索杆结构非线性地震反应分析的设计反应谱法

发布时间：2018-01-02 23:44

本文关键词：索杆结构非线性地震反应分析的设计反应谱法　出处：《上海交通大学学报》2016年11期 　论文类型：期刊论文

【摘要】：基于结构体系刚度概念,将索杆体系各主振型的荷载-位移关系表达为等效单自由度(ESDF)体系的受力-变形关系;将ESDF体系刚度表达为其位移的二次函数;运用随机等效线性化方法,将ESDF体系的非线性刚度等效为线性刚度ke,推导得出ke与ESDF体系位移响应d的关系式;联立刚度-位移格式的设计反应谱表达式及ke-d关系式,求解ke及d,得出整体结构地震反应.以六边形索杆结构为例,分别采用本文方法、时程分析法和线性振型叠加法计算结构位移响应,结果表明,本文方法所得结构位移值与时程分析值偏差仅为10.8%,精度明显高于线性振型叠加法.
[Abstract]:The stiffness of the conceptual structure system based on the relationship between load of cable strut system the main vibration displacement is expressed as the equivalent single degree of freedom (ESDF) system of the force deformation relationship; the ESDF system stiffness expressed as a quadratic function of the displacement; using the stochastic equivalent linearization method, the nonlinear stiffness of the equivalent ESDF system for linear stiffness Ke derived Ke and ESDF system of displacement response relation D; design of simultaneous stiffness displacement response spectrum and ke-d format expression formula, for Ke and D, the whole structure seismic response. The hexagonal rod cable structure as an example, this paper adopts the method of time history analysis respectively. Method and linear modal superposition method of structural displacement response, the calculation results show that the time history analysis with only 10.8% deviation between the derived displacement value, accuracy was significantly higher than that of the linear modal superposition method.

【作者单位】：同济大学土木工程学院;
【基金】：国家自然科学基金(51378379)资助项目
【分类号】：TU399
【正文快照】： 索杆结构体系杆件纤细,结构通透,构件布置具有规律性,建筑表现力强,多应用于幕墙、屋盖及景观结构中.该类结构通过对拉索施加预应力获得结构刚度,效率很高,但由于结构应力刚度与结构位移直接相关,在分析成型体系受力变形时,需要考虑几何非线性效应.当索杆结构体系承受地震动激

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