锈损钢筋混凝土结构截面刚度衰变分析
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摘要
针对钢筋锈蚀导致的钢筋混凝土截面刚度衰变问题,基于Python语言,开发截面刚度非线性仿真程序,建立无损伤截面与损伤截面二维数值模型;分别考虑混凝土强度、截面尺寸与材料劣化导致的钢筋屈服强度降低、钢筋截面面积减小和混凝土截面损伤等问题,开展无损伤截面与损伤截面的弯矩-曲率关系计算分析,提出了考虑锈蚀率、混凝土强度与配筋率的截面刚度退化实用计算模型。研究结果表明:混凝土强度和截面尺寸影响无损伤截面刚度,截面尺寸相对刚度的影响更明显;钢筋锈蚀对损伤截面刚度的影响极为显著,随着锈蚀率的增加,截面开裂时和钢筋屈服时刚度不断减小,且开裂、破坏阶段提前发生;刚度退化实用计算模型可为钢筋锈蚀损伤混凝土结构性能检测评定提供参考。
Aiming at the problem of stiffness degradation of reinforced concrete cross-sections caused by corrosion of steel bars,a non-linear simulation program for cross-section stiffness based on the Python language was developed,and two-dimensional numerical models of non-damaged cross-sections and damaged cross-sections were established.Considering the concrete strength,the section-size and the reduction of yield strength of reinforcing bar,the reduction of reinforcing bar cross-section area and the damage of concrete cross-section caused by material deterioration,the moment-curvature relationship between non-damaged cross-sections and damaged cross-sections was calculated and analyzed,and a practical calculation model considering the degradation of cross-section stiffness including corrosion rate,concrete strength and reinforcement ratio was proposed.The calculation results show that the concrete strength and the section-size affect the stiffness of non-damaged cross-sections;relatively speaking,the influence of the section-size on the stiffness is more obvious.The influence of the steel corrosion on the stiffness of the damaged cross-sections is extremely significant.With the increase of the corrosion rate,the stiffness decreases when the section cracks and the steel bar yields,and the cracking and failure stages occur in advance.The proposed gradually practical calculation model of stiffness degradation can provide reference for the evaluation of the performance of corroded reinforced concrete structures.
Aiming at the problem of stiffness degradation of reinforced concrete cross-sections caused by corrosion of steel bars,a non-linear simulation program for cross-section stiffness based on the Python language was developed,and two-dimensional numerical models of non-damaged cross-sections and damaged cross-sections were established.Considering the concrete strength,the section-size and the reduction of yield strength of reinforcing bar,the reduction of reinforcing bar cross-section area and the damage of concrete cross-section caused by material deterioration,the moment-curvature relationship between non-damaged cross-sections and damaged cross-sections was calculated and analyzed,and a practical calculation model considering the degradation of cross-section stiffness including corrosion rate,concrete strength and reinforcement ratio was proposed.The calculation results show that the concrete strength and the section-size affect the stiffness of non-damaged cross-sections;relatively speaking,the influence of the section-size on the stiffness is more obvious.The influence of the steel corrosion on the stiffness of the damaged cross-sections is extremely significant.With the increase of the corrosion rate,the stiffness decreases when the section cracks and the steel bar yields,and the cracking and failure stages occur in advance.The proposed gradually practical calculation model of stiffness degradation can provide reference for the evaluation of the performance of corroded reinforced concrete structures.
引文
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[16]彭建新,阳逸鸣,唐皇,等.锈蚀钢筋蚀坑特征分析及其对力学性能的影响[J].长沙理工大学学报(自然科学版),2015,12(3):50-55.PENG Jianxin, YANG Yiming, TANG Huang, et al.Characteristic of pitting corrosion for steel reinforcement and its effect on mechanical properties[J].Journal of Changsha University of Science and Technology(Natural Science),2015,12(3):50-55.
[17]LU C,YUAN S,CHENG P,et al.Mechanical properties of corroded steel bars in pre-cracked concrete suffering from chloride attack[J].Construction and Building Materials,2016,123:649-660.
[18]OU Y,SUSANTO Y T T,ROH H.Tensile behavior of naturally and artificially corroded steel bars[J].Construction and Building Materials,2016,103:93-104.
[19]CAPOZUCCA R.Damage to reinforced concrete due to reinforcement corrosion[J].Construction and Building Materials,1995,9(5):295-303.
[20]惠云玲,李荣,林志伸,等.混凝土基本构件钢筋锈蚀前后性能试验研究[J].工业建筑,1997,27(6):14-18.HUI Yunling,LI Rong,LIN Zhishen,et al.Experimental studies on the property before and after corrosion of rebars in basic concrete members[J].Industrial Construction,1997,27(6):14-18.
[2]XIN Jingzhou,ZHOU Jianting,ZHOU Fengbin,et al.Bearing capacity model of corroded rceccentric compression columns based on Hermite interpolation and Fourier fitting[J].Applied Sciences,2019,9(1),24.
[3]2017年交通运输行业发展统计公报[EB/OL].(2018-03-30)[2018-06-29].http://zizhan.mot.gov.cn/zfxxgk/bnssj/zhghs/201803/t20180329_3005087.html.2017development statistics bulletin of the transport industry[EB/OL].(2018-03-30)[2018-06-29].http://zizhan.mot.gov.cn/zfxxgk/bnssj/zhghs/201803/t20180329_3005087.html.
[4]ZHAO Y,DONG J,WU Y,et al.Corrosion-induced concrete cracking model considering corrosion product-filled paste at the concrete/steel interface[J].Construction&Building Materials.2016,116:273-280.
[5]汪奔,王弘,张志强,等.基于XFEM的混凝土保护层锈胀裂纹分析[J].河海大学学报(自然科学版),2017,45(2):161-166.WANG Ben,WANG Hong,ZHANG Zhiqiang,et al.Analysis of corrosion-expansion-induced cracks on concrete cover based on XFEM[J].Journal of Hohai University(Natural Sciences),2017,45(2):161-166.
[6]阳逸鸣,彭建新,张建仁.考虑多因素作用下的RC梁抗力时空退化模型[J].哈尔滨工业大学学报,2017,49(9):58-64.YANG Yiming, PENG Jianxin, ZHANG Jianren.Resistance degradation model of RC beam under the influence of many factors[J].Journal of Harbin Institute of Technology,2017,49(9):58-64.
[7]顾祥林,许勇,张伟平.钢筋混凝土梁开裂后刚度退化研究[J].结构工程师,2005,21(5):20-23.GU Xianglin, XU Yong, ZHANG Weiping.Study onstiffness deterioration of RC beams after cracking[J].Structural Engineers,2005,21(5):20-23.
[8]MANDER J A B,PRIESTLEY M J N.Theoretical stress-strain model for confined concrete[J].Journal of Structural Engineering,1988,114(8):1804-1826.
[9]赵羽习.钢筋锈蚀引起混凝土结构锈裂综述[J].东南大学学报(自然科学版),2013,43(5):1122-1134.ZHAO Yuxi.State-of-art of corrosion-induced cracking of reinforced concrete structures[J].Journal of Southeast University(Natural Science Edition),2013,43(5):1122-1134.
[10]惠云玲.锈蚀钢筋力学性能变化初探[J].工业建筑,1992(10):33-36.HUI Yunling.Approach to mechanical behavior of rusty reinforcement[J].Industrial Construction,1992(10):33-36.
[11]张伟平,商登峰,顾祥林.锈蚀钢筋应力-应变关系研究[J].同济大学学报(自然科学版),2006,34(5):586-592.ZHANG Weiping,SHANG Dengfeng,GU Xianglin.Stressstrain relationship of corroded steel bars[J].Journal of Tongji University(Natural Science),2006,34(5):586-592.
[12]吴庆,袁迎曙.锈蚀钢筋力学性能退化规律试验研究[J].土木工程学报,2008,41(12):42-47.WU Qing, YUAN Yingshu.Experimental study on the deterioration of mechanical properties of corroded steel bars[J].China Civil Engineering Journal,2008,41(12):42-47.
[13]张克波,张建仁,王磊.锈蚀对钢筋强度影响试验研究[J].公路交通科技,2010,27(12):59-66.ZHANG Kebo,ZHANG Jianren,WANG Lei.Experimental study on effect of corrosion on reinforcement strength[J].Journal of Highway and Transportation Research and Development,2010,27(12):59-66.
[14]金伟良,赵羽习.混凝土结构耐久性[M].北京:科学出版社,2014.JIN Weiliang,ZHAO Yuxi.Durability of Concrete Structures[M].Beijing:Science Press,2014.
[15]孙晓燕,朱建科,王海龙,等.考虑局部锈蚀特征的钢筋性能退化试验研究[J].建筑材料学报,2014,17(5):804-810.SUN Xiaoyan, ZHU Jianke, WANG Hailong, et al.Experimental investigation of performance degradation of corroded rebar considering pitting feature[J].Journal of Building Materials,2014,17(5):804-810.
[16]彭建新,阳逸鸣,唐皇,等.锈蚀钢筋蚀坑特征分析及其对力学性能的影响[J].长沙理工大学学报(自然科学版),2015,12(3):50-55.PENG Jianxin, YANG Yiming, TANG Huang, et al.Characteristic of pitting corrosion for steel reinforcement and its effect on mechanical properties[J].Journal of Changsha University of Science and Technology(Natural Science),2015,12(3):50-55.
[17]LU C,YUAN S,CHENG P,et al.Mechanical properties of corroded steel bars in pre-cracked concrete suffering from chloride attack[J].Construction and Building Materials,2016,123:649-660.
[18]OU Y,SUSANTO Y T T,ROH H.Tensile behavior of naturally and artificially corroded steel bars[J].Construction and Building Materials,2016,103:93-104.
[19]CAPOZUCCA R.Damage to reinforced concrete due to reinforcement corrosion[J].Construction and Building Materials,1995,9(5):295-303.
[20]惠云玲,李荣,林志伸,等.混凝土基本构件钢筋锈蚀前后性能试验研究[J].工业建筑,1997,27(6):14-18.HUI Yunling,LI Rong,LIN Zhishen,et al.Experimental studies on the property before and after corrosion of rebars in basic concrete members[J].Industrial Construction,1997,27(6):14-18.
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