基于面积比的钢管混凝土劲性骨架组合柱承载力  

Ultimate bearing capacity of concrete filled steel tube reinforced concrete columns based on area ratio

作　　者：杨艳[1] 周俊 韦建刚[1,2] 傅斌 吴庆雄 YANG Yan;ZHOU Jun;WEI Jiangang;FU Bin;WU Qingxiong(Fuzhou University,Fuzhou 350108,China;Fujian University of TechnologT,Fuzhou 350118,China;High Way Bureau of Xia＇men City,Xia＇men 361000,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]福建工程学院,福建福州350118 [3]厦门市公路局,福建厦门361000

出　　处：《南昌大学学报（工科版）》2018年第3期239-245,共7页Journal of Nanchang University(Engineering & Technology)

基　　金：国家自然科学基金资助项目(51578156);福建省科技厅对外合作基金资助项目(2015I0012)

摘　　要：以面积比为参数,对基于使用极限状态的钢管混凝土劲性骨架组合柱的承载力进行研究,分析了面积比对组合柱受力特性的影响。试验表明不同面积比下,组合柱表现出不同的受力状态;有限元分析表明扩大对面积比参数范围的研究,发现在不同钢管、外包混凝土、核心混凝土强度和纵筋配筋量下,面积比对组合柱承载力的影响规律都呈现先增大后减小的趋势;对比分析现有组合柱的承载力计算方法,表明其都不能很好预测大面积比下组合柱的承载力;根据试验和有限元分析的结果,可利用2个临界面积比,分三区段建立组合柱承载力计算公式,结果与有限元值比较,吻合较好,差值在10%之内。Base on the research work of the ultimate bearing capacity of concrete filled steel tube reinforced concrete （CFSTRC） columns with different area ratios.The results showed that the composite columns with different area ratios exhibited different stress states. The finite element results showed that the bearing capacity of CFSTRC columns increased at first and then decreased with area ratio, irrespective of the yield strength of steel tubes and the concrete outside and inside the steel tubes and the longitudinal reinforcement ratio.Most currently available methods were not suitable for calculating the bearing capacity of CFSTRC columns with a large area ratio, and thus should be modified to take into account the confinement effect of the steel tubes on the internal concrete.The formula proposed in this study could accurately calculate the bearing capacity of CFSTRC columns with a difference of less than 10% with the finite element results.

关 键 词：钢管混凝土劲性骨架组合柱 面积比 剥落荷载 承载力公式 

分 类 号：TU398[建筑科学—结构工程] TU375