Seismic Response Analysis And Reliability Analysis Of Long-span Continuous Rigid Frame Bridge With High Piers

With the rapid development of transportation infrastructure construction in China,the construction of high pier and long-span continuous rigid frame bridges is more and more,and a large part of them are located in seismically active areas.But the super large bridge is usually in the main traffic road,and its seismic performance must be a problem that engineers pay close attention to.Based on this,this paper considered the effects of random excitation parameters of bridge structures and random vibration,established the bridge structure model and calculate the seismic response by using ANSYS software,through the MATLAB platform program for the failure probability under the earthquake in high pier long-span continuous rigid frame bridge is calculated.The seismic reliability of a continuous rigid frame bridge with main span 180m is analyzed.The results show that this method can effectively calculate the seismic reliability of complex bridge structures.The main work of this paper is as follows:(1)The use of ANSYS software to establish the finite element model of the bridge,selecting the reasonable seismic acceleration power spectrum model as the seismic input,and according to the actual project to select the appropriate power spectrum model parameters,using random vibration theory to analyze the finite element model of the bridge,to get the response power bridge under earthquake spectrum.(2)By comparing the area codes in many countries,select the reasonable bridge failure criterion,the failure probability of the continuous rigid frame bridge under earthquake were obtained by random vibration theory and calculation for the first time beyond the standards,provide the basis for performance based seismic design.(3)The relationship between support vector regression to establish the failure probability of structural parameters and the structure of the bridge,the total probability formula of continuous random variable write failure probability calculation program based on the obtained probability of failure of bridge structure in double randomness under the consideration of uncertainty parameters of bridge structure influence on reliability calculation,makes the calculation results more in line with the actual state of bridge structure.