强震区混合梁独塔斜拉桥纵向抗震设计  

Longitudinal Seismic Design of Hybrid Beam Single Tower Cable-stayed Bridge Under Strong Earthquake

作　　者：何沁洲 贺金海 袁万城 HE Qin-zhou;HE Jin-hai;YUAN Wan-cheng(Guangdong Baohui Construction Engineering Co Ltd,Shantou 515041,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]广东保辉建筑工程有限公司,广东汕头515041 [2]同济大学土木工程学院,上海200092

出　　处：《土木工程与管理学报》2020年第2期83-86,共4页Journal of Civil Engineering and Management

基　　金：国家自然科学基金(51778471)。

摘　　要：强震区混合梁独塔斜拉桥的梁体质量大,对结构体系的抗震性能要求高,合理选择纵桥向的抗震体系尤为重要。以89+245+185 m的独塔斜拉桥新津河大桥为研究对象,建立了有限元模型,通过非线性时程分析,比较了固结、飘浮、弹性索体系的结构地震内力与位移响应,在此基础上提出了弹性索与拉索减震支座组合设计方案。结果表明:塔梁设置弹性索有利于控制主塔内力与地震位移,弹性索与拉索减震支座组合设计方案可充分利用桥墩的抗震能力,进一步有效控制地震位移,提高全桥的整体抗震性能。In the strong earthquake area,the beam mass of the hybrid beam single tower cable-stayed bridge is large,which requires high seismic performance of the structural system.It is especially important to choose the seismic system of the longitudinal bridge.Taking the 89+245+185 m single-tower cable-stayed bridge Xinjinhe Bridge as the research object,the finite element model was established.Through the nonlinear time history analysis,the seismic internal force and displacement response of the consolidated,floating and elastic cable systems were compared.On this basis,the combination design system of elastic cable and cable-sliding friction aseismic bearing is proposed.The results show that the elastic cable of the tower beam can better control the internal force of the main tower and the displacement of the main beam.The combination design of the elastic cable and cable-sliding friction aseismic bearing can make full use of the seismic capacity of the pier,further control the seismic displacement and improve the seismic capacity of full bridge.

关 键 词：强震区 混合梁独塔斜拉桥 弹性索 拉索减震支座 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]