锈蚀钢筋混凝土梁受剪性能评估
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摘要
正确评价锈蚀钢筋混凝土梁受剪性能是科学评估锈蚀钢筋混凝土结构可靠性和耐久性的关键之一。从锈蚀钢筋混凝土梁斜截面受剪性能退化机理的角度,分析了影响锈蚀钢筋混凝土梁受剪能力的主要因素以及关于抗剪承载力研究方面目前存在的问题,并用已有的实验数据对现有的抗剪承载力计算模型进行了评估。研究表明:现有的钢筋锈蚀程度描述方法不能客观地反映自然锈蚀中的坑蚀,更无法考虑坑蚀引起的应力集中问题;基于名义应力或名义强度的锈蚀钢筋力学性能指标无法科学地地描述锈蚀钢筋的力学特征,锈蚀钢筋和混凝土之间粘结性能应考虑自然锈蚀中坑蚀以及严重锈蚀时锈胀现象的影响,已有的各种锈蚀钢筋混凝土抗剪承载力计算模型均存在一定的片面性。
Evaluation on shear capacity of Corroded Reinforced Concrete Beam(CRCB) is the important part of reliability and durability assessment of existing buildings.The main factors related to shear capacity of the corroded reinforced concrete beams were investigated based on the deterioration mechanism of shear capacity.The barriers to evaluating the shear capacity of CRCB validly were discussed.Validation was conducted according to the existing testing data to assess the current shear capacity models.The results showed that the corrosion degree of reinforcements cannot objectively reflect the nature of corrosion pit based on the current mean expression of the corrosion ratio of reinforcements in which localized corrosion is not highlighted and stress concentration is not involved.The nominal stress or nominal strength cannot reveal the natural mechanical properties of corroded reinforcement.Localized corrosion and corrosion expansion need to be taken into account to investigate the bonding properties between corroded reinforcement and concrete.Although the existing shear capacity models of CRCB are applicable to some extent,however,all of them have been proposed based on inadequate testing data or theoretical analysis.
Evaluation on shear capacity of Corroded Reinforced Concrete Beam(CRCB) is the important part of reliability and durability assessment of existing buildings.The main factors related to shear capacity of the corroded reinforced concrete beams were investigated based on the deterioration mechanism of shear capacity.The barriers to evaluating the shear capacity of CRCB validly were discussed.Validation was conducted according to the existing testing data to assess the current shear capacity models.The results showed that the corrosion degree of reinforcements cannot objectively reflect the nature of corrosion pit based on the current mean expression of the corrosion ratio of reinforcements in which localized corrosion is not highlighted and stress concentration is not involved.The nominal stress or nominal strength cannot reveal the natural mechanical properties of corroded reinforcement.Localized corrosion and corrosion expansion need to be taken into account to investigate the bonding properties between corroded reinforcement and concrete.Although the existing shear capacity models of CRCB are applicable to some extent,however,all of them have been proposed based on inadequate testing data or theoretical analysis.
引文
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[6]Yuan Yingshu,Jia Fuping,Cai Yue.The structural behaviordeterioration model for corroded reinforced concrete beams[J].China Civil Engineering Journal,2001,34(3):47-52.[袁迎曙,贾福萍,蔡跃.锈蚀钢筋混凝土梁的结构性能退化模型[J].土木工程学报,2001,34(3):47-52.]
[7]余索.锈蚀钢筋混凝土构件的性能研究[D].徐州:中国矿业大学,1995.
[8]Xu Shanhua,Niu Ditao.The shear behavior of corroded sim-ply supported reinforced concrete beam[J].Journal ofBuilding Structures,2004,25(5):98-104.[徐善华,牛荻涛.锈蚀钢筋混凝土简支梁斜截面抗剪性能研究[J].建筑结构学报,2004,25(5):98-104.]
[9]Wang Xiaohui,Liu Xila.Shear carrying capacity of corrodedreinforced concrete beams[J].Journal of Shanghai JiaotongUniversity,2007,41(6):944-949.[王小惠,刘西拉.锈蚀钢筋混凝土梁的斜截面抗剪承载能力[J].上海交通大学学报,2007,41(6):944-949.]
[10]Li Xuetian,Yin Huiguang.Degradation mechanism and pre-dicting models of shearing capacity for corroded reinforcedconcrete beams[J].Journal of Xuzhou Institute of Technolo-gy:Natural Sciences Edition,2010,25(4):58-63.[李学田,殷惠光.锈蚀钢筋混凝土梁抗剪能力退化机理和预计模型[J].徐州工程学院学报:自然科学版,2010,25(4):58-63.]
[11]邸小坛,周燕.旧建筑物的检测加固与维护[M].北京:地震出版社,1992.
[12]王深,张伟平,张誉.从混凝土纵向裂宽预测钢筋截面损失的研究[C]//工程安全及耐久性———中国土木工程学会第九届年会.中国:中国土木工程学会,2000:353-356.
[13]Zhang Weiping,Wang Xiaogang,Gu Xianglin,et al.Com-parative study on structural performance of reinforced con-crete beams subjected to natural corrosion and acceleratedcorrosion[J].Journal of Southeast University:Natural Sci-ence Edition,2006,36(S2):139-144.[张伟平,王晓刚,顾祥林,等.加速锈蚀与自然锈蚀钢筋混凝土梁受力性能比较分析[J].东南大学学报:自然科学版,2006,36(增刊Ⅱ):139-144.]
[14]Fan Yingfang,Zhou Jing.Mechanical property of rusty re-bar considering the effects of corrosion pits[J].Journal ofBuilding Materials,2003,6(3):248-252.[范颖芳,周晶.考虑蚀坑影响的锈蚀钢筋力学性能研究[J].建筑材料学报,2003,6(3):248-252.]
[15]Li Jinghui,Yuan Chengfang.Corrosive steel bar concretecomponent oblique cross-section shear capacity remaininglife forecast[J].Gansu Metallurgy,2010,32(4):38-40.[李景辉,元成方.锈蚀钢筋混凝土构件斜截面抗剪承载力的剩余寿命预测[J].甘肃冶金,2010,32(4):38-40.]
[16]Huo Yanhua,Xiong Jingang.Calculation on shear capacityof simply supported concrete beam with corroded reinforce-ment[J].Journal of Nanchang University:Engineering andTechnology,2008,30(3):271-274.[霍艳华,熊进刚.锈蚀钢筋混凝土简支梁受剪承载力计算[J].南昌大学学报:工科版,2008,30(3):271-274.]
[2]Yuan Yingshu,Yu Suo,Jia Fuping.Deterioration of bond be-havior of corroded reinforced concrete[J].Industrial Con-struction,1999,29(11):47-50.[袁迎曙,余索,贾福萍.锈蚀钢筋混凝土的粘结性能退化的试验研究[J].工业建筑,1999,29(11):47-50.]
[3]Zhang Weiping,Shang Dengfeng,Gu Xianglin.State-of-the-art of the mechanical properties of corroded steel bars[J].Industrial Construction,2005,35(S1):706-709.[张伟平,商登峰,顾祥林.锈蚀钢筋力学性能研究现状分析[J].工业建筑,2005,35(增刊Ⅰ):706-709.]
[4]Hui Yunling,Lin Zhishen,Li Rong.Experimental study andanalysis on the property of corroded rebar[J].IndustrialConstruction,1997,27(6):10-13.[惠云玲,林志伸,李荣.锈蚀钢筋性能试验研究分析[J].工业建筑,1997,27(6):10-13.]
[5]Li Tian,Liu Xila.Durability design of concrete structures[J].China Civil Engineering Journal,1994,27(2):47-55.[李田,刘西拉.砼结构的耐久性设计[J].土木工程学报,1994,27(2):47-55.]
[6]Yuan Yingshu,Jia Fuping,Cai Yue.The structural behaviordeterioration model for corroded reinforced concrete beams[J].China Civil Engineering Journal,2001,34(3):47-52.[袁迎曙,贾福萍,蔡跃.锈蚀钢筋混凝土梁的结构性能退化模型[J].土木工程学报,2001,34(3):47-52.]
[7]余索.锈蚀钢筋混凝土构件的性能研究[D].徐州:中国矿业大学,1995.
[8]Xu Shanhua,Niu Ditao.The shear behavior of corroded sim-ply supported reinforced concrete beam[J].Journal ofBuilding Structures,2004,25(5):98-104.[徐善华,牛荻涛.锈蚀钢筋混凝土简支梁斜截面抗剪性能研究[J].建筑结构学报,2004,25(5):98-104.]
[9]Wang Xiaohui,Liu Xila.Shear carrying capacity of corrodedreinforced concrete beams[J].Journal of Shanghai JiaotongUniversity,2007,41(6):944-949.[王小惠,刘西拉.锈蚀钢筋混凝土梁的斜截面抗剪承载能力[J].上海交通大学学报,2007,41(6):944-949.]
[10]Li Xuetian,Yin Huiguang.Degradation mechanism and pre-dicting models of shearing capacity for corroded reinforcedconcrete beams[J].Journal of Xuzhou Institute of Technolo-gy:Natural Sciences Edition,2010,25(4):58-63.[李学田,殷惠光.锈蚀钢筋混凝土梁抗剪能力退化机理和预计模型[J].徐州工程学院学报:自然科学版,2010,25(4):58-63.]
[11]邸小坛,周燕.旧建筑物的检测加固与维护[M].北京:地震出版社,1992.
[12]王深,张伟平,张誉.从混凝土纵向裂宽预测钢筋截面损失的研究[C]//工程安全及耐久性———中国土木工程学会第九届年会.中国:中国土木工程学会,2000:353-356.
[13]Zhang Weiping,Wang Xiaogang,Gu Xianglin,et al.Com-parative study on structural performance of reinforced con-crete beams subjected to natural corrosion and acceleratedcorrosion[J].Journal of Southeast University:Natural Sci-ence Edition,2006,36(S2):139-144.[张伟平,王晓刚,顾祥林,等.加速锈蚀与自然锈蚀钢筋混凝土梁受力性能比较分析[J].东南大学学报:自然科学版,2006,36(增刊Ⅱ):139-144.]
[14]Fan Yingfang,Zhou Jing.Mechanical property of rusty re-bar considering the effects of corrosion pits[J].Journal ofBuilding Materials,2003,6(3):248-252.[范颖芳,周晶.考虑蚀坑影响的锈蚀钢筋力学性能研究[J].建筑材料学报,2003,6(3):248-252.]
[15]Li Jinghui,Yuan Chengfang.Corrosive steel bar concretecomponent oblique cross-section shear capacity remaininglife forecast[J].Gansu Metallurgy,2010,32(4):38-40.[李景辉,元成方.锈蚀钢筋混凝土构件斜截面抗剪承载力的剩余寿命预测[J].甘肃冶金,2010,32(4):38-40.]
[16]Huo Yanhua,Xiong Jingang.Calculation on shear capacityof simply supported concrete beam with corroded reinforce-ment[J].Journal of Nanchang University:Engineering andTechnology,2008,30(3):271-274.[霍艳华,熊进刚.锈蚀钢筋混凝土简支梁受剪承载力计算[J].南昌大学学报:工科版,2008,30(3):271-274.]
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