A steel bridge u rib weld joint equivalent fatigue test device

Abstract

The utility model relates to a kind of steel bridge U rib weld equivalent fatigue test device, it is characterized by: including U rib model and the first clamping mechanism for fixing U rib model, second clamping mechanism and web fixing mechanism, the U rib model includes panel and web, the first clamping mechanism and second clamping mechanism are respectively used to clamp the both ends of panel, the web fixing mechanism is used to fix web, second clamping mechanism upper portion is clamped by fatigue testing machine brake upper chuck, the first clamping mechanism and web fixing mechanism are fixed in the bottom plate of test platform. The device of the utility model can accurately simulate the stress that steel bridge U rib weld is subjected to in actual service process, device component is designed according to model characteristics, simple structure, material-saving, small, test operation is simple, detection and dismounting are convenient.

Description

Technical Field

[0001] This utility model belongs to the field of steel structure engineering technology, and in particular relates to an equivalent fatigue test device for U-rib welds of steel bridges. Background Technology

[0002] Orthotropic plate structures in bridge steel structures are load-bearing structures composed of mutually perpendicular stiffening ribs and cover plates welded together. The stiffening ribs are typically U-shaped. This structure has advantages such as light weight, short construction period, large ultimate bearing capacity, large span, rapid prefabrication and installation, and excellent seismic performance, and is widely used in various large and medium-span bridges. Under wheel loads, the U-rib and bridge deck composite structure mainly bears out-of-plane bending stress, making it prone to fatigue cracking. The weld between the U-rib and bridge deck is one of the typical locations for fatigue cracking in orthotropic plate structures.

[0003] The main cracking forms in the U-rib welds of steel bridges include cracking at the weld root, cracking at the weld toe, cracking at the weld throat, and cracking in the U-rib web. Cracks in the welded areas often severely reduce the structural load-bearing capacity and may even cause corrosion of the steel plates, thus reducing the service life of the steel bridge.

[0004] Orthotropic plate structures bear lane loads during bridge service, and the U-rib welds of steel bridges, as fatigue-critical nodes, are prone to fatigue failure under cyclic loading. Current fatigue model tests investigating the fatigue performance and fatigue strength variation of critical nodes in orthotropic plate structures mainly involve multi-U-rib, single-rib, and combinations of single-rib and semi-U-rib models. These tests are time-consuming, material-intensive, costly, and require stringent testing conditions, making them complex and unable to accurately reflect the stress conditions during actual service. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an equivalent fatigue test device for the U-rib weld of steel bridges, which addresses the shortcomings of the existing technology. This device can improve test efficiency, reduce test costs, and effectively reflect the stress conditions during actual service.

[0006] The technical solution adopted in this utility model is as follows: An equivalent fatigue testing device for U-rib welds of steel bridges is characterized by comprising a U-rib model and a first clamping mechanism, a second clamping mechanism, and a web fixing mechanism for fixing the U-rib model. The U-rib model includes a face plate and a web. The first clamping mechanism and the second clamping mechanism are respectively used to clamp the two ends of the face plate. The web fixing mechanism is used to fix the web. The upper part of the second clamping mechanism is clamped by a chuck on the brake of the fatigue testing mechanism. The first clamping mechanism and the web fixing mechanism are fixed on the base plate of the test platform.

[0007] According to the above technical solution, the first clamping mechanism includes a support fixedly installed on the base plate and a first U-shaped plate installed on the support. One end of the panel of the U-rib model extends into the groove of the first U-shaped plate and is fastened by fasteners.

[0008] According to the above technical solution, the support includes a web plate vertically fixed on the base plate and an elbow plate installed on one side of the web plate. The elbow plate is arranged perpendicularly to the web plate, and the first U-shaped plate is installed on the web plate, with one side of it fixedly connected to the elbow plate.

[0009] According to the above technical solution, a support plate is also provided on the other side of the web plate. The support plate is arranged perpendicularly to the web plate and is used to support the first U-shaped plate.

[0010] According to the above technical solution, fasteners for securing the U-rib model panel are provided on both sides and at the top and bottom ends of the first U-shaped plate.

[0011] According to the above technical solution, the second clamping mechanism includes a second U-shaped plate, and a vertical plate for clamping the brake on the fatigue test mechanism is provided at the upper end of the second U-shaped plate. The other end of the panel of the U-rib model extends into the groove of the second U-shaped plate and is fastened by fasteners.

[0012] According to the above technical solution, the web plate fixing mechanism includes an inclined plate, and multiple elbow plates are fixedly installed on one side of the inclined plate. The web plate of the U-rib model is fixed to the inclined plate by fasteners.

[0013] According to the above technical solution, multiple elbow plates are arranged in parallel, and each elbow plate is set in a trapezoidal shape.

[0014] According to the above technical solution, multiple bolt holes are provided on the base plate, which is fixed to the test platform by fasteners.

[0015] According to the above technical solution, the first clamping mechanism and the web plate fixing mechanism are installed in the middle position of the base plate.

[0016] The beneficial effects of this utility model are as follows: 1. The device of this utility model can accurately simulate the stress that the U-rib weld of a steel bridge is subjected to during actual service. The device components are designed according to the characteristics of the model, with simple structure, material saving, small space occupation, simple test operation, and convenient testing and disassembly.

[0017] 2. The combination of the device and the steel bridge U-rib model reflects the actual stress characteristics of the steel bridge U-rib weld, reduces test costs and test condition requirements, and improves test efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional axial schematic diagram of the present invention.

[0020] Figure 2 This is a top view of the three-dimensional structure of this utility model.

[0021] Figure 3 This is a bottom view of the three-dimensional structure of this utility model.

[0022] Wherein: 1-base plate, 2-elbow plate, 3-web plate, 4-U-shaped plate, 5-face plate, 6-vertical plate, 7-U-shaped plate, 8-web plate, 9-elbow plate, 10-bolt hole, 11-sloping plate, 12-test platform, 13-bolt hole, 14-bolt hole, 15-support plate, 16-bolt hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Example 1: like Figure 1-3As shown, this embodiment provides an equivalent fatigue testing device for U-rib welds of steel bridges, including a U-rib model 5 and a first clamping mechanism, a second clamping mechanism, and a web fixing mechanism for fixing the U-rib model. The U-rib model includes a panel 501 and a web 502. The first and second clamping mechanisms are used to clamp the two ends of the panel, respectively. The web fixing mechanism is used to fix the web 502. The upper part of the second clamping mechanism is clamped by a clamp on the brake of the fatigue testing mechanism. The first clamping mechanism and the web fixing mechanism are fixed in the middle position of the base plate 1 of the test platform. The base plate 1 is fixed to the test platform 12 by bolts passing through bolt holes 13 to ensure good stability of the model. This utility model fixes the U-rib model of the steel bridge to the test platform after being fixedly connected by the web fixing mechanism. Since the displacement of the left end of panel 501 has a relatively small impact, the left end of the U-rib model panel is fixedly connected via the first clamping mechanism; after the right end of the model panel is connected via the second clamping mechanism, the clamp on the brake of the fatigue testing mechanism clamps and holds the fixed end plate, applying a vertical load to the model. Cyclic tests are then conducted to simulate the stress conditions of the steel bridge U-rib weld during actual service. The steel bridge U-rib model facilitates the observation and measurement of parameters such as stress and strain at the weld location. The device components are simple and material-saving, and the test operation is simple and convenient.

[0025] The U-rib specimen model in this embodiment includes the bridge top plate and its welded longitudinal rib web structure. The U-rib model 5 in the figure is a part of the U-rib structure in actual working conditions. By conducting an equivalent fatigue test on the weld of the U-rib model 5, the equivalent fatigue condition of the weld of the U-rib can be tested.

[0026] The first clamping mechanism includes a support fixedly mounted on the base plate 1 and a first U-shaped plate 4 mounted on the support. One end of the panel 501 of the U-rib model extends into the groove of the first U-shaped plate 4 and is fastened by fasteners.

[0027] Furthermore, the support includes a web plate 3 vertically fixed to the base plate and an elbow plate 2 mounted on one side of the web plate. The elbow plate 2 is perpendicular to the web plate 3. A support plate 15 is also provided on the other side of the web plate, perpendicular to the web plate 3, for supporting the first U-shaped plate 4. The first U-shaped plate 4 is mounted on the web plate 3, with one side fixedly connected to the elbow plate 2. Bolt holes 14 are provided on both sides and at the top and bottom ends of the first U-shaped plate 4 for tightening the bolts of the U-rib model panel.

[0028] In this embodiment, the second clamping mechanism includes a second U-shaped plate 7. A vertical plate 6 for clamping the brake clamp of the fatigue test mechanism is provided at the upper end of the second U-shaped plate 7. The other end of the panel 501 of the U-rib model extends into the groove of the second U-shaped plate 7 and is fastened by fasteners.

[0029] In this embodiment, the web fixing mechanism includes an inclined plate 11, and four elbow plates 9 are fixedly installed on one side of the inclined plate, which reinforce the inclined plate. The web of the U-rib model is fixed to the inclined plate by fasteners. In this embodiment, the multiple elbow plates 9 are arranged in parallel, and each elbow plate 9 is trapezoidal.

[0030] In this embodiment, the first U-shaped plate 4 of the first clamping mechanism is fixed to the right end of the panel 501 of the U-rib model 5 by bolts passing through the corresponding bolt holes 14 and 16. The clamp on the brake of the fatigue testing mechanism clamps the vertical plate 6, applying a vertical load to the model. Through cyclic testing, the stress condition of the weld of the U-rib model during actual service is simulated to ensure the accuracy of the test. The steel bridge U-rib model is easy to observe and measure parameters such as stress and strain at the weld. The device components are simple and material-saving, the test operation is simple and convenient, the test conditions are low, and the test efficiency is greatly improved.

[0031] Example 2 In this embodiment, the support adopts a base plate 1 with a larger area, which increases the contact area between the support and the test platform 12, making the support more stable. The inclined plate 11 and four elbow plates 9 are welded and fixed to the base plate 1, which can effectively enhance the vertical bearing capacity. The elbow plate 2, web plate 3, support plate 15, U-shaped plate 4 and base plate 1 are welded and fixed, which can effectively enhance the bearing capacity and stability of the left end of the steel bridge U-rib model and ensure the safety of the device.

[0032] Example 3 In this embodiment, the base plate 1 is fixed to the test platform 12 with bolts, the first U-shaped plate 4 and the second U-shaped plate 7 are fixed to the U-rib model 5 with bolts, and the inclined plate 11 is fixed to the web plate 8 with bolts. All are connected by bolts, which makes the device flexible, easy to adjust, install and disassemble, and effectively ensures the accuracy of the test.

[0033] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. An equivalent fatigue testing device for U-rib welds of steel bridges, characterized in that: The test platform includes a U-rib model and a first clamping mechanism, a second clamping mechanism, and a web fixing mechanism for fixing the U-rib model. The U-rib model includes a face plate and a web. The first clamping mechanism and the second clamping mechanism are used to clamp the two ends of the face plate, respectively. The web fixing mechanism is used to fix the web. The upper part of the second clamping mechanism is clamped by a chuck on the brake of the fatigue testing mechanism. The first clamping mechanism and the web fixing mechanism are fixed on the base plate of the test platform.

2. The equivalent fatigue testing device for U-rib welds of steel bridges according to claim 1, characterized in that: The first clamping mechanism includes a support fixedly mounted on the base plate and a first U-shaped plate mounted on the support. One end of the panel of the U-rib model extends into the groove of the first U-shaped plate and is fastened by fasteners.

3. The equivalent fatigue testing device for the U-rib weld of a steel bridge according to claim 2, characterized in that: The support includes a web plate that is vertically fixed to the base plate and an elbow plate that is installed on one side of the web plate. The elbow plate is arranged perpendicularly to the web plate, and the first U-shaped plate is installed on the web plate, with one side of it fixedly connected to the elbow plate.

4. The equivalent fatigue testing device for the U-rib weld of a steel bridge according to claim 3, characterized in that: A support plate is provided on the other side of the web, which is arranged perpendicular to the web and is used to support the first U-shaped plate.

5. The equivalent fatigue testing device for U-rib welds of steel bridges according to claim 2, characterized in that: Fasteners for securing the U-rib model panel are provided on both sides and at the top and bottom ends of the first U-shaped plate.

6. The equivalent fatigue testing device for the U-rib weld of a steel bridge according to claim 1 or 2, characterized in that: The second clamping mechanism includes a second U-shaped plate. A vertical plate is provided at the upper end of the second U-shaped plate for clamping the chuck on the brake of the fatigue testing mechanism. The other end of the panel of the U-rib model extends into the groove of the second U-shaped plate and is fastened by fasteners.

7. The equivalent fatigue testing device for the U-rib weld of a steel bridge according to claim 1 or 2, characterized in that: The web fixing mechanism includes an inclined plate, and multiple elbow plates are fixedly installed on one side of the inclined plate. The web of the U-rib model is fixed to the inclined plate by fasteners.

8. The equivalent fatigue testing device for the U-rib weld of a steel bridge according to claim 7, characterized in that: Multiple elbow plates are arranged in parallel, and each elbow plate is set in a trapezoidal shape.

9. The equivalent fatigue testing device for the U-rib weld of a steel bridge according to claim 1 or 2, characterized in that: Multiple bolt holes are provided on the base plate, which is fixed to the test platform by fasteners.

10. The equivalent fatigue testing device for the U-rib weld of a steel bridge according to claim 1 or 2, characterized in that: The first clamping mechanism and the web plate fixing mechanism are installed in the middle of the base plate.

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