施工缝对框架结构抗震性能影响的数值分析
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摘要
为研究施工缝对框架结构抗震性能的影响,利用提出的施工缝模型,基于OPENSEES平台建模进行静力非线性分析和非线性动力时程分析。通过对比整浇框架与带缝框架的顶点最大位移、层间位移角、塑性铰出现和分布规律等明确施工缝对框架结构的抗震性能的影响程度。结果表明,施工缝使框架结构的变形和层间位移角显著增大,并且使8、9度区框架结构的层间位移角分布发生改变;施工缝使柱端更易出现塑性铰,更易发生"强梁弱柱"的破坏模式;在高烈度区,施工缝的影响比较显著,如果忽略其影响,将会高估框架结构的抗震性能。
Using the proposed construction joint numerical model,static nonlinear analysis and dynamic nonlinear analysis were performed to study the influence of construction joint on the seismic behavior of reinforced concrete(RC) frame structures.Ultimate deformations,story drift angles and plastic hinges were investigated from contrasting frames with and without construction joint.The results show that the construction joint increases the deformations and story drift angles remarkably,and changes the distribution of story drift angles.Construction joint makes the plastic hinges incline to appear in the end of columns and the failure pattern of "strong beam and weak column" will emerge.In the areas with high earthquake intensity,the seismic resistance of the frame structures is overestimated if the effect of construction joint is not considered.
Using the proposed construction joint numerical model,static nonlinear analysis and dynamic nonlinear analysis were performed to study the influence of construction joint on the seismic behavior of reinforced concrete(RC) frame structures.Ultimate deformations,story drift angles and plastic hinges were investigated from contrasting frames with and without construction joint.The results show that the construction joint increases the deformations and story drift angles remarkably,and changes the distribution of story drift angles.Construction joint makes the plastic hinges incline to appear in the end of columns and the failure pattern of "strong beam and weak column" will emerge.In the areas with high earthquake intensity,the seismic resistance of the frame structures is overestimated if the effect of construction joint is not considered.
引文
[1]李英民,刘立平.汶川地震建筑震害与思考[M].重庆:重庆大学出版社,2008.LI Yingmin,LIU Liping.Disaster investigation and study report of Sichuan Wenchuan earthquake[M].Chongqing:Chongqing University Press,2008.(in Chinese)
[2]Waters T.A study of the tensile strength of concrete across construction joints[J].Magazine of Concrete Research,1954,6(18):151-153.
[3]宋玉普,魏春明.混凝土施工缝接缝面劈拉强度试验研究[J].混凝土,2006(6):22-25.SONG Yupu,WEI Chunming.Experimental research on the splitting tensile strength for joint surface of concrete construction joint[J].Concrete,2006(6):22-25.(in Chinese)
[4]Monks W L.Treatment of construction joints[J].Concrete,1974,8(2):28-30.
[5]Isao Ujike,Noriyoshi Yoshida,Shigekazu Morishita.Evaluation of mechanical properties of construction joint between new and old concrete undercombined tensile and shear stresses[J].Journal of the Society of Materials Science,Japan,1998,47(1):73-88.
[6]Mattock,Alan H.Cyclic shear transfer and type of interface[J].Journal of the Structural Division,ASCE,1981,107(10):1945-1964.
[7]GB50011-2010建筑抗震设计规范[S].GB 50011-2010 Code for Seismic Design of Buildings[S].(in Chinese)
[8]李英民,于婧,夏洪流.施工缝模型及在钢筋混凝土柱非线性分析中的应用[J].土木建筑与环境工程,2011,33(5):22-28.LI Yingmin,YU Jing,XIA Hongliu.Construction joint modeling and application in nonlinear analysis of RC columns[J].Journal of Civil,Architec-tural and Environmental Engineering,2011,33(5):22-28.(in Chinese)
[9]韩军,李英民,姬淑艳.RC框架结构合理破坏机制的实现[J].哈尔滨工业大学学报,2010,42(12):2003-2008.HAN Jun,LI Yingmin,JI Shuyan.Realization of rational failure mechanism for the RC frame structure[J].Journal of Harbin Institute of Technolo-gy,2010,42(12):2003-2008.(in Chinese)
[10]魏巍,冯启民.几种push-over分析方法对比研究[J].地震工程与工程振动,2002,22(4):66-73.WEI Wei,FENG Qimin.Research on comparison of several push-over analysis methods[J].Journal of Earthquake Engineering and Engineering Vi-bration,2002,22(4):66-73.(in Chinese)
[11]Chopra A K,Goel R K.Capacity-demand-diagram methods for estimating seismic deformation for inelastic structures:SDF systems[R].Berke-ley:PEER,University of California,1999.
[12]杨溥,李英民,赖明.结构时程分析法输入地震波的选择控制目标[J].土木工程学报,2000,33(6):33-37.YANG Pu,LI Yingmin,LAI Ming.A new method for selecting inputting waves for time-history analysis[J].Civil Engineering Journal,2000,33(6):33-37.(in Chinese)
[2]Waters T.A study of the tensile strength of concrete across construction joints[J].Magazine of Concrete Research,1954,6(18):151-153.
[3]宋玉普,魏春明.混凝土施工缝接缝面劈拉强度试验研究[J].混凝土,2006(6):22-25.SONG Yupu,WEI Chunming.Experimental research on the splitting tensile strength for joint surface of concrete construction joint[J].Concrete,2006(6):22-25.(in Chinese)
[4]Monks W L.Treatment of construction joints[J].Concrete,1974,8(2):28-30.
[5]Isao Ujike,Noriyoshi Yoshida,Shigekazu Morishita.Evaluation of mechanical properties of construction joint between new and old concrete undercombined tensile and shear stresses[J].Journal of the Society of Materials Science,Japan,1998,47(1):73-88.
[6]Mattock,Alan H.Cyclic shear transfer and type of interface[J].Journal of the Structural Division,ASCE,1981,107(10):1945-1964.
[7]GB50011-2010建筑抗震设计规范[S].GB 50011-2010 Code for Seismic Design of Buildings[S].(in Chinese)
[8]李英民,于婧,夏洪流.施工缝模型及在钢筋混凝土柱非线性分析中的应用[J].土木建筑与环境工程,2011,33(5):22-28.LI Yingmin,YU Jing,XIA Hongliu.Construction joint modeling and application in nonlinear analysis of RC columns[J].Journal of Civil,Architec-tural and Environmental Engineering,2011,33(5):22-28.(in Chinese)
[9]韩军,李英民,姬淑艳.RC框架结构合理破坏机制的实现[J].哈尔滨工业大学学报,2010,42(12):2003-2008.HAN Jun,LI Yingmin,JI Shuyan.Realization of rational failure mechanism for the RC frame structure[J].Journal of Harbin Institute of Technolo-gy,2010,42(12):2003-2008.(in Chinese)
[10]魏巍,冯启民.几种push-over分析方法对比研究[J].地震工程与工程振动,2002,22(4):66-73.WEI Wei,FENG Qimin.Research on comparison of several push-over analysis methods[J].Journal of Earthquake Engineering and Engineering Vi-bration,2002,22(4):66-73.(in Chinese)
[11]Chopra A K,Goel R K.Capacity-demand-diagram methods for estimating seismic deformation for inelastic structures:SDF systems[R].Berke-ley:PEER,University of California,1999.
[12]杨溥,李英民,赖明.结构时程分析法输入地震波的选择控制目标[J].土木工程学报,2000,33(6):33-37.YANG Pu,LI Yingmin,LAI Ming.A new method for selecting inputting waves for time-history analysis[J].Civil Engineering Journal,2000,33(6):33-37.(in Chinese)
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