方钢管超高性能混凝土柱抗震性能试验及数值模拟  

Seismic Performance Test and Numerical Simulation of Square Steel Tube UHPC Columns

作　　者：李慧玮 仵鹏涛 刘中宪 刘国瑞 徐慎春 安凯旋 LI Huiwei;WU Pengtao;LIU Zhongxian;LIU Guorui;XU Shenchun;AN Kaixuan(Tianjin Key Laboratory of Civil Structure Protection and Reinforcement,Tianjin 300384;Computing Center,Tianjin Chengjian University,Tianjin 300384,China;School of Civil Engineering,Guangzhou University,Guangdong 510006,China;Department of Civil Engineering,Changzhi Vocational and Technical College,Changzhi 046000,China)

机构地区：[1]天津市土木建筑结构防护与加固重点实验室,天津300384 [2]天津城建大学计算中心,天津300384 [3]广州大学土木工程学院,广东广州510006 [4]长治职业技术学院土木工程系,山西长治046000

出　　处：《防灾减灾工程学报》2024年第5期1084-1093,1105,共11页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(52308518);天津市企业科技特派员项目(23YDTPJC00100)资助。

摘　　要：钢管混凝土柱因其承载力高、抗震性能良好且施工方便等特点成为建筑结构发展方向之一,但目前对于钢管超高性能混凝土柱抗震性能研究较少。对不同类型方钢管混凝土柱抗震性能(4根方钢管超高性能混凝土柱、1根方钢管高强混凝土、1根方钢管普通混凝土)进行对比分析研究。结合6根方钢管混凝土柱的低周往复试验数据,建立纤维有限元模型进行参数分析。主要研究了在低周往复荷载作用下的破坏形式、滞回曲线、骨架曲线、延性以及耗能能力等,分析了轴压比、含钢率和混凝土种类等主要设计参数的影响规律。结果表明:(1)纤维有限元模型能够有效分析方钢管超高性能混凝土柱滞回特性;(2)与方钢管普通混凝土柱和高强混凝土柱相比,方钢管超高性能混凝土柱抗震性能更为优异;(3)方钢管超高性能混凝土柱随着轴压比的提高,试件水平承载力及刚度增大,但延性降低;随着含钢率的增加,试件水平承载力、刚度、延性及耗能能力均提高;随着钢纤维体积率的增加,试件延性、耗能能力提高。Concrete-filled steel tubular(CFST)columns have become a key development direction in building structures due to their high bearing capacity,good seismic performance,and convenient construction.However,there is currently limited research on the seismic performance of ultra-high performance concrete(UHPC)CFST columns,making further investigation necessary.This paper conducted a comparative analysis of the seismic performance of different types of square CFST columns(4 UHPC square CFST columns,1 high-strength square CFST column,and 1 ordinary square CFST column).Using low-cyclic loading test data from 6 square CFST columns,a fiber finite element model was established to perform a parametric analysis.The study mainly investigated failure modes,hysteresis curves,skeleton curves,ductility and energy dissipation capacity under low-cyclic loading test,and analyzed the influence of main design parameters such as axial compression ratio,steel ratio and concrete type.The results showed that:(1)The fiber finite element model could effectively analyze the hysteretic characteristics of UHPC square CFST columns.(2)Compared to ordinary and high-strength square CFST columns,UHPC square CFST columns exhibited better seismic performance.(3)As the axial compression ratio increased,the horizontal bearing capacity and stiffness of the test specimens increased,but ductility decreased.As the steel content increased,the horizontal load-bearing capacity,stiffness,ductility,and energy dissipation capacity of the specimens all improved.As the volume fraction of steel fiber increased,the ductility and energy dissipation capacity of the specimens were improved.

关 键 词：超高性能混凝土 抗震性能 低周往复试验 纤维模型 

分 类 号：TU398.9[建筑科学—结构工程]