煤矿工业环境中RC小偏压柱力学性能时变规律研究  

Study of the time-varying mechanical performance of reinforced concrete(RC) columns under to small eccentric loading in coal mining industry environment

作　　者：方忠年[1] 吕恒林[1] 吴元周[1] 赵承明[1] 刘矿[1] 马英[1] 刘彬[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院,江苏省土木工程环境灾变与结构可靠性重点实验室,建筑设计咨询研究院有限公司,江苏徐州221008

出　　处：《中国矿业大学学报》2014年第5期800-807,共8页Journal of China University of Mining & Technology

基　　金：江苏省自然科学基金项目(BK2008128);江苏省土木工程环境灾变与结构可靠性重点实验室开放基金项目(JSKL2011ZD02)

摘　　要：采用模拟煤矿地面工业环境加速损伤劣化的试验方法,研究了5个劣化周期10根RC小偏压柱的外观劣化时变特征、承载力和刚度时变规律及其力学性能退化机理.结果表明:钢筋开始锈蚀后的平均锈蚀率与劣化周期呈二次多项式关系,随着劣化程度的加深,钢筋力学性能下降、混凝土截面损伤增大,造成小偏压柱的刚度和极限承载力下降.建立了与纵筋性能退化、混凝土截面损伤、黏结力退化以及箍筋锈蚀对纵筋压曲强度的影响系数有关的劣化RC小偏压柱剩余承载力的估算模型.To evaluate the performance of RC structures in the corrosive environment of coal mining industry on the ground, the environment was simulated in laboratory to accelerate the aging process of RC column specimens. Ten specimens were tested under eccentric load until failure for five deterioration cycles, and the time-varying mechanical performances of these col- umns were studied. The results show that the average corrosion rate of reinforcement varies with the degradation cycle following a quadratic polynomial. The reinforcement mechanical per- formances, as well as the column stiffness and ultimate bearing capacity, are degenerating with respect to the concrete section damage. A proximate model for estimating the residual bearing capacity was established, it considers the degradation of longitudinal reinforcements, the bond, concrete injury and the impact of corrosive stirrups on the longitudinal bars.

关 键 词：煤矿地面工业环境 小偏心受压 力学性能 时变 估算模型 

分 类 号：TU375.3[建筑科学—结构工程]