往复荷载作用下中等强度钢材框架组合节点应力分析  

Stress analysis for composite connections with medium-high strength steel under reciprocal load

作　　者：石永久[1] 王元清[1] 奥晓磊[1] 施刚[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《建筑结构学报》2013年第S1期110-116,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(50578083;50708051)

摘　　要：为了研究中等强度钢材框架梁柱组合节点在地震作用下节点受力性能,在4个足尺试件低周往复荷载作用下的破坏试验中,通过合理的应变片布置和位移测量,得到节点各部位的应力分布情况,包括钢梁下翼缘处、组合梁截面应力发展、预埋钢筋以及钢梁与混凝土的滑移等。从试验结果中可以清楚地看到组合节点钢梁下翼缘焊接孔处存在不同程度的应力集中,截面的应变分布基本满足平截面假定,越接近梁柱截面中轴线的钢筋应变越大,同时塑性发展越明显,继而对其地震作用下的表现有了定性的认识,为组合节点抗震设计以及抗震性能的进一步研究提供了必要的试验基础。Four full-size specimens were subjected to destructive test under the low-cyclic reciprocal load to investigate the seismic bearing characteristics of the composite connection with medium-high strength steel in steel frame structures.Based on proper setting and measurement,the plastic stress distribution of the bottom flange of the steel beam and embedded bar,stress development of the composite section,and the slip between steel beam and concrete slab were obtained.It can be obtained from the experimental results that stress concentration phenomenon occurs at the welding holes of bottom flange of steel beams and plane cross-section assumption is almost qualified for the distribution of section strain.Strain will be larger and plastic development is more obvious when the location of steel bar is nearer to the column.Then the seismic performance was qualitatively studied,which can provide necessary data for the seismic design and performance research of the composite connection.

关 键 词：梁柱组合节点 中等强度钢材 应力分布 滑移 

分 类 号：TU391[建筑科学—结构工程]