【摘要】 基于非线性有限元理论,以某独塔双索面刚构体系斜拉桥为例建立了动力空间有限元模型,对该桥的动力特性进行了研究。在此基础上通过三角级数拟合规范反应谱的方法,合成了适用于结构分析的人造地震波,并以此和两条实际地震记录作为输入地震动,应用时程分析法对比分析了一致激励和行波激励下的结构地震反应。研究结果表明,在考虑纵向+竖向组合作用时,独塔双索面斜拉桥的内力和位移反应比纵向分量单独作用时更为显著;行波效应可以明显减小结构的位移反应,对结构抗震来讲是有利的。以上结论将为此类桥梁的设计和发展提供一定的理论依据。更多还原

【Abstract】 Based on the nonlinear finite element thoery,a dynamic spatial finite element model of a single tower rigid-frame system cable-stayed bridge is built,and its dynamic characteristics is researched.The synthetic accelerograms compatible with the code response spectrum is generated by triangular series method in order to provide a reasonable seismic input for the time-history analysis method of the cable-stayed bridge system.At last the artificial wave and two realistic earthquake records are adopted in order to conduct a comparative analysis of the structural seismic response under the uniform excitation and travelling wave excitation.The results show that the displacement and internal force response of the bridge are more significant under the combined action of the both longitudinal and vertical excitations than that under the only longitudinal direction excitation;furthermore,the wave travelling effect can greatly reduces the structural displacement response,which is favorable for structural seismic resistance.These conclusions mentioned above will provide a theoretical basis for the design and development of such kind of bridges.更多还原