System and method for testing fatigue strength of corrugated steel web steel girders

A technology for detecting waveform and fatigue strength, applied in the direction of strength characteristics, using repetitive force/pulsation force to test the strength of materials, measuring devices, etc., can solve the problem of fatigue damage that the local force state does not match the actual situation, and avoid fatigue damage. , easy to replace, widely used effect

Active Publication Date: 2015-08-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that when the existing fatigue testing machine is used to clamp the welded corrugated steel web steel beam test piece and detect the fatigue strength of the welded part of the steel flange plate and the corrugated steel plate, it is easy to cause the local stress state to be different from the actual situation. Inconsistent and premature fatigue failure problems, a system for testing the fatigue strength of corrugated steel web steel beams is pro

Method used

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  • System and method for testing fatigue strength of corrugated steel web steel girders
  • System and method for testing fatigue strength of corrugated steel web steel girders
  • System and method for testing fatigue strength of corrugated steel web steel girders

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Example Embodiment

[0023] Example 1:

[0024] Such as figure 1 As shown, the system for detecting the fatigue strength of corrugated steel web steel beams includes a fatigue testing machine 6, where the fatigue testing machine 6 is provided with an upper clamping system 4 and a lower clamping system 5, and the lower clamping system 5 is located on the upper clamping Right below the system 4, the upper clamping system 4 and the lower clamping system 5 are both connected with two chucks 1. The two chucks 1 connected by the upper clamping system 4 have the same level and the clamps of the two chucks 1 The holding ends are directly opposite, the area between the two chucks 1 connected by the upper clamping system 4 is the bayonet that accommodates the upper end of the steel flange plate 2. The two chucks 1 connected by the lower clamping system 5 have the same horizontal height and The clamping ends of the two chucks 1 are directly opposite, and the area between the two chucks 1 connected by the lower ...

Example Embodiment

[0027] Example 2:

[0028] This embodiment is further improved on the basis of embodiment 1. In order to facilitate intelligent control, the system for detecting the fatigue strength of corrugated steel web steel beams in this embodiment also includes an actuator 7, a sensor 8, and a main control box 9. And the computer system 10, where the sensor 8 is a force and displacement sensor, the actuator 7 is connected to the upper clamping system 4, and the main control box 9 is connected to the actuator 7, the sensor 8 and the computer system 10 through three data lines, respectively. The system of this embodiment is used to detect the fatigue strength of the corrugated steel web steel beam. The control and corresponding recording of the applied force are performed in the computer system 10. The specific process is: the computer system 10 sends out a control signal, and The signal conversion is performed by the main control box 9, and the loading signal is transmitted to the actuator ...

Example Embodiment

[0029] Example 3:

[0030] Such as image 3 As shown, this embodiment is further improved on the basis of Embodiment 1 or Embodiment 2. The chuck 1 of this embodiment includes a chuck body 101, a middle clamping block 102 and a side clamping block 103, wherein the chuck The main body 101, the middle clamp block 102 and the side clamp block 103 all have one end surface constituting a slope, and the inclination angles of the three slopes are equal. There is no gap between the slope of the middle clamp block 102 and the slope of the side clamp block 103 and the slope of the chuck body 101 Contact, the middle clamping block 102 and the side clamping block 103 have a cross section of a right-angle trapezoid along the cross section of the vertical chuck body 101, the middle clamping block 102 and the side clamping block 103 are arranged at a certain distance, and the middle clamping block The area between 102 and the side clamping block 103 is a gap in the chuck 1 for accommodating th...

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Abstract

The invention discloses a system for detecting the fatigue strength of a steel beam of a corrugated steel web. The system comprises a fatigue testing machine (6), wherein the fatigue testing machine (6) is provided with an upper clamping system (4) and a lower clamping system (5), the upper clamping system (4) and the lower clamping system (5) are respectively connected with two chucks (1), an area between the two chucks (1) connected with the upper clamping system (4) is provided with a bayonet for containing the upper end of a steel flange plate (2), an area between the two chucks (1) connected with the lower clamping system (5) is provided with a bayonet for containing the lower end of the steel flange plate (2), and a notch capable of containing a flat section of a corrugated steel plate (3) is formed by the chucks (1). The invention also discloses a method for detecting the fatigue strength of the steel beam of the corrugated steel web by adopting the system. When the system and the method are adopted for clamping and welding the steel beam of the corrugated steel web and detecting the fatigue strength of welding parts, the actual stress state can be well reflected, unreasonable fatigue damage can be early avoided, and then the fatigue strength of the welingd parts can be correctly measured.

Description

technical field [0001] The invention relates to the field of steel structure tests, in particular to a system and a method for detecting the fatigue strength of corrugated steel webs and steel girders. Background technique [0002] Welded corrugated steel web steel girder is mainly welded by corrugated steel plate and steel flange plate. Since the corrugated steel plate itself has the characteristics of free expansion and contraction similar to the accordion effect under the action of longitudinal tension deformation, the steel flange under fatigue load The welded part of the plate and the corrugated steel plate is prone to fatigue damage, so the fatigue strength of the welded connection directly affects the durability of the corrugated steel web steel girder, and testing the fatigue strength of the welded connection is especially important for practical engineering. [0003] The chucks of the existing fatigue testing machine are single contact surfaces of a single clamp blo...

Claims

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Application Information

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IPC IPC(8): G01N3/32G01N3/04
Inventor 王志宇王清远
Owner SICHUAN UNIV
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