematic diagram of equivalent node load according to an embodiment of the present invention;
fig. 2 is a perspective view of an embodiment of the present invention;
fig. 3 is a front view of an embodiment of the present invention;
FIG. 4 is a schematic view of a support frame system and a protective bracket according to an embodiment of the present invention;
FIG. 5 is a schematic view of a beam-end connection according to an embodiment of the present invention;
fig. 6 is a schematic view of a jack fixing device according to an embodiment of the present invention;
fig. 7 is a schematic view of the connection of the elastic support according to the embodiment of the present invention.
In the figure: 1. the device comprises a support frame system, 2, an axial force jack, 3, a shear force jack, 4, a bending moment jack, 5, a rigid beam, 6, channel steel, 7, a beam end steel plate, 8, a rectangular steel plate, 9, a leveling steel plate, 10, a steel cushion block, 11, an elastic support, 12, a bridge section model, 13, a concrete support, 14, a protective support, 15, a screw rod, 16 and a locking nut.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Examples
Referring to fig. 1-7, a device for simulating equivalent node load in a bridge segment model comprises a support frame system 1, an axial jack 2, a shear jack 3, a bending moment jack 4, a rigid beam 5, a channel steel 6, a beam end steel plate 7, a rectangular steel plate 8, a leveling steel plate 9, a steel cushion block 10, an elastic support 11, a bridge segment model 12, a concrete support 13, a protective support 14, a screw 15 and a locking nut 16.
In this embodiment, the bridge segment model 12 is a concrete main beam segment model, and may be a steel beam segment made of steel or a segment made of other building materials, and the concrete main beam segment model is not only a reduced-scale model segment, but also a full-scale model. The bridge segment model 12 has opposite ends and is designated as a bridge segment model first beam end and a bridge segment model second beam end, respectively.
Referring to fig. 2 and 3, a pair of concrete supports 13 are arranged on the ground, bottom supports of a first beam end and a second beam end of a bridge section model 12 are arranged on the pair of concrete supports 13, a protective bracket 14 and a leveling steel plate 9 (a second-level leveling steel plate) are arranged on the concrete supports 13 of the second beam end, an elastic support 11 is arranged on the second-level leveling steel plate 9, and a leveling steel plate 9 (a first-level leveling steel plate) is arranged on the elastic support 11; arranging a protective bracket 14 and a shear jack 3 on a concrete support 13 at the first beam end, arranging a leveling steel plate 9 (a secondary leveling steel plate) on the shear jack 3, arranging an elastic support 11 on the leveling steel plate 9, and arranging a leveling steel plate 9 (a primary leveling steel plate) on the elastic support 11; two ends of the bridge section model 12 are respectively erected on the two first-stage leveling steel plates 9, and two ends of the bridge section model 12 penetrate through the open grooves in the top of the protective support 14; arranging a beam end steel plate 7 at the end part of the first beam end of the bridge section model 12, and erecting a support frame system 1 on the ground of the end; the beam end steel plate 7 is provided with a rigid beam 5, and specifically, the rigid beam 5 can be made of section steel. The rigid beam 5 is provided with an axial jack 2 and a bending moment jack 4, and the upper surface of the end bridge section model 12 is provided with a leveling steel plate 9 and a shear jack 3.
Referring to fig. 2, 4 and 5, the support frame system 1 is provided with steel pads 10 corresponding to the installation positions of the shear jack, the axial jack and the bending moment jack, and the shear jack 3, the axial jack 2 and the bending moment jack 4 are fixedly connected with the corresponding steel pads 10 through screw assemblies, so that the shear jack 3, the axial jack 2 and the bending moment jack 4 are installed on the support frame system 1. The upper end and the lower end of the rigid beam 5 respectively extend out of the bridge section model, two bending moment jacks 4 are arranged, and axial forces with opposite directions are respectively applied to the upper end and the lower end of the rigid beam 5, so that a pair of force couples, namely bending moments, are formed at the centroid position of the beam end of the bridge section model 12; the shear jacks are located at the top and the top of the first beam end of the bridge section model and used for applying vertical shear force to the bridge section model, and the axial force jacks are arranged on the outer side of the rigid beam and used for applying axial force to the first beam end of the bridge section model.
Referring to fig. 2 and 4, it should be noted that the protective bracket 14 is formed by welding a channel steel 6 and is fixedly connected with the concrete support 13, the support frame system 1 is formed by welding a channel steel 6, and the rectangular steel plate 8 is welded with the channel steel 6 to form a stable triangle, so as to ensure the stability of the support frame system 1. The steel cushion block 10 is welded with the channel steel 6 in the support frame system 1, so that a sufficient force application area is provided for the jack, a pore passage for the screw rod 15 to pass through is formed in the steel cushion block 10, and the steel cushion block 10 and the jack are fixedly connected through the screw rod 15 and the locking nut 16.
Referring to fig. 3 and 7, it can be understood that, in the actual design, the leveling steel plate 9 is welded with the elastic support 11, the center line of the elastic support 11 is in principle perpendicular to the longitudinal center line of the lower surface of the bridge segment model 12, so as to ensure that no eccentricity exists, the leveling steel plate 9 can ensure the uniformity of the stress of the contact surface through the leveling steel plate 9 and the elastic support 11, eliminate errors and safety risks caused by the unevenness of the surface of the bridge segment model 12 due to manufacturing and processing, and the elastic support 11 can ensure the effectiveness of load transmission, avoid the occurrence of large displacement and other sudden deformations of the structural support, and improve the stability of the structural system.
It should be noted that the inside dimension of the open slot at the top of the shield support 14 is slightly larger than the cross-sectional dimension of the bridge segment model 12, and the open slot can just accommodate the bridge segment model 12, and ensure that the two are not in contact, only providing safety.
Referring to fig. 5, it is to be noted that the beam end steel plate 7 is cast and fixed with the bridge segment model 12 to form a whole. The rigid beam 5 is fixedly connected with the beam end steel plate 7 and the bridge section model 12 by a screw 15 and a locking nut 16.
Specifically, corresponding pore channels are formed in the rigid beam 5 and the beam end steel plate 7 so that the screw rods 15 can pass through, the screw rods 15 are pre-embedded and poured in the bridge section model 12, the rigid beam 5 and the beam end steel plate 7 are anchored by the locking nuts 16, the beam end steel plate 7 can ensure the uniformity of a stress surface, and the local crushing of the bridge section model 12 is avoided.
It should be noted that, the screw rods 15 are basically provided with a group of screw rods 15 located on the neutral axis plane of the bridge segment model 12, the other screw rods 15 are symmetrically arranged on the cross section with reference to the position, the action point of the jacking force of the axial jack 2 passes through the neutral axis position of the cross section of the bridge segment model 12 in principle, so as to ensure that the equivalent node load acts on the section centroid position of the bridge segment model 12, and the action line of the shear jack 3 is basically located in the vertical plane and coincides with the central line of the elastic support 11, so as to ensure that no additional moment caused by position deviation exists. The position of the jack can be set according to specific conditions when working conditions of other eccentric action points are simulated.
The force application principle of the embodiment is as follows: the axial force jack 2 is connected with the support frame system 1 in an anchoring mode through a screw 15 and a locking nut 16, and after jacking force is applied, an axial force is applied to the cross section centroid of the bridge section model 12; the bending moment jack 4 is connected with the support frame system 1 by a screw 15 and a lock nut 16 in an anchoring way, and after jacking forces are respectively exerted on two ends of the rigid beam 5 along opposite directions, a pair of couples, namely bending moments, can be formed at the centroid position of the beam end of the bridge section model 12; the shear jacks 3 on the upper surface of the bridge section model 12 are anchored and connected with the support frame system 1 by screws 15 and locking nuts 16, a jacking force is applied to the bridge section model 12, then, another shear jack 3 on the concrete support 13 at the first beam end also applies a jacking force, the difference of the jacking forces of the two shear jacks 3 is converted into elastic potential energy to be absorbed by the elastic support 11, and the elastic support 11 applies a reverse force to the bridge section model 12 due to the recovery of deformation, namely, the shear force.
The utility model can realize the node equivalence of the loads such as axial force, shearing force, bending moment and the like through the combined action of the axial force jack, the shearing force jack, the bending moment jack, the support frame system and the rigid beam, and ensure the reliability of the test result of the segment model; by leveling the steel plate and the elastic support, the effectiveness of load transmission is ensured, and sudden deformation such as large displacement of the structural support is avoided; through the protective support, the safety of the model test is ensured.
Claims (10)
1. An apparatus for simulating equivalent nodal loading in a bridge segment model, comprising:
the pair of concrete supports are supported and arranged at the bottoms of the first beam end and the second beam end of the bridge section model;
the support frame system is arranged at the first beam end of the bridge section model, and is provided with a shear jack, an axial force jack and a bending moment jack;
the end part of the first beam end of the bridge section model is fixedly provided with a rigid beam, the upper end and the lower end of the rigid beam respectively extend out of the bridge section model, and two bending moment jacks are arranged and respectively apply axial forces in opposite directions to the upper end and the lower end of the rigid beam;
the shear jacks are arranged at the top and the bottom of the first beam end of the bridge section model in pairs and used for applying vertical shear force to the shear jacks, and the axial force jacks are arranged on the outer side of the rigid beam and used for applying axial force to the first beam end of the bridge section model.
2. The device as claimed in claim 1, further comprising a protective bracket arranged on the concrete support, wherein an open slot is formed in the top of the protective bracket, and the bridge segment model is inserted into the open slot and has a gap with the slot wall.
3. The device according to claim 1, wherein the concrete support is provided with an elastic support, the top of the elastic support is provided with a first-level leveling steel plate, and the bridge section model is arranged on the first-level leveling steel plate.
4. The device according to claim 3, wherein a second-level leveling steel plate is further arranged between the elastic support and the concrete support, and the shear jack is arranged between the second-level leveling steel plate positioned at the first beam end of the bridge section model and the concrete support.
5. The device of claim 3, wherein the centerline of said elastomeric bearing perpendicularly intersects the longitudinal centerline of said lower model bridge section surface.
6. The device according to claim 1, wherein the first beam end of the bridge section model is integrally cast with a beam end steel plate at the end, and the rigid beam is fixedly connected with the beam end steel plate through a screw assembly.
7. The device of claim 6, wherein the screws of the screw assembly are cast in the bridge section model in a pre-embedded mode and penetrate through the rigid beam and the beam end steel plate to be connected with the locking nuts of the screw assembly.
8. The apparatus of claim 6, wherein the screw assemblies connecting the rigid beams and the beam-end steel plates are arranged in a group on a neutral axis plane of the bridge section model, and the rest screw assemblies are arranged symmetrically with respect to the upper end and the lower end of the neutral axis plane in the axial section.
9. The apparatus of claim 1, wherein the direction of the force applied by the axial jack passes through the centroid of the cross section of the bridge section model.
10. The device of claim 3, wherein the force application direction of the shear jack is located in the vertical plane and coincides with the center line of the elastic support.
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| CN201921526607.8U CN210604134U (en) | 2019-09-11 | 2019-09-11 | Device for simulating equivalent node load in bridge section model |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117433906A (en) * | 2023-12-19 | 2024-01-23 | 华侨大学 | Loading device and loading method of three-dimensional photoelastic model |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117433906A (en) * | 2023-12-19 | 2024-01-23 | 华侨大学 | Loading device and loading method of three-dimensional photoelastic model |
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