长期荷载作用对圆钢管混凝土压弯构件力学性能影响的研究  

THE EFFECTS OF LONG-TIME LOADING ON THE BEHAVIOR OF CONCRETE-FILLED STEEL TUBULAR MEMBER

作　　者：韩林海[1] 刘威[1] 

机构地区：[1]福州大学,福州 350002

出　　处：《土木工程学报》2002年第2期8-19,共12页China Civil Engineering Journal

摘　　要：基于ACI (1992 )提供的混凝土徐变和收缩模型 ,本文提出一种适合于长期荷载作用下圆钢管混凝土构件变形的计算方法 ,理论结果和试验结果基本吻合。在此基础上 ,分析了加载龄期、持荷时间、轴压比、构件截面含钢率、钢材种类、混凝土强度等级和荷载偏心率等因素对长期荷载作用下圆钢管混凝土构件变形性能的影响规律。考虑长期荷载作用的影响 ,本文利用数值方法成功地计算出圆钢管混凝土构件的承载力 ,理论计算结果和试验结果吻合良好。最后 ,在系统分析长细比、构件截面含钢率、钢材种类、混凝土强度等级、荷载偏心率等因素影响的基础上 ,提出长期荷载作用对圆钢管混凝土构件承载力影响系数的计算方法 ,The effects of long?time loading on the behavior of concrete?filled steel tubular member are studied in the paper. Many factors are considered in the study, these factors include the age of concrete at loading, the duration of loading, the ratio of axial compression stress to strength, the steel ratio, the grades of steel, the strength of concrete, and the eccentricity of load. The bearing capacity of a concrete?filled steel tubular member under long?time loading is obtained by the numerical method. A comparison of results calculated shows good agreement with that of the test results. At last, the influence coefficients of the bearing capacity under long?time loading are proposed, some useful conclusions are achieved.

关 键 词：圆钢管混凝土 徐变系数 承载力 长期荷载 压弯构件力学性能 

分 类 号：TU398.9[建筑科学—结构工程]