长期荷载作用下内置钢骨钢管混凝土轴压短柱受力性能研究  

Research on Mechanical Behavior of CFST Axial Compressive Stub Column with Encased Profiled Steel under Long-term Loading

作　　者：史艳莉[1,2] 陈彦玉[1] 王文达[1] 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]兰州大学土木工程与力学学院,甘肃兰州730000

出　　处：《建筑科学》2016年第9期61-68,共8页Building Science

基　　金：国家自然科学基金(51268035);兰州理工大学"红柳杰出人才培养计划"(J201305)

摘　　要：基于合理材料本构模型,本文利用有限元软件ABAQUS首先建立了考虑长期荷载作用时钢管混凝土轴压柱数值分析模型,在模型验证的基础上,进行考虑长期荷载作用时内置十字形钢骨圆钢管混凝土轴压柱受力全过程分析,同时与不考虑长期荷载作用时的结果进行对比,最后对长期荷载比、徐变终值系数、持荷时间、加载龄期4个典型影响因素进行了分析。结果表明:考虑长期荷载作用影响的组合柱极限承载力略大于不考虑长期荷载作用的情况,但其极限承载力所对应的应变却比不考虑长期荷载时大;考虑长期荷载作用时轴压柱的极限承载力随着徐变终值系数、持荷时间的增长而略有提高,而长期荷载比、加载龄期对其几乎没有影响。Based on rational material constitutive model,a numerical model is firstly developed to simulate the behavior of concrete-filled steel tube（ CFST） column under long-term axial compressive loading by using finite element（ FE） software ABAQUS. Then on the basis of verifying the efficiency of modeling method,the whole process of loading behavior of circular CFST axial compressive column with encased profiled steel with long-term load is analyzed,and the result is compared with the one without long-term load. Finally,the parametric studies are conducted in terms of long-term sustained load level,final creep coefficient,reference time,age at initial loading. The results indicate that ultimate strength of composite columns considering the influence of sustained load is slightly large than not considering the influence of sustained load,but the strain corresponding to ultimate strength is larger than the strain without long-term loading. The ultimate strength of axial columns increases slightly with the final creep coefficient and reference time,while varies a little with the long-term sustained load level and age at initial loading.

关 键 词：桥梁工程 长期荷载作用 数值分析 内置钢骨钢管混凝土构件 轴压性能 

分 类 号：TU398[建筑科学—结构工程]