Comparative Analysis Of Bridge Response Under The Load Of Custom Transport Vehicle And Ordinary Heavy Truck And Evaluation Method Of Fast Traffic

As one belt,one road,regional cooperation strategy is proposed and promoted,large national key construction projects are gradually developing towards clustering,intellectualization and high-end.The key equipment such as air separation unit,reactor tank,generator unit,chemical tower,pressure transformer and so on are increasingly showing the trend of overweight and super large scale.In order to find out the response difference of the bridge under the load of the heavy vehicle and the heavy vehicle,and to evaluate the bridge passing by the heavy vehicle quickly,firstly,based on the measured data,the vehicle and mechanical parameters of the heavy vehicle and the heavy vehicle are compared,and the representative vehicle types and mechanical parameters of the heavy vehicle and the heavy vehicle are selected;Secondly,the coupling vibration analysis module of the finite element analysis software bdans developed by the research group is used to compare the response difference of the hollow slab bridge under the action of the heavy truck and the heavy truck;Finally,on the basis of the analysis results,the target reliability index of the bridge under the action of the heavy truck load is determined and evaluated.The main tasks are as follows:1 Through the measured data,the representative models of heavy and heavy vehicles are selected,and the time distribution law,driving lane distribution,driving speed,vehicle mass,axle mass and vehicle length of the heavy and heavy vehicles are compared and analyzed.The characteristics and rules of the heavy and heavy vehicles are summarized,which provides an important basis for the later establishment of the mechanical parameters required for the dynamic vehicle bridge model;2 Through the comparison of the responses of Jumbo and jumbo through the hollow slab bridge,it is concluded that from the view of the most unfavorable effect of bending moment,except that the most unfavorable effect of pc10-16 m hollow slab is controlled by the load of jumbo,the rest is controlled by the load of jumbo;the most unfavorable effect of displacement is controlled by the load of jumbo;the most unfavorable effect of shear force RC hollow slab beam is controlled by the load of Jumbo and PC Hollow Slab The beam is controlled by the load of the cart;3 The target reliability index of the bridge under the serviceability limit state is determined as follows: in order to ensure the 95% confidence result under the condition of sampling error,it is suggested to control the bridge with the failure probability of 0.05,the corresponding target reliability index is 1.645,and the critical ratio of the load effect of the large transport vehicle to the design vehicle is 1.282;4 Combined load limit and reliability inversion,the fitting relationship between the critical ratio of the load effect and design vehicle load effect and the reliability index of the stress target is put forward,which provides a new idea for the fast evaluation of the large vehicle crossing the bridge.