一般大气环境侵袭与疲劳荷载共同作用下RC梁抗弯承载力时变模型  

Time-varying model for flexural capacity of RC beams subjected to the coupling effect of atmospheric environment and fatigue load

作　　者：朱红兵[1] 邱志成[1] 袁强松 Zhu Hongbing Qiu Zhicheng Yuan Qiangsong(College of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, Chin)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065

出　　处：《武汉科技大学学报》2017年第1期76-80,共5页Journal of Wuhan University of Science and Technology

基　　金：国家863计划资助项目(2009AA11Z101);交通运输部西部交通建设科技项目(200631800019);湖北省自然科学基金资助项目(2011CDB239)

摘　　要：首先综合钢筋混凝土(RC)结构中混凝土强度时变规律以及钢筋强度和截面积时变规律的现有研究成果,得到RC梁在一般大气环境下的抗弯承载力退化模型。然后根据模型梁疲劳试验数据,拟合出疲劳荷载作用下RC梁的抗弯承载力退化模型。通过引入影响系数αE,将这两个模型进行耦合,建立了一般大气环境侵袭和疲劳荷载共同作用下的RC梁抗弯承载力时变模型,并根据文献资料中的试验数据拟合得到αE的计算公式。利用本文模型可测算RC梁在服役期内的抗弯承载力演变过程。Degradation model for the flexural capacity of reinforced concrete （RC） beams in atmospher- ic environment is given by summarizing the existing research results about time-varying regularities of concrete strength, steel bar＇s strength and sectional area in RC structures. Then degradation model for the＇ flexural capacity of RC beams subjected to fatigue load is obtained by fitting the fatigue test data of model beams. The two models are combined by introducing influence coefficient αE, educing the time-varying model for flexural capacity of RC beams subjected to the coupling effect of atmospheric environment and fatigue load. The formula of αE is derived by fitting the test data from references. The proposed models can be used to estimate the degradation process of RC beam＇s flexural capacity during its service period.

关 键 词：钢筋混凝土梁 抗弯承载力 时变模型 大气环境 疲劳荷载 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]