Outer-of-face deformation fatigue test loading device for web gap at position of steel bridge horizontal gusset plates

Abstract

The invention relates to an outer-of-face deformation fatigue test loading device for a web gap at the position of steel bridge horizontal gusset plates. The outer-of-face deformation fatigue test loading device is characterized in that two opposite concrete leveling layers are provided with ground anchors for fixing a tested piece respectively, the two force-transmission horizontal gusset plates are arranged on the tested piece in parallel and connected with a loading beam through connecting assemblies, the loading beam is an I-shaped beam, and a servo hydraulic actuator is connected to the middle of an upper flange plate of the loading beam. According to the outer-of-face deformation fatigue test loading device, the tested piece is fixed to the ground anchors through high-strength bolts, the servo hydraulic actuator provides two concentrated cyclic loads for the force-transmission horizontal gusset plates through the loading beam and the connecting assemblies, the true stress of the position of the web gap of the tested piece at the position of the horizontal gusset plates is simulated, and the fatigue testing result is accurate; due to the fact that the scale of the tested piece is reasonably simplified and reduced, testing space is saved, and the requirement for the loading tonnage is lowered; in addition, the tested piece is high in replaceability and easy to disassemble, a large number of tests for variable parameters can be conveniently and economically carried out, and the application prospects are broad.

Description

Technical field [0001] The invention belongs to the technical field of bridge engineering, and particularly relates to the technical field of bridge engineering test, in particular to a load device for fatigue test of the outer deformation of the web gap surface at the horizontal gusset plate of a steel bridge. Background technique [0002] The fatigue problem of steel bridges seriously affects the service life of the bridge. Research has shown that about 90% of fatigue cracking problems in steel bridges are caused by out-of-plane deformation or secondary stress in fatigue-sensitive details. In the design of steel bridges, flat joints are needed to realize the transverse connection between the steel main beams. The parallel connection is welded or bolted to the horizontal gusset plate of each steel main girder. The horizontal gusset plate is usually welded to the web, and is welded or not connected to the vertical stiffener of the web. In order to avoid fatigue failure of the we...

AI Technical Summary

Problems solved by technology

At present, there are many tests on the fatigue performance of orthotropic steel bridge decks, and the commonly used testing techniques have the following deficiencies: (1) The traditional tests on the fatigue mechanism and maintenance and reinforcement methods of steel bridges use large-segment steel beams for testing , model manufacturing and installation are time-consuming and labor-intensive, and the cost is high, it is difficult to realize a large number of variable parameter test research on fatigue details; The force and deformation of the real bridge require a high loading tonnage, and the fatigue test is expensive

However, at present, no one has conducted a large number of variable parameter tests on the fatigue details of the web gap of the horizontal gusset plate of the steel bridge. Moreover, the current loading device for testing the fatigue performance of the steel bridge is difficult to reflect the web gap of the horizontal gusset plate. The actual out-of-plane deformation and stress

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