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
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.
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.
Tab.1Test 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.2Mechanical 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.3Mechanical properties of reinforcements
Fig.2Accelerate corrosion simulation test
Fig.3Axial compression test of concrete prisms with stirrups
Fig.4Fail patterns of specimens under uniaxial compression
Fig.5Fail patterns of specimens under uniaxial compression
Fig.6Stress-strain of concrete confined with corroded stirrups under different stirrup corrosion rates
Fig.7Variation of shape factor with concrete strength
Fig.8Variation of shape factor with volumetric hoop rates
Fig.9Variation of shape factor with stirrup corrosion rates
Fig.10Variation of peak stress and strain correction ratio with stirrup corrosion rates
Fig.11Comparison of skeleton curve between calculation and test results
Fig.12Comparison of peak stress and strain between calculation and test results
[1]
邱建国, 萧辅沛, 涂丰钧 考虑盐害腐蚀影响之钢筋混凝土校舍耐震能力评估研究[J]. 结构工程, 2013, 28 (1): 43- 60 QIU Jian-guo, XIAO Fu-pei, TU Feng-jun Seismic performance evaluation of reinforced concrete schools considering the effects of chloride attack[J]. Structural Engineering, 2013, 28 (1): 43- 60
[2]
袁迎曙, 章鑫森, 姬永生 人工气候与恒电流通电法加速锈蚀钢筋混凝土梁的结构性能比较研究[J]. 土木工程学报, 2006, 39 (3): 42- 46 YUAN Ying-shu, ZHANG Xin-sen, JI Yong-sheng A comparative study on structural behavior of deteriorated reinforced concrete beam under two different environments[J]. China Civil Engineering Journal, 2006, 39 (3): 42- 46
doi: 10.3321/j.issn:1000-131X.2006.03.006
[3]
CHRISTOPHER H, WILLIAM C Tests of reinforced concrete beams with corrosion-damaged stirrups[J]. ACI Structural Journal, 2006, 103 (1): 133- 141
[4]
SUFFERN C S, ELSAYED A E, SOUDKI K S Shear strength of disturbed regions with corroded stirrups in reinforc[J]. Canadian Journal of Civil Engineering, 2010, 37 (8): 1045- 1056
doi: 10.1139/L10-031
[5]
LI Q, NIU D T, XIAO Q H, et al Experimental study on seismic behaviors of concrete columns confined by corroded stirrups and lateral strength prediction[J]. Construction and Building Materials, 2018, 162: 704- 713
doi: 10.1016/j.conbuildmat.2017.09.030
[6]
LU Z H, OU Y B, ZHAO Y G, et al Investigation of corrosion of steel stirrups in reinforced concrete structures[J]. Construction and Building Materials, 2016, 127: 293- 305
doi: 10.1016/j.conbuildmat.2016.09.128
[7]
李强, 牛荻涛, 刘磊, 等 箍筋锈蚀混凝土棱柱体试件轴心受压试验研究[J]. 建筑结构, 2013, 43 (1): 65- 68 LI Qiang, NIU Di-tao, LIU Lei, et al Experimental study on reinforced concrete prism specimens confined by corroded stirrups[J]. Building Structure, 2013, 43 (1): 65- 68
[8]
郑山锁, 关永莹, 王萌, 等 人工盐雾环境下锈蚀箍筋约束混凝土本构关系[J]. 建筑材料学报, 2016, 19 (4): 737- 741 ZHENG Shan-suo, GUAN Yong-ying, WANG Meng, et al Constitutive relation of concrete confined with corroded stirrups under artificial salt mist climate environment corrosion[J]. Journal of Building Materials, 2016, 19 (4): 737- 741
doi: 10.3969/j.issn.1007-9629.2016.04.022
[9]
NGOC S V, BO Y, BING L Stress-strain model for confined concrete with corroded transverse reinforcement[J]. Engineering Structures, 2017, 151 (15): 472- 487
[10]
刘磊, 牛荻涛, 李强, 等 锈蚀箍筋约束混凝土应力-应变本构关系模型[J]. 建筑材料学报, 2018, 21 (5): 811- 816 LIU Lei, NIU Di-tao, LI Qiang, et al Stress-strain constitutive relation model of corroded stirrups confined concrete[J]. Journal of Building Materials, 2018, 21 (5): 811- 816
doi: 10.3969/j.issn.1007-9629.2018.05.018
[11]
AHMED K, EI S Shear capacity assessment of reinforced concrete beams with corroded stirrups[J]. Construction and Building Materials, 2017, 134: 176- 184
doi: 10.1016/j.conbuildmat.2016.12.118
[12]
混凝土结构设计规范: GB 50010-2002[S]. 北京: 中国建筑工业出版社, 2002.
[13]
郑山锁, 杨威, 赵彦堂, 等 人工气候环境下锈蚀RC弯剪破坏框架梁抗震性能试验研究[J]. 土木工程学报, 2015, (11): 27- 35 ZHENG Shan-suo, YANG Wei, ZHAO Yan-tang, et al Experimental research on the seismic behaviors of corroded RC frame beams failed in flexure-shear mode under the artificial climate[J]. China Civil Engineering Journal, 2015, (11): 27- 35
[14]
郑山锁, 董立国, 左河山, 等 人工气候环境下锈蚀RC框架柱抗震性能试验研究[J]. 建筑结构学报, 2018, 39 (4): 28- 36 ZHENG Shan-suo, DONG Li-guo, ZUO He-shan, et al Experimental investigation on seismic behaviors of corroded RC frame columns in artificial climate[J]. Journal of Building Structures, 2018, 39 (4): 28- 36
[15]
郑山锁, 张艺欣, 黄鹰歌, 等 酸雨环境下钢筋混凝土框架梁抗震性能试验研究[J]. 建筑结构学报, 2017, 38 (9): 20- 27 ZHENG Shan-suo, ZHANG Yin-xin, HUANG Ying-ge, et al Experimental study on seismic behaviors of reinforced concrete frame beams in simulated acid environment[J]. Journal of Building Structures, 2017, 38 (9): 20- 27
MANDER J B, PRIESTLY M J N, PARK R Theoretical stressstrain model for confined concrete[J]. Journal of Structural Division, 1988, 114 (8): 1804- 1826
doi: 10.1061/(ASCE)0733-9445(1988)114:8(1804)
[18]
过镇海, 张秀琴 混凝土应力-应变全曲线的试验研究[J]. 建筑结构学报, 1982, 3 (1): 1- 12 GUO Zhen-hai, ZHANG Xiu-qin Experimental study on complete stress2strain curves of concrete[J]. Journal of Building Structures, 1982, 3 (1): 1- 12
[19]
PARK R, PRIESTLY M J, GILL W D Ductility of square-confined concrete columns[J]. Journal of Structural Division, 1982, 108 (4): 929- 950
[20]
SAATCIOGLU M, RAZVI R Strength and ductility of confined concrete[J]. Journal of Structure Engineering, 1992, 118 (6): 1590- 1607
doi: 10.1061/(ASCE)0733-9445(1992)118:6(1590)
[21]
周文峰, 黄宗明, 白绍良 约束混凝土几种有代表性应力-应变模型及其比较[J]. 重庆建筑大学学报, 2003, 25 (4): 121- 127 ZHOU Wen-feng, HUANG Zong-ming, BAI Shao-liang Introduction and comparison of several representative confinement models for concrete[J]. Journal of Chongqing Jianzhu University, 2003, 25 (4): 121- 127
