基于传力路径的平面不规则RC框架结构减震设计  

Energy Dissipation Design of an Irregular-plane RC Frame Structure Based on the Load Path

作　　者：杜永峰[1,2] 张文丽[1] 黄小宁[1] 

机构地区：[1]兰州理工大学防震减灾研究所,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《地震工程学报》2017年第3期404-410,424,共8页China Earthquake Engineering Journal

基　　金：国家自然科学基金项目(51578274)

摘　　要：针对平面不规则RC框架结构,从构件安全层次出发提出基于传力路径的减震设计方法。首先根据广义结构刚度法的基本原理计算结构中所有构件的重要性系数,再假定消能支撑的截面参数,取每层最重要的构件位置布置支撑,经支撑在最不利地震组合下的轴力验算后确定支撑的最终设计参数和数量,然后考虑远场、近场有脉冲以及近场无脉冲地震动从双向输入对结构响应的影响,对减震前、后结构分别进行动力时程分析。分析结果表明,利用此方法优化布置支撑能为结构中重要构件提供有效保护,且在小、中、大震下消能支撑均能运作良好,使整体结构响应得到很好地控制。After many years of development,researchers have begun to realize that the traditional seismic design method of using the plastic deformation and damage of the structure itself to dissipate seismic energy could no longer meet safety and economic requirements.Thus,energy dissipation technology has become a hot issue in the field of seismic building designs.Many design methods have been proposed,such as the energy dissipation design based on equivalent linearization,displacement,and energy.Most of the proposed designs,however,are based on the perspective of the whole structure.However,the safety of the most integral parts is ignored.Thus,for the sake of protecting such parts of a structure,some suggestions for the application of energy dissipation design method are given in this work in the form of an optimal allocation method of energy dissipation brace based on the load path.Specific design steps of this energy dissipation method are listed in this paper.The most integral parts of a structure transfer the main load in load path.When these parts are damaged,such damages can have a huge effect on the structural safety of an entire building.First,we simulate an irregular-plane RC frame structure using a finite element modeling software.Then,we use the basic principle of Generalized Rigidity method to calculate the importance coefficients of all elements found in a structural system.Second,we assume the energy dissipation brace section parameters and then arrange the braces in these locations,such that the element importance coefficients are maximized on each floor.Third,we check the final brace parameters after checking the axial forces in the most unfavorable conditions while considering seismic response.Next,we use dynamic time history analysis method to analyze the irregular-plane RC frame structure.In this process,three different seismic conditions divided by the earthquake fault distance are considered,including far-field ground motions,nearfield ground motion with pulse,and near-field ground motion without pul

关 键 词：不规则结构 传力路径 减震设计 构件重要性系数 广义结构刚度法 

分 类 号：TU352.11[建筑科学—结构工程]