单轴对称钢梁截面组合节点的抗震性能试验研究  

Experimental Study on Seismic Performance of Composite Connections with Single Axisymmetric Steel Beam Section

作　　者：徐莹璐 苏耀烜 尚永芳 郝际平[1,2] 郑宏 XU Yinglu;SU Yaoxuan;SHANG Yongfang;HAO Jiping;ZHENG Hong(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance of Ministry of Education(XAUAT),Xi’an 710055,China;School of Civil Engineering,Chang’an University,Xi’an 710061,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]结构工程与抗震教育部重点实验室(西安建筑科技大学),陕西西安710055 [3]长安大学建筑工程学院,陕西西安710061

出　　处：《湖南大学学报（自然科学版）》2022年第9期31-41,共11页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51878541);陕西省自然科学基础研究计划项目(2019JQ-272,2022JM-221);陕西省教育厅专项科研计划项目(19JK0481)。

摘　　要：为减小钢框架梁柱组合节点中梁下翼缘焊缝脆性破坏的风险,提出了采用单轴对称钢梁截面的梁柱组合节点形式,完成了3个1∶2的组合节点试件的拟静力试验研究,分别考虑标准型钢梁截面、上窄下宽且仅梁下翼缘削弱型的单轴对称钢梁截面及仅梁下翼缘扩翼型的单轴对称钢梁截面组合节点试件,对各试件的破坏过程、滞回行为、关键部位的应变发展、耗能性能及延性等进行了详细分析.结果表明:焊缝质量有所保证的组合节点试件其加载点的荷载-位移滞回曲线饱满,具有良好的耗能性能;仅梁下翼缘扩翼型组合节点试件的塑性铰在扩翼板末端的钢梁截面上形成,在梁下翼缘反复屈曲的过程中母材逐渐开裂并向腹板延伸;正弯矩作用下组合梁截面的中和轴靠近梁上翼缘,从而显著加大了梁下翼缘处的应变水平;单轴对称钢梁截面组合节点形式有助于实现梁上塑性铰外移,减小梁下翼缘焊缝处的应变集中程度;实际工程中应切实保证梁翼缘对接焊缝的质量.This paper proposed a beam-column composite connection configuration with a single axisymmetric steel beam section to reduce the brittle failure risk of the lower flange welds.The quasi-static tests of three 1∶2 com⁃posite connection specimens were conducted.The specimens with the standard steel beam section,narrower beam up⁃per flange and wider beam lower flange with weakened the beam lower flanges only,and widened the beam lower flanges only were considered.The failure process,hysteretic behavior,strain development of key sections,energy dis⁃sipation and ductility of each specimen were analyzed in detail.Results showed that composite connection specimens with guaranteed weld quality had full load-displacement hysteresis curves at the loading point,and showed good en⁃ergy dissipation performance.The plastic hinge of the specimen with widened beam lower flanges occurred in the steel beam section at the end of widened flange plates,and the beam lower flange gradually cracked and extended to the steel web in the process of repeated buckling.Under the positive bending moment,the neutral axis of the compos⁃ite beam section was close to the beam upper flange,leading to a large strain level at the beam lower flange.The com⁃posite connection with a single axisymmetric steel beam section was conducive to moving the plastic hinge away from the column face and thus reducing the strain concentration at the beam’s lower flange.The quality of beam flange butt welds should be guaranteed strictly in practical engineering.

关 键 词：组合结构 节点 单轴对称钢梁截面 抗震性能 试验研究 

分 类 号：TU393[建筑科学—结构工程] TU317.1