长期荷载作用对方钢管混凝土柱承载力的影响  

Effects of long-term loads on the strength of concrete-filled steel box columns

作　　者：韩林海[1] 陶忠[1] 刘威[1] 陈宝春[1] 

机构地区：[1]福州大学土木建筑工程学院,福建福州350002

出　　处：《中国公路学报》2001年第3期57-61,66,共6页China Journal of Highway and Transport

基　　金：霍英东教育基金项目 ( 0 5 0 10 64 )

摘　　要：考虑长期荷载作用效应的影响 ,进行了 6个方钢管混凝土轴心受压构件承载力的试验研究 ,提出轴心受压时方钢管混凝土的核心混凝土的应力—应变关系模型 ,在此基础上 ,利用数值方法成功地计算出考虑长期荷载作用影响时方钢管混凝土构件的荷载—变形全过程关系曲线 ,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、截面含钢率、钢材和混凝土强度等因素影响的基础上 ,提出长期荷载作用对方钢管混凝土柱承载力的影响系数。Six concrete filled steel box specimens are tested to investigate the influence of long term load on the behaviors of the members.An attempt to predict the stress strain relations of the core concrete after sustaining axially compressive load by means of a model that is proposed in this paper.The load deformation behavior of the concrete filled steel box columns is analyzed.A comparison of results calculated using this model shows good agreement with test results.Based on the theoretical model,effects of influence of the changing steel ratio,slenderness ratio,strength of the steel and the concrete on the bearing capacity of the members after sustained load is discussed.Finally,influencing ratios of long term load on the bearing capacities of the concrete filled steel box columns are suggested.

关 键 词：方钢筋混凝土柱 长期荷载 徐变 承载力 

分 类 号：TU375.3[建筑科学—结构工程]