广东金马大桥多点非平稳随机激励下地震响应研究

Non-Stationary Random Excitations Seismic Response of Jinma Bridge in Guangdong

摘要: 以广东金马大桥的独塔混凝土斜拉桥与T构协作体系为工程算例，对协作体系桥在P波、SH波、SV波的激励下非平稳激励情况下的随机地震响应进行分析，在计算过程中并引入高效虚拟激励法和精细时程积分，计算了主梁、主塔的峰值响应包络，并对地震动空间效应对金马大桥这样的协作体系桥的地震反应影响规律作了讨论，方法高效，计算结果的精度能满足工程要求，可以为同类工程所参考。

Abstract: This paper takes Jinma Bridge in Guangdong with the concrete cable-stayed bridge tower and T shape sys- tem as an engineering example. Under P wave, SH wave, and SV wave excitations of random earthquake response, the girder and pylon peak response envelope of non-stationary excitation are mainly calculated by the efficient virtual excitation method and the precise time-integration method. This method is high efficient and the precision of the result meets require of engineering, which can be referred for similar engineering. In addition, the spatial variation of ground motion on the bridge with the cooperation system bridge under seismic response effect of regulations is discussed.