扩翼式连接钢框架抗震性能试验研究  

Experimental Study on Seismic Performance of Steel Frames with Widened Beam Flange Connections

作　　者：王燕[1] 王玉田[1] 郁有升[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《建筑钢结构进展》2013年第1期8-14,64,共8页Progress in Steel Building Structures

基　　金：国家自然科学基金(51078194;51278259);教育部高等学校博士学科点专项基金(20103721110003)

摘　　要：为了深入研究扩翼式连接钢框架的抗震性能,设计制作了一榀1∶2缩尺比例的两层扩翼式连接钢框架,采用试验和有限元分析方法研究了扩翼式连接钢框架在低周往复水平荷载作用下的荷载-位移滞回性能、刚度及强度退化、塑性铰变形能力、耗能以及破坏模式等抗震性能。研究结果表明,扩翼式连接钢框架在低周往复水平荷载作用下,塑性铰自梁柱连接焊缝位置移出,塑性铰中心在扩翼段变截面以外位置形成,达到保护梁端连接焊缝防止发生脆性断裂的延性设计目标;扩翼式连接钢框架的荷载-位移滞回曲线表现出较好的塑性变形和耗能能力;进入屈服后随荷载增加受二阶效应影响结构的强度退化呈加快趋势;梁端翼缘截面扩大后,梁端承载力相应提高,但节点域刚度有所降低,设计中应采取构造措施对节点域进行补强,避免出现"强梁弱柱"现象。In order to study deeply the seismic performance of widened beam flange connections,a specimen of 1∶2 scale ratio of a two-story steel frame with widened beam flange connections is designed and made.Using test and finite element analysis methods,the seismic performance of the hysteretic loops of load-displacement,stiffness and strength degradation,plastic hinge deformation capacity,energy dissipation and failure modes of steel frame with widened beam flange connections under low cyclic load are studied.Results of the research show that under low cyclic load,the plastic hinges of steel frames with widened beam flange connections can be moved out of the beam-column connection welding,the centers of plastic hinges locate outside the widened arc part,achieving the ductile design goals that avoid the brittle crack near the welding seam at the end of the beam.The load-displacement plastic hysteretic curve shows good performance of plastic deformation and energy dissipation.After yielding,due to impact of the second-order effect the strength degradation of the structure accelerates with the increasing of the loads.The bearing capacity of the steel frame with widened beam flange connections has been improved,but the stiffness of the column web domain is relatively lower.So construction measures should be taken to reinforce the column web domain during designing to avoid 'strong beam weak column' phenomenon.

关 键 词：钢框架 扩翼式连接 试验研究 滞回性能 抗震性能 

分 类 号：TU391[建筑科学—结构工程] TU352.1