保护层厚度对材料劣化的RC桥墩抗震性能影响
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- 英文论文题名：Influence of cover thickness on seismic performance of RC bridge piers with material deterioration
- 论文作者：赵建锋 ; 李洪一 ; 孙伟帅
- 英文论文作者：Zhao Jianfeng ; Li Hongyi ; Sun Weishuai ; Qingdao University of Technology
- 年：2016
- 作者机构：青岛理工大学;
- 论文关键词：氯离子侵蚀 ; 保护层厚度 ; RC桥墩 ; 抗震性能
- 英文论文关键词：chloride ion corrosion ; concrete cover of steel bars ; reinforced concrete pier ; seismic performance
- 会议召开时间：2016-10-27
- 会议录名称：第九届全国防震减灾工程学术研讨会论文集
- 语种：中文
- 分类号：U442.55;U443.22
- 学会代码：OGTY
- 会议名称：第九届全国防震减灾工程学术研讨会
- 会议地点：中国安徽合肥
- 主办单位：中国土木工程学会、中国工程院土木、水利与建筑工程学部、中国土木工程学会防震减灾工程技术推广委员会、合肥工业大学、安徽省住房和城乡建设厅
- 学会名称：中国土木工程学会
- 页数：9
- 文件大小：396k
- 原文格式：O
- 会议级别：全国
摘要
为研究材料性能退化时钢筋保护层厚度对RC桥墩抗震性能的影响,以圆柱桥墩为例,通过概率方法确定氯离子侵蚀条件下钢筋的初始锈蚀时间、锈蚀速率,进而建立钢筋直径及其屈服强度的退化模型;运用ABAQUS软件建立非线性动力分析模型,分别分析了纵筋保护层取40mm、55mm、70mm三种工况时RC桥墩的抗震性能并进行了比较。结果表明:在役初期,钢筋保护层厚度越小,桥墩抗震能力越强;随着在役时间推移,有较大钢筋保护层厚度的桥墩抗震优势越来越明显。
In order to study the influence of the thickness of concrete cover of steel bars on the seismic performance of RC Bridge Piers with the material deterioration,a cylindrical pier was taken as an example.By means of probability method,the initial corrosion time and corrosion rate under the condition of chloride ion erosion were determined,and the deterioration models of the diameter and yield strength of steel were established.The nonlinear dynamic analysis model was made by ABAQUS software and three conditions were used to research the seismic performance of bridge piers.The results show that the thinner the thickness of reinforced protective layer is,the stronger the seismic capacity of bridge pier will be at the beginning;As time goes by,seismic superiority of the bridge pier which has thicker reinforced protective layer is more and more obvious.
In order to study the influence of the thickness of concrete cover of steel bars on the seismic performance of RC Bridge Piers with the material deterioration,a cylindrical pier was taken as an example.By means of probability method,the initial corrosion time and corrosion rate under the condition of chloride ion erosion were determined,and the deterioration models of the diameter and yield strength of steel were established.The nonlinear dynamic analysis model was made by ABAQUS software and three conditions were used to research the seismic performance of bridge piers.The results show that the thinner the thickness of reinforced protective layer is,the stronger the seismic capacity of bridge pier will be at the beginning;As time goes by,seismic superiority of the bridge pier which has thicker reinforced protective layer is more and more obvious.
引文
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[2]ASCE.Report Card for America's Infrastructure[R].Reston:ASCE.2009.
[3]Simon J,Bracci J M,Gardoni P.Seismic Response and Fragility of Deteriorated Reinforced Concrete Bridges[J].Journal of Structural Engineering,2010,136(10):1273-1281.
[4]Vu K,Stewart M G.Structural Reliability of Concrete Bridges Including Improved Chloride-induced Corrosion Mode[J].Structural Safety,2000,22(4):313-333.
[5]马亚丽,张爱林.基于规定可靠指标的混凝土结构氯离子侵蚀耐久寿命预测[J].土木工程学报,2006,39(2):36-41.Ma Yali,Zhang Ailin.Durablity Life Prediction of Concrete Structure Based on the Regulated Reliability Index under Chloride Environment[J].China Civil Engineering Journal,2006,39(2):36-41.
[6]杜修力,金浏.钢筋锈胀引发混凝土保护层开裂破坏的细观数值研究[J].计算力学学报,2015,32(6):772-780.Du Xiuli,Jin Liu.Meso-scale Numerical Study on Cracking of Concrete Cover Due to Steel Reinforcement Corrosion[J].Chinese Journal of Computational Mechanics,2015,32(6):772-780.
[7]Hoffman PCWeyers RE.Predicting Critical Chloride Levels in Concrete Bridge Desks.In:Schueller Gl.Shinozuka M,Yao JTP,Balkema AA,editors.Structural safety and reliability:Proceedings of ICOSSAR'93.Rotterdam,1994.p.957-959.
[8]Enright MP.Time——variant Reliability of Reinforced Concrete Bridges under Environmental Attack[D].University of Colorado,1998.
[9]Jayadipta G,Jamie E P.Aging Considerations in the Development of Time-Dependent Seismic Fragility Curves[J].Journal of Structural Engineering,2010,136(12):1497-1511.
[10]Stewart M G,Rosowsky D V.Time-dependent Reliability of Deteriorating Reinforced Concrete Bridge Decks[J].Structural Ssfety,1998,20(1):91-109.
[11]张平生,卢梅,李晓燕.锈损钢筋的力学性能[J].工业建筑,1995,25(9):41-44.Zhang Pingsheng,Lu Mei,Li Xiaoyan.Mechanical Property of Rustiness Reinforcement Steel[J].Industrial Construction,1995,25(9):41-44.
[12]李超,李宏男.考虑氯离子腐蚀作用的近海桥梁结构全寿命抗震性能评价[J].振动与冲击,2014,33(11):70-77.Li Chao,Li Hongnan.Life-cycle Aseismic Performance Evaluation of Offshore Bridge Structures Considering Chloride Ions Corrosion Effect[J].Journal of Vibration and Shock,2014,33(11):70-77.