钢结构交错桁架体系抗震性能分析-结构工程专业论文.docxVIP

西南交通大学硕士研究生学位论文 第l页 摘 要 钢结构交错桁架体系是建筑钢结构的一种新型结构体系，其在加大侧向刚 度的同时，又能提供大面积的无柱空间，方便了建筑上的灵活布置。交错桁架 结构体系是一种经济、实用、高效的结构体系，发展这样的结构体系符合住宅 建设的发展方向。国内外学者对这种体系进行了一定的理论分析，在国外也有 了不少的工程实践，但在国内尚无工程实例。对于我国这样一个地震多发区， 研究其抗震性能具有一定的理论意义和应用价值。 本文在总结和吸取前人研究成果的基础上，针对钢结构交错桁架体系的整 体抗震性能进行研究。本文采用ETABS软件建立了多层(6层)和小高层(12 层)两种钢结构交错桁架体系三维结构模型并区分桁架落地与不落地不同的情 况，并分析了不同模型在地震作用下结构反应的异同。采用反应谱法和弹性时 程分析法对各模型的动力特性及动力反应进行分析，得出多层及小高层结构的 抗震薄弱部位均位于结构下部的结论。 本文重点采用Pushover方法对结构进行分析，研究不同的桁架情况和不同 的抗震设防情况下，交错桁架结构的承载力情况、变形情况以及塑性铰出现规 律，并得出不同情况对交错桁架结构的影响规律，指出在该类型结构设计时应 注意优化桁架腹杆截面并对下部柱适当加强。 通过本文的分析可知，钢结构交错桁架体系具有良好的抗震性能，值得 在我国大力推广使用。 【关键词】 钢结构交错桁架体系钢结构静力弹塑性分析抗震性能  AB STRACT The staggered truss system is a new concept in structural steel flaming for buildings．The system consists of a series of story-high trusses spanning the total width between two rows of exterior columns and arranged in a staggered pattem on adjacent column lines．The system was developed to achieve a more efficient structural frame to resist lateral loads and at the same time provide versatility of floor layout with large column．free areas． It has been applied abroad more and more widely in recent years．It is well known that China is a country with much active earthquake．So it is of significance and value to study the seismic behavior． In this paper,we’11 analyze former research results systematicly and scientificly, absorb their excellences，explore the earthquake-resistance capability of staggered steel truss system．This article not only builded up two 3-D models on staggered steel truss system by ETABS，a 6-floors building and a 1 2一floors，but also distinguish the differences between the fall·to-ground struss and not fall．to．ground one；what’S more， analisised the structures of different models affected by earthquake． Aflering compared the dynamic characteristics and dynamic response with these models by response spectrum and elasticity time interval methond， this article shows that the bottom of the model is weak，either the 6-floors mo(1e