斜拉桥抖振响应非线性时程分析

摘要

在大跨桥梁抖振响应分析中，时程分析具有其独有的优势。本文利用一系列幅值加权的空间余弦波迭加(WAWS)模拟随机风场，进而计算出抖振力，而自激力则表示为脉冲响应函数与桥梁运动的卷积形式。文中采用含增量动力平衡迭代格式的Newmark-β法进行非线性时程分析，并以南京长江二桥为例进行了数值计算。%Time-domain method plays an important role in buffeting analysis of long-span bridge. In this paper, buffeting forces are based on the wind field simulation of a series of spaced cosine waves with weighted amplitude and self-excited forces are expressed in the convolution form of impulse response functions and bridge motions. A Newmark-β method described in incremental dynamic equilibrium iteration equation is applied in nonlinear calculation. The buffeting response histories of Second Bridge in Nanjing over Yangtze river are calculated by the method described.