基于能量平衡规律研究低层钢框架结构损伤分布机理  

Application of the Energy Balance Law to Analysis the Distribution Mechanism of the Damage of the Low-rise Steel Frame Structure

作　　者：包恩和[1] 曹邕生 周月娥[1] 

机构地区：[1]桂林理工大学,广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《应用基础与工程科学学报》2017年第2期332-346,共15页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(51409051,51368014);广西自然科学基金项目(2014GXNSFBA118256);广西矿冶与环境科学试验中心资助项目(KH2012YB027)

摘　　要：针对低层钢框架损伤分布机理不明确,以钢框架的强柱系数、柱脚形式及首层剪重比为主要研究参量,建立16个典型低层钢框架模型;通过强震作用下的弹塑性时程分析,基于能量平衡原理研究低层钢框架楼层以及构件的损伤分布机理.研究结果表明:罕遇地震输入能量的80%以上靠钢框架构件塑性变形来吸收;低层钢框架首层变形集中,为防止首层破坏,柱脚刚接时强柱系数要求1.7以上,柱脚铰接时,建议强柱系数大于2.当强柱系数大于3时,各层层间位移分布基本均匀,然而刚接梁地震需求性能增大,在设计中对梁高的控制及梁柱节点连接的工艺要求较高.Aiming to the fact that it was still ambiguous for the damage distribution mechanism of low- rise steel frame structure, 16 typical low-rise steel frame models were established based on the main research parameters including strong-column factor, column base form and shear-weight ratio of the first floor. Through elastic-plastic time-history analysis under earthquake, the damage distribution mechanism of the low-rise steel frame structure and component was studied by energy balance law. The results show that more than 80% input energy of severe earthquake is absorbed by the component plastic deformation of steel frame structure; The first floor deformation is centralized for low-rise steel frame, the strong-column factor is not less than 1.7 in order to prevent the first floor damage ; When the column base is hinge joint, the strong- column factor is advised greater than 2. When the strong-column factor is greater than 3, the distribution of inter-story displacement for every floor is nearly balance, however, the seismic performance requirements of rigid-joint column is controlling the height of the beam and joining the increased, the technological requirements of beam-column is also increased.

关 键 词：低层钢框架 强柱系数 输入能量速度换算值 累积塑性延性比 

分 类 号：TU391[建筑科学—结构工程]