外露式钢柱脚力学特性对多层钢框架动力响应机理的影响  

Influence of Mechanical Property of Exposed Steel Column Base on Dynamic Response Mechanism for Multistory Steel Frame

作　　者：陈艳艳[1] 赵亚涛 包恩和[2] 王晓丽 宗剑 庾东 CHEN Yan-yan;ZHAO Ya-tao;BAO En-he;WANG Xiao-li;ZONG Jian;YU Dong(College of Civil Engineering and Architecture,Nanning University 1,Nanning 530200,China;College of Civil Engineering and Architecture,Guilin University of Technology ,Guilin 541004,China)

机构地区：[1]南宁学院土木与建筑工程学院,南宁530200 [2]桂林理工大学土木与建筑工程学院,桂林541004

出　　处：《科学技术与工程》2018年第34期98-105,共8页Science Technology and Engineering

基　　金：广西教育厅科研项目(KY2016YB861);广西自然科学回国基金(2011GXNSFC018004);南宁学院科研项目(2016XJ42)资助

摘　　要：为了研究外露式钢柱脚力学特性对多层钢框架动力响应机理的影响,首先定义外露式钢柱脚滑移型滞回曲线模型,以首层剪重比及钢柱脚强度系数等为主要研究参数,建立6个简单规则的6层钢框架模型;通过时程分析,研究各模型的动力响应。分析表明:在罕遇地震作用下,各模型各层最大层间位移角分布较均匀,外露式钢柱脚强度变化和首层剪重比提高5%等对各模型各层R值的最大值无明显影响。随模型柱脚强度系数减小及首层剪重比提高,首层塑性变形能量比例减小,而3～6层塑性变形能量比例增大;总体上塑性变形能量向各层分散。地震输入能量和结构塑性变形能量的大小与各模型的强柱系数及外露式钢柱脚强度系数等变化无关;主要取决于结构第一周期。钢柱脚滞回曲线动力响应和本文建立的外露式钢柱脚滑移型滞回曲线模型较吻合。To study the influence of mechanical properties of exposed steel column base on dynamic response mechanism of multistory steel frame,the model of slip hysteresis loop for exposed steel column base was defined and 6-layer steel frame models were established based on the main research parameters including the first layer shear-weight ratio and strength factor of exposed steel column base.The dynamic response was studied by time-history analysis.The analysis has shown that under action of rare earthquake,the distribution of maximum inter-storey drift angle of each model is nearly balanceable,there is no obvious influence on the maximum R value of each model s layer by change the first layer shear weight ratio and increasing 5%of strength of exposed steel column base.With the strength factor of exposed steel column base becoming smaller and the first layer shear weight ratio is increasing,the proportion of first floor plastic deformation energy decreases,while the plastic energy of 3~6 layer increases;plastic deformation energy spreads to each layer generally.There is no relationship between the size of earthquake input energy,structural plastic deformation energy and the changes of strong column coefficient of each model as well as strength coefficient of exposed steel column base;it is mainly decided by the first cycle of structure.There is a good agreement between the shape of the hysteresis curve for dynamic response and the proposed model of slip hysteresis loop for exposed steel column base.

关 键 词：钢柱脚力学特性 钢柱脚强度系数 首层剪重比 结构塑性变形能量 

分 类 号：TU391[建筑科学—结构工程]