圆钢管混凝土轴压构件承载力分项系数研究  

Study on partial coefficient of bearing capacity of concrete-filled circular steel tube under axial compression

作　　者：赵振红 邸小坛[1] 刘立渠[1] 张狄龙[1] 崔古月[1] Zhao Zhenhong;Di Xiaotan;Liu Liqu;Zhang Dilong;Cui Guyue(China Academy of Building Research,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院,北京100013

出　　处：《建筑科学》2021年第1期15-22,共8页Building Science

摘　　要：首先简单介绍了从构件承载力极限状态可靠指标中分离出构件承载力可靠指标的方法,并计算得到了不同构件承载力极限状态可靠指标对应的圆钢管混凝土轴压构件承载力可靠指标。利用收集到的234组圆钢管混凝土轴压构件承载力试验数据,分析确定了圆钢管混凝土轴压构件承载力变异系数,按照构件承载力分项系数公式计算确定了该类构件承载力分项系数。最后,将构件承载力分项系数分别与美国规范AISC360-16的钢管混凝土受压柱抗力系数,以及《钢管混凝土结构技术规范》(GB 50936—2014)和欧洲规范EN1994:2004当量构件系数进行了比较。比较结果表明,对于圆钢管混凝土轴压构件而言,当量构件系数与构件承载力可靠指标的关系不大,且明显小于构件承载力分项系数。Firstly,the method of separating the reliability index of member bearing capacity from the reliabilityindex of ultimate state of member bearing capacity is briefly introduced,and the bearing capacity reliability index ofconcrete-filled circular steel tubular members corresponding to different reliability indexes of bearing capacity limitstate is calculated.Based on 234 sets of test data of concrete filled circular steel tubular members under axialcompression,the variation coefficient of bearing capacity of concrete-filled circular steel tubular members underaxial compression is analyzed and determined,and the partial coefficient of bearing capacity of such members iscalculated and determined according to the formula of component bearing capacity.Finally,the partial coefficient ofbearing capacity is compared with the resistance coefficient of concrete-filled steel tubular columns in AmericanCode AISC360-16,the equivalent member coefficient of technical code for concrete filled steel tubular structures(GB50936-2014)and European Code EN1994,2004.The comparison results show that the equivalent componentcoefficient has little relationship with the reliability index of bearing capacity of concrete-filled circular steel tubularmembers under axial compression,and it is obviously less than the partial coefficient of bearing capacity.

关 键 词：钢管混凝土 轴压承载力 长细比 分项系数 可靠指标 

分 类 号：TU398[建筑科学—结构工程]