Bending Tension Fatigue Characteristics and Structural Optimization of Steel Box Arch with Two-way Tilting Boom Anchoring Connection Structure
The boom is an important stress-bearing component of a bowstring arch bridge.In order to analyze the fatigue characteristics of vehicle-induced vibration bending tension of the two-way tilting boom anchor connection structure during service,based on a 1-188 m span spatial mesh boom steel box bowstring arch bridge,and by establishing 3D finite element bridge model and double-shaft vehicle simplified model,the truss and beam element are used to simulate the boom,which solve the vehicle-bridge coupling vibration of boom under the unevenness of the bridge deck The results indicate that the stress value of the short boom at the beam end of each boom of the bridge is relatively high,and the stress value of the long boom at the mid span reaches its maximum.The stress amplitude in the direction of the mesh boom towards the beam end is greater than that towards the bridge span direction.The outer and inner corners of the anchoring end face under the same boom are approximately 2.3 and 1.7 times that of the upper anchoring end.To adapt to the deformation of the external corner it is recommended to adjust the diameter of the ear plate hole on the beam and the fork ear hole at the lower end of the boom accordingly Compared to the truss element,the damage degree calculated by beam element simulation boom is greater,and the boom in mid-span area is more prone to fatigue damage.
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