钢筋混凝土偏压构件抗力的时变规律  

Time Dependent Regularity of Resistance for Reinforced Concrete Members Subjected to Eccentric Compression

作　　者：蒋友宝[1,2] 刘扬[2] 张建仁[2] 吕毅刚[2] 

机构地区：[1]长沙理工大学公路工程省部共建教育部重点实验室,湖南长沙410004 [2]长沙理工大学土木与建筑学院,湖南长沙410004

出　　处：《公路交通科技》2011年第9期96-100,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50878031;50608009);长沙理工大学公路工程省部共建教育部重点实验室开放基金项目(kfj100106);长沙理工大学桥隧重点学科创新基金项目(qs03-2010)

摘　　要：现有钢筋混凝土构件的抗力时变模型,多是关于仅受弯的梁式构件,对偏压构件的考虑较少。针对此不足,首先分析了影响偏压构件抗力的各因素的时变模型。在此基础上,计算了不同参数情形下偏压构件抗力退化的若干数值特征,得出钢筋锈蚀后偏心距较大时抗力均值的下降程度会大一些,同时整个服役期内偏压构件的破坏模式可能会发生改变的结论。最后采用数值拟合方法研究了钢筋锈蚀下偏压构件的抗力退化模型。结果表明,采用三次多项式函数模型来描述抗力均值和标准差的时变规律具有较高的精度。The current time dependent models of resistance for RC member are mainly on bending beam members,lacking enough consideration on reinforced concrete members subjected to eccentric compression.In order to overcome this disadvantage,first,the time dependent models of the factors influencing resistance for RC members subjected to eccentric compression were analyzed.Then,some numerical characteristics of resistance degradation for the members with different parameters were analyzed.It shows that with large eccentricity after reinforcement corrosion,the mean of resistance reduces greatly,and the failure mode of eccentric compressed RC members may be changed during the whole service lifetime.Finally,the degradation model of resistance for corroded reinforced concrete members subjected to eccentric compression was studied by numerical fitting method.The result shows that it is accurate to describe the time dependent regularities of mean and standard deviation of resistance by the cubic polynomial function model.

关 键 词：桥梁工程 钢筋混凝土偏压构件 抗力 数值分析 时变模型 

分 类 号：U446[建筑科学—桥梁与隧道工程]