Seismic Reliability Analysis of the Basket-handle Arch Based on the Response Surface Method

Seismic reliability is very important to the seismic design of the bridge.Based on theory of the response surface of random vibration and response spectral method,an algorithm for the seismic reliability analysis of the structure with random parameters is proposed in this paper.The seismic reliabilities of the basket-handle arch subjected to seismic excitation in its design basic period are studied.The random of the structure parameters and the site condition of this bridge are taken into account when the arch ribs' failure seismic reliabilities are computed respectively at the low-level earthquake,design earthquake and high-level earthquake.According to the three-level seismic fortification criterion in the code for seismic design of bridge,the seismic reliabilities of the arch ribs are calculated in their design basic period.The conclusion shows that the design of this bridge meets the demands of the seismic code.