截面尺寸和箍筋对RC短柱抗震性能的影响  

Effects of cross-section size and stirrup form on aseismic performance of RC short columns

作　　者：王作虎 侯宪淼 金浏[2] 董振华[3] 邵明哲 WANG Zuohu;HOU Xianmiao;JIN Liu;DONG Zhenhua;SHAO Mingzhe(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;The Key Laboratory of Urban Security and Disaster Engineering,Beijing University of Technology,Beijing 100124,China;Research Institute of Highway,Ministry of Transport,Beijing 100088,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京工业大学城市减灾与防灾防护教育部重点实验室,北京100124 [3]交通运输部公路科学研究院,北京100088

出　　处：《振动与冲击》2024年第21期71-79,共9页Journal of Vibration and Shock

基　　金：国家重点研发计划(2016YFC0701104);国家自然科学基金(51421005;51878028)。

摘　　要：为了研究钢筋混凝土(reinforced concrete,RC)短柱的抗震性能,通过低周反复破坏试验对其抗震性能的尺寸效应进行了分析。试验主要考虑了截面尺寸和箍筋形式的影响,RC短柱的截面分别设计为200 mm×200 mm、400 mm×400 m和600 mm×600 mm,箍筋主要分为普通方形箍筋和井字箍筋。结果表明:配有普通方箍筋的RC短柱均表现出斜拉破坏特征,脆性破坏特征明显,而配有井字箍筋较大尺寸的RC短柱(边长为400 mm和600 mm)为剪压破坏;随着RC短柱截面边长的增加,其名义抗剪强度、延性和平均耗能系数均逐渐减小,并且配有井字箍筋的RC短柱相对于配有普通方形箍筋的短柱,其减小的速率逐渐变小。通过考虑截面尺寸和箍筋的影响作用,提出了修正的RC短柱的抗剪承载计算模型,并建立了考虑尺寸效应的RC短柱恢复力模型,计算结果与试验结果较吻合。Here,to study aseismic performance of reinforced concrete(RC)short columns,the size effect of their aseismic performance was analyzed with low cycle repeated failure tests.Tests mainly focused on effects of cross-section size and stirrup form.Cross-sections of RC short columns were designed to be 200 mm×200 mm,400 mm×400 mm,and 600 mm×600 mm,respectively.The stirrups were ordinary square stirrups and cross shaped stirrups.The results showed that RC short columns with ordinary square stirrups exhibit diagonal tensile failure features and obvious brittle failure features,while RC short columns with larger side lengths of 400 mm and 600 mm and cross shaped stirrups exhibit shear-compression failure;with increase in cross-section side length of RC short columns,their nominal shear strength,ductility and average energy dissipation coefficient gradually decrease;moreover,decreasing rates of RC short columns with cross shaped stirrups gradually decrease compared to those of RC short columns with ordinary square stirrups;a modified shear-bearing ability calculation model for RC short columns is proposed considering effects of cross-section size and stirrup form,and a restoring force model for RC short columns considering size effect is established,their calculation results agree better with test results.

关 键 词：钢筋混凝土(RC)短柱 配箍形式 抗震性能 尺寸效应 恢复力模型 

分 类 号：TU375.3[建筑科学—结构工程]