钢结构仿古建筑双梁柱中节点的受力机理  

Mechanical performance of the double beam-column inner joints in steel imitated ancient building

作　　者：薛建阳[1] 戚亮杰 隋龙天 吴占景[1] 许丹[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《土木建筑与环境工程》2016年第1期17-22,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金项目(51208411);中建股份有限公司科技研发课题资助项目(CSCEC-2012-Z-16)~~

摘　　要：为研究钢结构仿古建筑双梁柱中节点的抗震性能,对4个全焊双梁柱中节点进行了水平低周反复加载试验。通过观测试件在侧向力作用下的受力过程和破坏形态,分析双梁柱中节点的受力机理。根据梁截面形式的不同,将其分为箱型截面梁与工字型截面梁2类,依据仿古建筑独特的构造特点,将各试件节点核心区划分为上、中、下3个区域。通过量测各区域内的应变大小,分析该类结构节点核心区在侧向力作用下的受理机理及破坏模式,并建立双梁柱节点的斜压杆受力模型。试验结果表明:仿古建筑双梁柱节点的破坏形式主要为沿下核心区对角线的剪切破坏,并通过理论计算分析提出一种考虑轴压比与梁截面形式的双梁柱中节点抗剪承载力修正公式。We carried out horizontal low cyclic loading tests of four all-welded double beam-column inner joints to study the seismic performance of the double beam-column inner joints of the steel intimated ancient building. We studied the mechanical performance of the double beam-column inner joints according to the loading process and failure pattern of the specimens under the action of lateral forces,and divided the double beam-columns into two kinds,which were the box section beam and I-shaped section beam,according to different section forms of beam.Based on unique structural features of the intimated ancient building,we divided the joint core area of each specimen into three regions,which were upper core zone,middle core zone and lower core zone.By measuring the shear strain within the scope of every area,we analyzed the mechanism performance and failure modes of the joints under lateral forces,and established the diagonal strut mechanism.The experimental results and theoretical analysis show thatthe failure mode of the double beam-column joints of the intimated ancient building is mainly for the shear failure along the diagonal of the lower core area.So we presented a modified formula of shear bearing capacity of double beam-column inner joints considering the axial compression ratio and the cross section of the beams.

关 键 词：仿古建筑 双梁柱中节点 低周反复荷载 受力机理 抗剪承载力 

分 类 号：TU391[建筑科学—结构工程]