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浙江大学学报(工学版)
浙江大学学报(工学版)  2020, Vol. 54 Issue (1): 48-55    DOI: 10.3785/j.issn.1008-973X.2020.01.006
土木工程、交通工程     
近海环境下锈蚀箍筋约束混凝土本构模型
郑山锁1,2(),郑跃1,2(),董立国1,2,可亮1,2,张艺欣1,2
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
Constitutive model of confined concrete by corroded stirrups in coastal environment
Shan-suo ZHENG1,2(),Yue ZHENG1,2(),Li-guo DONG1,2,Liang KE1,2,Yi-xin ZHANG1,2
1. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
2. Key Laboratory of Structural Engineering and Earthquake Resistance, Ministry of Education, Xi’an University of Architecture and Technology, Xi’an 710055, China
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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.
关键词： 近海环境;  约束混凝土;  锈蚀箍筋;  轴压试验;  Mander模型    
Abstract:

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.
Key words: coastal environment    confined concrete    corrosion stirrup    axial pressure test    Mander model
收稿日期: 2019-06-12 出版日期: 2020-01-05
CLC:  TU 365  
基金资助: 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）
作者简介: 郑山锁（1960—），男，教授，从事结构工程抗震研究. orcid.org/0000-0003-1171-4511. E-mail： zhengshansuo@263.net
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引用本文:

郑山锁,郑跃,董立国,可亮,张艺欣. 近海环境下锈蚀箍筋约束混凝土本构模型[J]. 浙江大学学报(工学版), 2020, 54(1): 48-55.

Shan-suo ZHENG,Yue ZHENG,Li-guo DONG,Liang KE,Yi-xin ZHANG. Constitutive model of confined concrete by corroded stirrups in coastal environment. Journal of ZheJiang University (Engineering Science), 2020, 54(1): 48-55.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.01.006    或    http://www.zjujournals.com/eng/CN/Y2020/V54/I1/48

图 1  试件的几何尺寸及配筋
试件编号 混凝土强度 箍筋 μt/% w/mm ηs/% 试件编号 混凝土强度 箍筋 μt/% w/mm ηs/%
L1 C30 ?6@60 mm 1.57 0 0 L19 C40 ?6@80 mm 1.18 1.0 7.13
L2 C30 ?6@60 mm 1.57 0.8 4.11 L20 C40 ?6@80 mm 1.18 1.3 11.12
L3 C30 ?6@60 mm 1.57 1.0 7.23 L21 C40 ?8@80 mm 2.13 0 0
L4 C30 ?6@60 mm 1.57 1.3 10.98 L22 C40 ?8@80 mm 2.13 0.8 3.54
L5 C30 ?6@80 mm 1.18 0 0 L23 C40 ?8@80 mm 2.13 1.0 6.43
L6 C30 ?6@80 mm 1.18 0.8 4.33 L24 C40 ?8@80 mm 2.13 1.3 10.33
L7 C30 ?6@80 mm 1.18 1.0 7.55 L25 C50 ?6@60 mm 1.57 0 0
L8 C30 ?6@80 mm 1.18 1.3 11.43 L26 C50 ?6@60 mm 1.57 0.8 3.78
L9 C30 ?8@80 mm 2.13 0 0 L27 C50 ?6@60 mm 1.57 1.0 7.31
L10 C30 ?8@80 mm 2.13 0.8 3.66 L28 C50 ?6@60 mm 1.57 1.3 11.03
L11 C30 ?8@80 mm 2.13 1.0 6.67 L29 C50 ?6@80 mm 1.18 0 0
L12 C30 ?8@80 mm 2.13 1.3 10.56 L30 C50 ?6@80 mm 1.18 0.8 3.64
L13 C40 ?6@60 mm 1.57 0 0 L31 C50 ?6@80 mm 1.18 1.0 6.88
L14 C40 ?6@60 mm 1.57 0.8 3.87 L32 C50 ?6@80 mm 1.18 1.3 11.56
L15 C40 ?6@60 mm 1.57 1.0 7.01 L33 C50 ?8@80 mm 2.13 0 0
L16 C40 ?6@60 mm 1.57 1.3 10.77 L34 C50 ?8@80 mm 2.13 0.8 3.38
L17 C40 ?6@80 mm 1.18 0 0 L35 C50 ?8@80 mm 2.13 1.0 6.21
L18 C40 ?6@80 mm 1.18 0.8 4.01 L36 C50 ?8@80 mm 2.13 1.3 9.98
表 1  锈蚀箍筋混凝土棱柱体试件设计参数
强度等级 fcu/MPa fc/MPa Ec/MPa
C30 36.95 28.18 3.0×104
C40 46.29 35.18 3.0×104
C50 59.51 45.23 3.0×104
表 2  混凝土的力学性能
钢筋直径/mm fy/MPa ft/MPa Es/MPa
6 270 428 2.1×105
8 285 418 2.1×105
12 350 458 2.0×105
表 3  钢筋的力学性能
图 2  加速腐蚀模拟试验
图 3  箍筋约束混凝土棱柱体轴压试验
图 4  试件的典型锈蚀损伤形态
图 5  试件轴压破坏形态
图 6  不同箍筋锈蚀率下锈蚀箍筋约束混凝土的应力-应变曲线
图 7  形状系数随混凝土强度的变化规律
图 8  形状系数随体积配箍率的变化规律
图 9  形状系数随箍筋锈蚀率的变化规律
图 10  应力和应变修正系数随箍筋锈蚀率的变化规律
图 11  计算骨架曲线与试验骨架曲线对比
图 12  峰值应力和应变的计算值与试验值对比
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