土-偏心结构平扭耦联弹塑性反应参数全过程分析  

The Whole Process Analysis on the Lateral-torsional Coupling Elastic-plastic Behavior of Soil-eccentric Structure Interaction System

作　　者：姜忻良[1] 李江存[1] 姜南[1] 

机构地区：[1]天津大学建筑工程学院,滨海土木工程结构与安全教育部重点实验室,天津大学,天津300072

出　　处：《震灾防御技术》2016年第3期493-504,共12页Technology for Earthquake Disaster Prevention

基　　金：国家自然科学基金项目(51278335);国家自然科学基金项目(51478312);国家青年科学基金项目(51208356)

摘　　要：为了了解在强震作用下偏心结构平扭耦联效应,对土-偏心结构相互作用体系进行了平扭耦联弹塑性反应参数弹塑性分析。本文建立考虑SSI的单层单向偏心结构模型,将地基土假定为弹簧,通过拉格朗日能量法推导了结构体系的动力特性方程,采用静力弹塑性(Pushover)分析方法,利用MATLAB软件编程,分析了土体和结构均由弹性到弹塑性的变化对相互作用体系和上部结构的影响,以及体系由弹性到弹塑性平扭耦联效应的变化过程,发现土体由弹性进入塑性对体系的动力特性影响很大,并且得到了相互作用体系相对振型频率随扭平频率比和偏心率的变化规律。In order to understand the lateral-torsional coupling effect of the eccentric structure under strong earthquakes, the elastic and plastic analysis of the lateral-torsional coupling elastic-plastic behavior of soil- eccentric structure interaction system is carried out. In this paper, one-way eccentric structure model of soil structure interaction is established, and the soil is assumed to be the spring. The Lagrange energy method is used to deduce the equation of dynamic characteristics of structure system. The pushover analysis method and MATLAB programming is used to analyze the impact of such change caused by the elastic to plastic on the interaction system and the upper structure. We also analyze the change process of the lateral-torsional coupling effect when system from the elastic to the elastic plastic. The change of the soil from elastic to plastic has great influence on the system dynamic characteristic, and we obtain the variation law of the frequency and the eccentricity.

关 键 词：弹塑性分析 土与结构相互作用 偏心结构 全过程 平扭耦联效应 

分 类 号：TU313[建筑科学—结构工程]