锈蚀钢筋混凝土柱抗震性能试验研究  

Experimental study on seismic behavior of RC columns with corroded reinforcing bars

作　　者：罗小勇[1,2] 程俊峰 龙昊 申智勇 夏玉领 LUO Xiaoyong;CHENG Junfeng;LONG Hao;SHEN Zhiyong;XIA Yuling(School of Civil Engineering,Central South University,Changsha 410075,China;Prefabricated Construction Engineering and Technological Research Center of Hunan Province,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]湖南省装配式建筑工程技术研究中心,湖南长沙410075

出　　处：《建筑结构学报》2021年第4期69-79,共11页Journal of Building Structures

基　　金：国家自然科学基金重点项目联合基金项目(U1361204),“十三五”国家重点研发计划(2016YFC0701700);湖南省研究生科研创新项目(CX20190127,2019zzts071)。

摘　　要：为研究钢筋锈蚀对钢筋混凝土(RC)柱抗震性能的影响,设计并制作了8根RC柱试件,其中包括1根未锈蚀柱、3根纵筋锈蚀柱和4根箍筋锈蚀柱。采用5%NaCl溶液浸泡试件并通电对钢筋进行锈蚀试验,通电锈蚀完成后,分别对8根试件进行了低周往复循环荷载试验,分析得到了不同锈蚀率下各试件的破坏模式、滞回曲线、骨架曲线、刚度退化、延性及耗能能力等结果。结果表明:与未锈蚀柱相比,随着纵筋与箍筋锈蚀率的增加,滞回曲线的饱满程度均逐渐减小,同时试件的耗能能力、刚度及变形也显著降低,且箍筋锈蚀率的影响更显著。当箍筋锈蚀率达到15.19%时,试件的位移延性系数和平均耗能系数分别降低了19.9%和35.6%。同时,在柱的端部塑性铰区形成剪切破坏面,试件发生脆性破坏。箍筋锈蚀率大于15.19%这一不利影响在抗震设防区域应引起重视。In order to investigate the impacts of corroded reinforcing bars on seismic performance of reinforced concrete(RC) columns, eight RC columns were designed and constructed, which composed of one non-corroded RC column, three RC columns with corroded longitudinal reinforcement and four RC columns with corroded stirrup. Meanwhile, all the columns were immersed in 5% NaCl solution(mass fraction) and the electrochemical test was conducted to accelerate the corrosion of steel bars in RC columns. Low-cycle reversed loading tests on these RC columns were carried out. The seismic behavior parameters, including the failure mode, hysteretic curves, skeleton curves, stiffness degradation, ductility and energy dissipation capacity of the corroded RC columns and uncorroded columns were compared and discussed. The experimental results indicate that, with the increase of corrosion rate of rebars, the fullness of hysteretic curves decreases gradually, and the energy dissipation capacity, stiffness and deformation performance of specimens decrease significantly,and they are remarkable affected by the stirrup corrosion ratio. The displacement ductility coefficient and average energy dissipation coefficient decrease by 19.9% and 35.6% respectively when the corrosion rate of stirrups reaches 15.19%. Besides, a shear failure surface is formed in the plastic hinge region at the foot of columns, which leads to the shear brittle failure with poor ductility. The adverse effect of stirrups corrosion over 15.19% in RC columns should be considered in seismic design of structures.

关 键 词：钢筋混凝土柱 锈蚀 通电锈蚀试验 低周往复循环荷载试验 抗震性能 

分 类 号：TU375.303[建筑科学—结构工程]