Long span cable-stayed bridges generally are the key structures of transportation system. Great direct and indirect economic loss will be caused if these bridges getdamaged in an earthquake.
大跨度斜拉桥一般都是交通运输的枢纽工程，一旦在地震中遭到破坏，将会造成巨大的直接和间接经济损失。
This paper is concentrated on the space geometric non-linear static analysis and vibration analysis of the long span plate-truss composite cable-stayed bridges.
本文是针对大跨径板桁结合斜拉桥的空间几何非线性静力分析及结构的动力分析两个方面而展开研究工作的。
So, to study the seismic responses of long-span cable-stayed Bridges with multi-support excitation will be very important to seismic design and seismic safety.
因此，对大跨斜拉桥在多点输入下的反应开展研究，对进行正确有效的抗震设计，确保其抗震安全性具有非常重要的意义。
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