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对于跨度达数百米甚至千米以上的桥梁抗震计算必须考虑由于地面变形而导致桥梁支座之间的相对运动,亦即要考虑多点不均匀激励。基于上述原因,用通常的反应谱方法无法计算。理论上,可以用随机振动方法来处理,但是将其应用于地震工程界则还是不现实的,除非是对于只有少量自由度和支承的简单结构。2012年2月我院进行南宁市五象大桥施工图设计,本人作为主要参与人和范洪贵负责桥梁抗震设计。作为五象大桥抗震设计的重要内容之一,本文以独塔混凝土斜拉桥与T构协作体系广东金马大桥为工程算例,提出了一种简化支座的协作体系随机地震响应分析计算模型,大大提高了计算效率,比较了简化计算模型和多点随机激励的计算结果,差值在3%以内,可以对南宁市五象大桥基于简化的随机振动方法来处理抗震计算和研究提供参考。
For aseismic calculation of bridges with a span of several hundred meters or more, the relative motion between bridge abutments due to ground deformation must be considered, that is, multi-point inhomogeneous excitation should be considered. For the above reasons, it can not be calculated by the usual method of response spectrum. Theoretically, it can be handled by random vibration method, but it is still unrealistic to apply it to seismic engineering unless it is a simple structure with only a few degrees of freedom and support. In February 2012, our hospital carried out the construction drawing design of Wu Xiang Bridge in Nanning City. I, as the main participant and Fan Honggui, took charge of the seismic design of the bridge. As one of the important contents of the seismic design of Wuxiang Bridge, this paper presents an example of random seismic response analysis and calculation model of the simplified bearing system by taking the single tower concrete cable-stayed bridge and T-structure cooperation system as the example of Guangdong Jinma Bridge. Which greatly improves the computational efficiency. Compared with the simplified calculation model and the result of multi-point random excitation, the difference is less than 3%, which can provide reference for the seismic calculation and research of Nanxiang WuXiang Bridge based on the simplified stochastic vibration method.