基于地震易损性的斜拉桥斜置式黏滞阻尼器参数优化

摘要

To obtain the reasonable parameters of inclined viscous dampers for the long-span cable-stayed bridge, a seismic vulnerability analysis method that is developed based on the full probability theory is proposed. In this method, the random distribution characteristics of the structural seismic responses of a cable-stayed bridge is comprehensively considered, and the seismic vulnerability surfaces of parameters of viscous dampers installed along the length and width of the cable-stayed bridge can be simultaneously established. With the minimum seismic vulnerability of a bridge as the objective function, the variation of vulnerability curves along the bridge length and width is analyzed and the parameters are optimized, based on which the reasonable parameters of the inclined viscous dampers are obtained. The method has been practiced in the parametric optimization design of inclined viscous dampers of the Second Wuhu Changjiang River Highway Bridge (with a main span of 806 m). It is shown that the seismic vulnerability analysis method for the cable-stayed bridge based on the full probability theory gives a comprehensive consideration of seismic responses of the bridge structure, and can be applied to perform parametric optimization design of the inclined viscous dampers in accordance with the design targets. In the Second Wuhu Changjiang River Highway Bridge, the viscous dampers incline a degree of 26. 3°to the deck, and the damping coefficient is 3 213 kN ? (m/s)-0.26. ? 2023 Wuhan Bridge Research Institute.

关键词