【摘要】 随着中国基础建设的发展,大跨度斜拉桥越来越在震后救灾生命线中扮演着枢纽的角色。但目前国内外对于斜拉桥抗震性能的研究多集中于纵向飘浮体系的合理约束装置及其参数的选取上。对于斜拉桥横桥向地震反应的研究则鲜有涉及,讨论桥塔造型对于横向地震动影响的更是几乎没有。以实际桥梁为背景,从斜拉桥整体构造的角度,利用非线性时程方法分析了倒Y型、A型、H型及宝石型4种常见斜拉桥主塔塔形对横向地震反应的影响。结果显示,H型桥塔横向抗震性能最优,宝石型桥塔最不利,其余两种桥塔构型介于这两者之间。并且注意到,对于某些构型的桥塔,进行抗震设计时同时需要注意恒载的影响。更多还原

【Abstract】 With fast development of Chinese infrastructure construction,long- span cable stayed bridge is playing a more important role as hub of relief lifeline after earthquake. However,existing researches for seismic response of cable- stayed bridge focus mainly on choosing appropriate restraint devices of longitudinal floating system,and reasonable parameters of them. Among few studies on transverse response of cable- stayed bridge,almost none of them discussed anything about the influence of tower type. Present study,which focused on transverse seismic response,utilized nonlinear time history method to analyze four bridges with common tower types,namely inverted Y type,A type,H type and gem type. The results show that bridge with H type tower performs best in transverse seismic excitation,followed with inverted Y type and A type,while the gem type one ranking the last. It is noted that seismic design should also take dead load into consideration when relating to some certain types of tower.更多还原