近海环境下锈蚀箍筋约束混凝土本构模型  

Constitutive model of confined concrete by corroded stirrups in coastal environment

作　　者：郑山锁[1,2] 郑跃 董立国 可亮 张艺欣 ZHENG Shan-suo;ZHENG Yue;DONG Li-guo;KE Liang;ZHANG Yi-xin(School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Key Laboratory of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《浙江大学学报（工学版）》2020年第1期48-55,72,共9页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目（51678475）;国家科技支撑计划资助项目（2013BAJ08B03）;陕西省重点研发计划资助项目（2017ZDXM-SF-093）;陕西省教育厅产业化项目（18JC020）;西安市科技计划资助项目（19XC009)

摘　　要：采用人工气候环境模拟技术模拟近海环境,对36组约束混凝土棱柱体试件进行加速腐蚀,开展轴压试验,研究箍筋锈蚀对约束混凝土峰值应力、峰值应变和应力-应变曲线形状的影响.通过对试验结果的回归分析,得到考虑箍筋锈蚀率影响的混凝土峰值应力和应变修正系数拟合公式,以形状系数作为应力-应变曲线形状参数,基于Mander模型确定考虑箍筋锈蚀率影响的形状系数的计算公式,建立近海环境下的锈蚀箍筋约束混凝土本构模型.与试验结果对比发现:采用该模型计算得到的各试件峰值应力、峰值应变及应力-应变曲线形状均与试验结果符合较好,表明建立的本构模型能够较准确地反映锈蚀箍筋约束混凝土力学性能,可以用于该环境下的锈蚀RC结构剩余承载力及抗震性能评估.Thirty-six reinforced concrete prism specimens were subjected to accelerated corrosion tests by artificial climate simulation technique followed by axial pressure tests in order to analyze the influence of stirrup corrosion level on the peak stress, peak strain, and shape of stress-strain curve of the confined concrete. The factor calculation formulas for peak stress and peak strain of corroded reinforce concrete (RC) prism specimens was developed by regression analysis of test data. The shape of the stress-strain curve of the specimens was characterized by shape factor based on Mander's model. Then the confined concrete by corroded stirrups constitutive model in coastal environment was established. The simulation results were compared with the experimental data. Results showed that all the peak stress, peak strain and stress-strain curves shape of the specimens obtained by proposed method agreed well with the experimental data. The established constitutive mode for confined concrete with corroded stirrup can accurately reflect the mechanical performance of corroded RC prism specimen, indicating its adaptiveness for estimating the residual bearing capacity and the seismic performance of corroded RC structure under the coastal environment.

关 键 词：近海环境 约束混凝土 锈蚀箍筋 轴压试验 Mander模型 

分 类 号：TU365[建筑科学—结构工程] TU317