锈蚀钢筋混凝土桥墩抗震能力评估  

Seismic Capacity Evaluation of Corroded Reinforced Concrete Piers

作　　者：白维刚 王军文 马玉龙[1] 张伟 李勇 Bai Weigang;Wang Junwen;Ma Yulong;Zhang Wei;Li Yong(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《湖南科技大学学报（自然科学版）》2019年第4期58-66,共9页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(51508347; 51508350);河北省自然科学基金资助项目(E2011210028; E2015210038;E2019210215);河北省高等学校科学技术研究项目资助(ZD2019124);国家土建结构预制装配化工程技术研究中心开放课题项目资助(2018CPCCE-K03)

摘　　要：为了探究钢筋锈蚀对混凝土桥墩抗震能力的影响,在考虑锈蚀对桥墩纵筋、核心混凝土以及保护层混凝土影响的基础上,提出了锈蚀钢筋混凝土桥墩抗震能力的数值模拟方法,并通过已有试验验证了该模拟方法的可靠性.基于Open Sees平台建立了锈蚀钢筋混凝土桥墩有限元模型,针对仅纵筋锈蚀、仅箍筋锈蚀以及纵筋、箍筋均锈蚀这3种工况,采用Pushover方法计算了钢筋混凝土桥墩的抗震能力,研究了钢筋锈蚀对混凝土桥墩抗震能力的影响,并对纵筋、箍筋均锈蚀工况下的混凝土桥墩抗震能力进行了评估.结果表明:纵筋锈蚀主要影响钢筋混凝土桥墩的极限承载力,箍筋锈蚀则主要影响钢筋混凝土桥墩的延性能力,纵筋、箍筋均锈蚀对钢筋混凝土桥墩的抗震能力影响最大;钢筋锈蚀率越高、地震烈度越大,则混凝土桥墩损伤越严重.In order to investigate the effect of steel corrosion on the seismic capacity of concrete bridge piers,a numerical simulation method for the seismic capacity of corroded reinforced concrete( RC) piers was presented on the basis of the effect of corrosion on the longitudinal reinforcement,core concrete and cover concrete. The reliability of the method was verified by the existing corroded RC piers’ experiment. The OpenSees finite element software was used to establish the calculation model of corroded RC piers and the Pushover method was used to calculate the seismic capacity of corroded RC piers,and that method was used to calculate the seismic capacity of corroded RC piers in three cases of only longitudinal reinforcement corrosion,only rusting of stirrups,both longitudinal reinforcement and stirrups corrosion. The influence of steel corrosion on the seismic capacity of concrete piers was studied,and the seismic capacity of RC piers with corroded longitudinal reinforcement and stirrups was evaluated. The results show that the corrosion of the longitudinal reinforcement mainly affect the ultimate bearing capacity of RC piers and the corrosion of the stirrups mainly impact the ductility of RC piers.The corrosion of the longitudinal reinforcement and stirrups have the greatest influence on the seismic capacity of RC piers;the higher the corrosion rate of steel and the greater the earthquake intensity,the more serious damage of RC piers.

关 键 词：锈蚀钢筋 混凝土桥墩 抗震能力 抗震评估 数值模拟 

分 类 号：U443[建筑科学—桥梁与隧道工程]