界面缺陷钢管混凝土轴压极限承载力理论推导  

Theoretical derivation of ultimate bearing capacity of concrete filled steel tube with interface defects under axial compression

作　　者：卢进 秦鹏[1] LU Jin;QIN Peng(School of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《铁道科学与工程学报》2018年第9期2316-2326,共11页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51308201);国家重点专项资助项目(2016YFC0701400)

摘　　要：基于核心混凝土界面缺陷对钢管混凝土构件力学性能的影响是当前研究的热点问题,钢管混凝土存在缺陷后其极限承载力会下降,且缺陷越大其承载力下降越多,但是,并没有一个定量的表达式能计算具体缺陷后的承载力。用极限平衡法对界面缺陷钢管混凝土极限承载力进行理论推导,建立3种常见界面缺陷钢管混凝土轴压短柱极限承载力近似计算公式。结合已有研究文献进行实例验证。研究结果表明用本文推导的承载力与文献试验值的折减基本趋势一致,验证了本文理论推导的可行性及精确性。The effect of the core concrete interface defect of the mechanical properties of the concrete filled steel tube is a hot topic at present.The ultimate bearing capacity of the concrete filled steel tube would decrease once it has the defects,i.e.,the larger the defect,the more the bearing capacity would be reduced;however,there is no quantitative formula to calculate the bearing capacity with specific defects.Theoretical derivation of the ultimate bearing capacity of concrete filled steel tube with interfacial defects was put forward by means of the limit equilibrium method.The approximate formula for the ultimate bearing capacity of three different types of concrete filled steel tubular short columns with common interface defects was established.The results show that the basic trend of the load reduction deduced from this paper is the same as that of the testing values in the literature,which proves the theoretical derivation presented in this paper is feasible and accurate.

关 键 词：界面缺陷 钢管混凝土 极限平衡方法 承载力近似计算 

分 类 号：TU392[建筑科学—结构工程]