高强箍筋约束超高性能混凝土方形短柱轴压承载力计算方法  

A CALCULATION METHOD OF AXIAL COMPRESSIVE BEARING CAPACITY FOR SHORT SQUARE COLUMNS OF ULTRA-HIGH PERFORMANCE CONCRETE CONFINED BY HIGH-STRENGTH STIRRUPS

作　　者：姚军锁 邓宗才[1] YAO Junsuo;DENG Zongcai(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学,城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《工业建筑》2021年第2期26-31,共6页Industrial Construction

基　　金：北京市教委科技重点项目(KZ201810005008)。

摘　　要：为研究高强箍筋约束超高性能混凝土(UHPC)方形短柱的轴压承载力计算方法,对9根箍筋约束UHPC方形短柱进行了轴压试验,并结合所收集相关文献数据,在Richart破坏准则的基础上给出了约束UHPC峰值应力计算式,建议了适用于UHPC强度为130~180 MPa、钢纤维体积掺率为1.5%~2%、体积配箍率为1.5%~5.5%的高强箍筋约束UHPC方形短柱的轴压承载力算式,并与中、美设计标准进行对比。结果表明:建立的考虑钢纤维桥联作用及箍筋约束提高作用的承载力算式,其计算值与试验值吻合度较高,按GB 50010—2010《混凝土结构设计规范》预测的约束UHPC承载力比ACI 318-2014《混凝土结构建筑规范要求》保守;UHPC柱拟配置600 MPa以上高强箍筋,以提高约束效果;非螺旋式箍筋约束UHPC方形短柱的箍筋间距上限值可按GB 50010—2010取值。To study the calculation method of axial compressive bearing capacity for ultra-high performance concrete(UHPC)square short columns confined by high-strength stirrups.9 UHPC square short columns confined by stirrups were tested under axial compression,and combined with the collected relevant literature data,the formula for calculating the peak stress of confined UHPC was given on the basis of Richart’s failure criterion.And further suggested a calculation formula of axial compression bearing capacity,which was applicable to the high-strength stirrup confined UHPC square short columns with strength of UHPC ranging from 130 MPa to 180 MPa,steel fiber content ranging from 1.5% to 2% and volume stirrup ratio ranging from 1.5%to 5.5%;the suggested formula was compared with the standard formula of China and America.The results showed that the bearing capacity of UHPC predicted by GB 50010—2010 was more conservative than that of ACI 318-2014.The bearing capacity formula considered the effects of steel fiber bridge and stirrup restraint,and the calculated values were in good agreement with the test values.It was suggested to use high-strength stirrup above 600 MPa to restrain UHPC.The upper limit of the stirrup spacing for UHPC square short column confined by non-helical stirrups could be calculated according to GB 50010—2010.

关 键 词：超高性能混凝土 高强箍筋 轴压承载力 方形短柱 设计标准 

分 类 号：TU37[建筑科学—结构工程]