长期荷载作用对FRP约束混凝土轴心受压构件力学性能的影响  

Long-term effect in FRP-confined concrete stub columns under sustained loading

作　　者：于清[1] 韩林海[1] 张铮[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》2003年第3期58-63,共6页China Journal of Highway and Transport

基　　金：福建省教育厅科技基金项目(JB01012)

摘　　要：进行了12个FRP约束混凝土轴心受压短试件在长期荷载作用下的变形性能以及长期荷载作用后构件承载力的试验研究。基于ACI(1992)方法,提出一种适合于长期荷载作用下FRP约束混凝土轴心受压短构件变形的计算方法,理论结果和试验结果基本吻合。最后,分析了加载龄期和持荷时间、轴压比、含FRP率、FRP和混凝土强度等因素对长期荷载作用下FRP约束混凝土轴压构件变形性能的影响规律。Eight tests on the behavior of FRPconfined concrete stub columns under longterm sustained loading, in addition to providing further tests on the static ultimate strength of the composite columns are performed in this paper. An attempt to predict the timedependent behavior of FRPconfined concrete stub columns by means of a model that is proposed by the ACI(1992) specifications. A comparison of results calculated using this model generally show good agreement with test results. Based on the theoretical model,influence of the changing time immediately after loading, time under sustained loading, strength of the materials,load ratio and FRP ratio on the longterm effects is discussed.

关 键 词：桥梁工程 FRP约束混凝土 实验研究 徐变 收缩 徐变系数 承载力 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]