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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2020, Vol. 54 Issue (1): 48-55    DOI: 10.3785/j.issn.1008-973X.2020.01.006
Civil Engineering, Transportation Engineering     
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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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     
Received: 12 June 2019      Published: 05 January 2020
CLC:  TU 365  
  TU 317  
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Shan-suo ZHENG
Yue ZHENG
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Yi-xin ZHANG
Cite this article:

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.

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


近海环境下锈蚀箍筋约束混凝土本构模型

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 
Fig.1 Dimensions and reinforcements of specimens
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
Tab.1 Test parameters of corroded hoop concrete prism
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
Tab.2 Mechanical properties of concrete
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
Tab.3 Mechanical properties of reinforcements
Fig.2 Accelerate corrosion simulation test
Fig.3 Axial compression test of concrete prisms with stirrups
Fig.4 Fail patterns of specimens under uniaxial compression
Fig.5 Fail patterns of specimens under uniaxial compression
Fig.6 Stress-strain of concrete confined with corroded stirrups under different stirrup corrosion rates
Fig.7 Variation of shape factor with concrete strength
Fig.8 Variation of shape factor with volumetric hoop rates
Fig.9 Variation of shape factor with stirrup corrosion rates
Fig.10 Variation of peak stress and strain correction ratio with stirrup corrosion rates
Fig.11 Comparison of skeleton curve between calculation and test results
Fig.12 Comparison of peak stress and strain between calculation and test results
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