摘要
为研究高强方钢管超高性能混凝土(ultra-high performance concrete filled high-strength square steel tube,UHPCFHST)柱的抗震性能,以套箍系数、长细比和轴压比为研究参数,对UHPCFHST柱进行低周往复荷载试验。观察试件的破坏形态,分析各参数对试件滞回性能、刚度、延性和耗能能力的影响规律。研究结果表明:所有试件破坏特征均相似,柱底出现钢管鼓曲和混凝土压碎现象。随着套箍系数的增大(套箍系数由0.55~0.98),试件的延性分别提升了8.91%和21.52%。随着长细比的增加,试件的初始刚度、水平承载力和延性下降,长细比越大试件的延性减弱越显著。轴压比由0.1增大到0.2时,试件的初始刚度和水平承载能力提高,而延性下降。同时,将文中承载力试验结果与各规范计算值进行对比分析,美国ANSI/AISC 360—16《钢结构建筑规范》的计算结果较实测低48%,偏于保守,而GB 50936—2014《钢管混凝土结构技术规范》的计算结果较实测高17%,经分析福建省地方标准DBJ/T13-51—2010最为计算与实测最为贴合,为高强方钢管超高性能混凝土柱在低周往复荷载作用下的设计提供参照依据。
In order to study the seismic performance of ultra-high performance concrete filled high-strength square steel tube(UHPCFHST)columns,this paper uses the hoop factor,length-to-slender ratio,and axial compression ratio as the parameters of study to conduct the low cyclic reversed loading test.The damage patterns of the specimens were observed,and the influence of each parameter on the hysteretic properties,stiffness,ductility and energy dissipation capacity of the specimens was analyzed.The test results show that the damage characteristics of all specimens are similar,and the phenomena of steel pipe buckling and concrete crushing appear at the bottom of the column.With the increase of the hoop coefficient(from 0.55 to 0.98),the ductility of the specimens increased by 8.91%and 21.52%,respectively.The initial stiffness,horizontal bearing capacity and ductility of the specimens decrease with the increase of the length-to-slender ratio,and the greater the length-to-slender ratio,the more significant the weakening of the ductility of the specimens.When the axial compression ratio increases from 0.1 to 0.2,the initial stiffness and horizontal bearing capacity of the specimen increase,while the ductility decreases.At the same time,the load-bearing capacity test results in this paper and the calculated values of each specification are compared and analyzed.The calculation results of the United States ANSI/AISC 360—16 AISC specification for structural steel buildings are lower than the measured values by 48%,which is relatively conservative.The calculation results of the GB 50936—2014 technical code for cencrete filled steel tubular structures are higher than the measured values by 17%,After analyzing the Fujian provincial local standard DBT/T13-51—2010 technical specification for concrete-filled steel tube structures,the calculation is the most consistent with the actual measurement,which provides a reference basis for the design of high-strength square steel pipe ultra-high-performance concrete columns under low cyc
作者
秦靖凯
何学杰
张娟
骆志
于子程
杜国锋
QIN Jingkai;HE Xuejie;ZHANG Juan;LUO Zhi;YU Zicheng;DU Guofeng(School of Urban Construction,Yangtze University,Jingzhou 434023,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2024年第6期227-237,共11页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(52078052)。
关键词
高强方钢管
超高性能混凝土
拟静力试验
抗震性能
承载力
high strength square steel tube
ultra-high performance concrete
pseudo-static test
seismic performance
bearing capacity
