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Loading device for out-of-plane deformation fatigue test of web gap between vertical stiffener and wing plate

A fatigue test and loading device technology, applied in the direction of applying stable tension/pressure to test the strength of materials, to achieve the effect of reducing requirements, broad application prospects, and easy disassembly

Active Publication Date: 2016-03-30
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the existing steel bridge out-of-deck deformation fatigue test technology, the present invention proposes a method that can truly simulate the effect of the cross brace on the stiffener in the real bridge, so that the stress behavior at the web gap in the fatigue test piece is consistent with that of the real bridge. Consistent, reliable and accurate test results, low requirements for the test site and loading tonnage, simple operation, convenient disassembly, and low test cost The loading device for out-of-plane deformation fatigue test of the vertical stiffener and the web gap between the flange

Method used

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  • Loading device for out-of-plane deformation fatigue test of web gap between vertical stiffener and wing plate
  • Loading device for out-of-plane deformation fatigue test of web gap between vertical stiffener and wing plate
  • Loading device for out-of-plane deformation fatigue test of web gap between vertical stiffener and wing plate

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Experimental program
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Embodiment 1

[0023] Such as figure 1 As shown, the loading device for the out-of-plane deformation fatigue test of the web gap between the vertical stiffener and the wing plate in this embodiment is composed of a servo hydraulic actuator 1, a loading beam 2, a connecting assembly 3, a ground anchor 4 and a concrete leveling layer 6 composition.

[0024] The loading beam 2 of the present embodiment is welded into an I-shaped beam by steel plates, see figure 2 , the upper flange plate 2-1 is a rectangular steel plate with a width of 400 mm, a thickness of 40 mm, and a length of 1000 mm, the loading beam web 2-2 is a rectangular steel plate with a width of 200 mm, a thickness of 20 mm, and a length of 1000 mm, and the lower wing The edge plate 2-3 is a rectangular steel plate with a width of 400 mm, a thickness of 40 mm, and a length of 1000 mm. In order to temporarily fix the loading beam 2 on the reaction frame, the left and right ends of the upper flange plate 2-1 of the loading beam 2 ...

Embodiment 2

[0033] The upper flange plate 2-1 of the loading beam 2 in this embodiment is a rectangular steel plate with a width of 250 mm, a thickness of 16 mm, and a length of 500 mm. Rectangular steel plate, the geometric shape and size of the lower flange plate 2-3 and the upper flange plate 2-1 are the same.

[0034] The horizontal top plate of the steel anchor box 4-1 of the present embodiment is a rectangular plate with a width of 250mm, a thickness of 18mm, and a length of 300mm, and the vertical wing plate is a rectangular plate with a width of 150mm, a thickness of 16mm, and a length of 400mm.

[0035] Other components and their connections are the same as those in Embodiment 1.

Embodiment 3

[0037] The upper flange plate 2-1 of the loading beam 2 in this embodiment is a rectangular steel plate with a width of 550 mm, a thickness of 60 mm, and a length of 1500 mm. Rectangular steel plate, the geometric shape and size of the lower flange plate 2-3 and the upper flange plate 2-1 are the same.

[0038] The horizontal top plate of the steel anchor box 4-1 of the present embodiment is a rectangular plate with a width of 400mm, a thickness of 24mm, and a length of 800mm, and the vertical wing plate is a rectangular plate with a width of 450mm, a thickness of 22mm, and a length of 600mm.

[0039] Other components and their connections are the same as those in Embodiment 1.

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Abstract

The invention relates to an external deformation fatigue test loading device for a web clearance plane between a vertical stiffening rib and a wing plate. Two ground anchors for fixing a test piece are oppositely arranged on a concrete leveling layer. The test piece is connected with a loading beam through a connecting assembly. The loading beam is an H-shaped beam. The middle of an upper flange plate is connected with a servo hydraulic actuator. According to the external deformation fatigue test loading device, the test piece is fixed to the ground anchors through high-strength bolts, the servo hydraulic actuator provides two concentrated cyclic loads for the web vertical stiffening rib through the loading beam and the connecting assembly, and the acting force of a cross strut in a steel plate girder bridge on the web stiffening rib can be truly simulated; in addition, due to reasonable simplification, the scale of the test piece is reduced, the test space is saved, the structure is simplified, the requirement for loading shipping tons is reduced, the test piece is high in replaceability and easy to disassemble, a large number of variable parameter tests can be conveniently and economically carried out, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, in particular to the technical field of bridge engineering testing, in particular to a loading device for out-of-plane deformation fatigue testing of web gaps between vertical stiffeners and wing plates. Background technique [0002] Fatigue problems of steel bridges seriously affect the service life of bridges. Studies have shown that about 90% of fatigue cracking problems in steel bridges are caused by out-of-plane deformation or secondary stress at fatigue-sensitive details. In the design of steel bridges, the horizontal connection between the girders is realized through the connection between the cross brace and the vertical stiffener welded to the web of the main girder. Fatigue failures occur in welded details, usually leaving a web gap of tens of millimeters between the vertical stiffener and the tension flange of the main girder. Under the action of the vehicle load, the defle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12
Inventor 王春生翟慕赛全先凯段兰王茜闫生龙孙宇佳魏孟春
Owner CHANGAN UNIV