考虑楼板效应的盖板加强型延性节点钢框架节点区震损与应变发展的对比分析  

CONTRASTIVE ANALYSIS ON DAMAGE PHENOMENA AND STRAIN DEVELOPMENT IN JOINT AREA OF COVER PLATE REINFORCED STEEL FRAME CONSIDERING FLOOR EFFECT

作　　者：厉见芬[1,2] 王燕[1] 陈晓[1] LI Jianfen;WANG Yan;CHEN Xiao(School of Civil Engineering,Qingdao Technology University,Qingdao 266033,China;Changzhou Institute of Technology,Changzhou 213032,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]常州工学院,江苏常州213032

出　　处：《工业建筑》2021年第4期111-117,共7页Industrial Construction

基　　金：国家自然科学基金项目(51278259)。

摘　　要：对考虑楼板效应的盖板加强型延性节点钢框架(CPF)和普通节点钢框架(NSF)振动台试验模型设计、有限元三维分析的关键技术,以及在罕遇地震和超大震作用下节点区的震损、沿不同路径的应变发展进行对比分析。结果表明:采用多精度壳单元并通过耦合楼板与钢梁上翼缘结点的平动和转动自由度来考虑压型钢板钢筋混凝土组合楼盖作用的有限元分析结果与试验结果吻合较好;节点区的震损现象和等效应变发展规律的对比分析结果显示,CPF钢框架能有效地降低梁端应力水平,并把梁端塑性铰外移至远离梁端焊缝部位,实现强柱弱梁、强节点弱构件的梁铰破坏机制,增加结构的耗能能力与承载力。This paper mainly introduced the key techniques of shaking table test model design and finite element modeling for ductile joint reinforced with cover plate(CPF)and normal steel frame(NSF)considering the floor effect;The contrastive analysis and study on the damage phenomena,strain development in the joint area under the action of severe and mega earthquakes.By using multi-precision shell elements and coupling the translational and rotational degrees of freedom between the floor and the beam upper flange,the finite element analysis results were in good agreement with the experimental results.The results of the comparative analysis of the damage phenomena and strain development law in the joint area showed that CPF steel frame effectively moved the plastic hinge away from the welding at the beam end,in this way,beam hinge failure mechanism of strong column and weak beam,strong joint and weak component was realized.The energy dissipation capacity and bearing capacity of the structure were improved.

关 键 词：震损 应变发展规律 楼板效应 有限元建模关键技术 塑性铰 

分 类 号：TU352.11[建筑科学—结构工程] TU391