焊接栓钉型钢混凝土柱压-扭复合受力滞回性能试验研究  

Test study on hysteresis performance of welded stud steel reinforced concrete column under compression-torsion composite stress

作　　者：陈宇良[1,2,3] 刘凯格 吉云鹏 叶培欢 CHEN Yuliang;LIU Kaige;JI Yunpeng;YE Peihuan(College of Civil and Architectural Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Engineering Research Center of Assembly Structure Safety Prevention and Control,Liuzhou 545006,China;Guangxi Higher Institution Key Lab of Disaster Prevention&Mitigation and Prestress Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006 [2]广西壮族自治区装配结构安全防控工程研究中心,广西柳州545006 [3]广西高校防灾减灾与预应力技术重点实验室,广西柳州545006

出　　处：《振动与冲击》2024年第17期123-131,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(52368013,51908141);广西重点研发计划项目(2023AB01174)。

摘　　要：为研究焊接栓钉型钢混凝土(stud steel reinforced concrete, SSRC)柱的抗扭性能,提出了6种栓钉布置形式(翼缘、腹板、对称、交错、单双、X型),通过7根SSRC柱和1根型钢混凝土(steel reinforced concrete, SRC)柱的压扭低周反复试验,研究了SSRC柱在压扭复合受力作用下的受力性能。试验观察了SSRC柱在压扭复合受力状态下的破坏形态,揭示了其受扭破坏机理,对比分析了轴压比和栓钉布置形式对试件扭矩-扭转角滞回曲线、骨架曲线、刚度退化、扭转耗能及延性性能的影响规律。结果表明:在压扭复合受力状态下,SSRC柱的扭矩-扭转角滞回曲线呈“S”形,扭转裂缝倾角介于45°~60°之间且随轴压比增大而增大;6种栓钉布置形式均可有效延缓SSRC柱的受扭开裂,腹板焊接栓钉后试件的抗扭承载力提高11.9%;增大轴压比可有效提高SSRC柱的初始抗扭刚度和耗能能力,但会降低其扭转变形能力;栓钉“对称”、“腹板”、“X型”布置时SSRC柱的扭转累积耗能分别提高约16.4%、11.8%、10.2%;综合对比各项指标发现,栓钉“对称”布置对型钢混凝土结构压扭性能的改性效果最佳。Here,to study torsional performance of welded stud steel reinforced concrete(SSRC)columns,6 types of stud arrangements of flange,web,symmetrical,staggered,single and double as well as X-shaped were proposed.load-bearing performance of SSRC columns under compressive-torsional composite stress was studied through compressive-torsional low cycle repeated tests for 7 SSRC columns and 1 steel reinforced concrete(SRC)column.Failure modes of SSRC columns under compressive-torsional composite stress were observed in tests to reveal their torsional failure mechanism.Effects of axial compression ratio and stud arrangement on torque-torsion angle hysteresis curve,skeleton curve,stiffness degradation,torsional energy dissipation and ductility performance of specimens were analyzed contrastively.The results showed that under compression-torsion composite stress state,torque-torsion angle hysteresis curve of SSRC column exhibits a“S”shape,and inclination angles of torsion cracks are between 45°and 60°,they increase with increase in axial compression ratio;6 types of stud arrangements all can effectively delay torsional cracking of SSRC columns,and torsional load-bearing capacity of specimens after studs are welded on web plate increases by 11.9%;increasing axial compression ratio can effectively improve initial torsional stiffness and energy dissipation capacity of SSRC columns,but it can reduce their torsional deformation capacity;torsional cumulative energy dissipations of SSRC columns increase by about 16.4%,11.8%and 10.2%,respectively when studs are arranged in symmetrical,web and X-shaped manner;comprehensive comparison of various indexes reveals stud symmetrical arrangement having the best modification effect on compressive-torsional performance of SRC structures.

关 键 词：压扭性能 焊接栓钉 栓钉布置形式 型钢混凝土(SRC)柱 滞回性能 

分 类 号：TU398[建筑科学—结构工程]