Analysis Method for Crack Propagation of Joints in Slab Girder Bridges Based on Coupled Vibration of Random Traffic Flow-bridge System
To investigate the crack propagation behavior of joints in slab girder bridges under long-term loading of random traffic flow,this study proposes a method for analyzing the fatigue crack propagation behavior of joints in plate girder bridges based on coupled vibration analysis of a random traffic flow-bridge system.Firstly,a random traffic flow simulation model was established based on the Monte Carlo method.Secondly,a method for analyzing coupled vibration between random traffic flow and bridges was established based on the vehicle-bridge coupling theory.Finally,using the Paris fatigue crack propagation model,the fatigue crack propagation behavior of the joints was investigated.The crack propagation law was explored by considering a slab girder bridge on a highway as an example.The results showed that the expansion of cracks in the joints of hollow slab girder bridges under random traffic flow was mainly due to fatigue cracking of the lower concrete under tension.In practical engineering,attention should be paid to the health status of joints closer to the centerlines of overtaking lane and carriageway.The crack propagation rate of the joint increased with the vehicle weight,number of overloaded vehicles,and the initial crack height.
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