联塔分幅斜拉桥塔结构体系结构行为的分析研究.pdf

西南交通大学硕士研究生学位论文第1页摘要斜拉桥是由塔、梁、索三种基本构件组成的高次超静定柔性结构体系。甬江斜拉桥桥塔采用双塔联体结构,是一种复杂的新型结构形式,本文较系统地研究了这种新型结构形式的结构特点、静力性能、动力特性以及抗震性能,旨在对这种结构从概念上有更深刻的认识,为设计提供依据,并为进一步的研究工作打下基础。本文对有限元分析方法的基本原理进行了阐述,简要分析了对桥梁结构进行分析的有限元方法及有限元软件,并应用Midas软件建立了双塔联体结构的计算模型,双塔联体结构的静力特性、动力特性和抗震分析时均采用了此模型。本文利用Midas进行了甬江大桥桥塔在指定工况下的静力分析,在动力特性方面,把双塔联体结构同一般双塔结构的动力特性作了比较,主要是振动的基频和振型分析,然后对双塔联体结构进行了地震响应分析,深入研究了其在水平地震作用下的受力变形特点,为甬江大桥抗震研究提供依据。本文通过计算,分析得到了一些双塔联体结构基本特性的规律, 对工程设计及后续研究有一定的参考价值。关键词:双塔联体结构;静力特性;动力特性;地震响应;有限元法西南交通大学硕士研究生学位论文第1 T页 I_—————— I●I-lll_l__Il---l_l-_ Ab stract The cable—stayed bridge is akindof indeterminate flexible structure with many redundant degrees offreedom,which consists ofthree basic members:towers, girders and tower ofYongjiang river cable-stayed bridge is the Double—Tower-Connected Structure thatis plex on structuralbehaviors including staticbehaviors,dynamic characteristicsand seismic responses of the Double-Tower-Connected Structures are given systematically in thisthesis,which couldhelp to adeeper understanding ofthebasic conception for the Double—Tower-Connected the thesis also establishes afoundmion forfurther researches and provides areasonable design guideline. The basic element of finiteelement method,especially the bridge stoic analysis offinite element method isexpatimed,and the finiteelement method software for bridge analysis putation model for analyzing theDouble-Tower-Connected Structuressystem hasbeen founded based on software MIDAS,and the presented model isapplied tostudy the static behaviors,dynamic charactenstics and seismic responses of the Double-Tower-Connected staticbehaviors oftheYongj iang river cable·stayedbridge hasbeenanalyzed with finiteelement program MIDAS under specified inthe matter ofdynamic analysis,thedynamic characteristics have pared between thedouble·-towerand theDouble··Tower-Connected Structures,including thebasicfrequency thenthe seism