Seismic reliability analysis of rigid frame bridge based on response surface method

Seismic reliability is very important to the seismic design and the study of the bridge.Based on the theory of the response surface of random vibration and response spectrum method,an algorithm for the seismic reliability analysis of the structures with random parameters is proposed.The structural failure criteria and the equations under their limit states are studied and the dynamic reliabilitiy of the high-pier and long-span rigid frame subjected to seismic excitation in its design basic period is computed.The random of the structure parameters and the site condition of this bridge is taken into account when it's failure seismic reliability is computed for the low-level earthquake,design earthquake and high-level earthquake respectively.According to the three-level seismic fortification criterion in the code for seismic design of bridge,the seismic reliabilitiy of the bridge is calculated in their design basic period.The conclusion shows that the design of this bridge meets the demands of the seismic code.