Seismic Response Analysis of Long-span Cable-stayed Bridges Subjected to Multi-support Excitation
A long-span cable-stayed bridge often has multiple supports separated by certain distances. If a long-span bridge is located in a complex terrain with different local soil conditions ,the spatial variability may result in quantitative and qualitative differences in seismic response as com -pared with those produced by synchronous motion at all supports. Therefore, how to simulate the ground motion propagating in the field soil becomes imperative and crucial. The conditional simulation method proposed by Vanmarcke et al (1993) is adopted in this study for simulating properly-correlated earthquake ground motions at an arbitrary set of closely -spaced points. The absolute ground displacements at the different supports are then used as the essential seismic loading in the dynamic equilibrium equation which is solved by the Newmark direct integration method. The Stonecutters cable-stayed bridge located in Hong Kong is finally taken as an example to illustrate the con -ditional simulation of seismic ground motion and seismic effects on the bridge. The results show that the conditional simulation of seismic ground motion , considering wave-passage effect, incoherence effect and site-response effect, is important to reflect the spatial variability of ground motion. The computed seismic responses , including bending moment, stress, and displacement responses , also show that the spatial variability of ground motion shall be taken into consideration for the seismic re -sponse analysis of long-span cable-stayed bridges with multiple supports.
Yue ZHENG You-Lin XU Liang HU
Department of Civil and Structural Engineering ,The Hong Kong Polytechnic University , Hong Kong
国际会议
5th International Symposium on Environmental Vibration(第五届环境振动国际研讨会)
成都
英文
358-366
2011-10-20（万方平台首次上网日期，不代表论文的发表时间）