强震下钢筋混凝土柱残余位移研究
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摘要
针对钢筋混凝土柱定义了残余位移系数,然后选取了20条地震波,通过非线性时程分析,研究了强震下钢筋混凝土柱残余位移的影响因素。结果表明:随着钢筋屈服强度、配筋率或轴压比的增大,柱顶屈服位移变大;随着钢筋屈服强度或配筋率的减小、轴压比和柱顶残余位移系数增大;柱顶屈服位移和残余位移系数与混凝土强度关系不大;当轴压比变大时,配筋率对柱顶残余位移系数的影响更大;当配筋率变大时,轴压比对柱顶残余位移系数的影响变小。
Residual displacement ratio was defined for the RC( reinforced concrete) column,and the factors influencing the residual displacement of the RC column under strong earthquake are investigated by way of nonlinear time history analyses using 20 earthquake records. The results show that the yield displacement at the top of the RC column arises with the increase of steel reinforcement yield strength,reinforcement ratio or axial compression ratio,while the residual displacement ratio at the top of the RC column augments with the drop of steel yield strength or reinforcement ratio and the increase of axial compression ratio. The yield displacement and residual displacement ratio has little relation to the concrete strength. The effect of the reinforcement ratio on the residual displacement ratio at the top of the column gets more remarkable for the larger axial compression ratio,while the effect of axial compression ratio on the residual displacement ratio at the top of the column is less with the increase of the reinforcement ratio.
Residual displacement ratio was defined for the RC( reinforced concrete) column,and the factors influencing the residual displacement of the RC column under strong earthquake are investigated by way of nonlinear time history analyses using 20 earthquake records. The results show that the yield displacement at the top of the RC column arises with the increase of steel reinforcement yield strength,reinforcement ratio or axial compression ratio,while the residual displacement ratio at the top of the RC column augments with the drop of steel yield strength or reinforcement ratio and the increase of axial compression ratio. The yield displacement and residual displacement ratio has little relation to the concrete strength. The effect of the reinforcement ratio on the residual displacement ratio at the top of the column gets more remarkable for the larger axial compression ratio,while the effect of axial compression ratio on the residual displacement ratio at the top of the column is less with the increase of the reinforcement ratio.
引文
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[2]Christopoulos C,Pampanin S.Towards performance-based seismic design of MDOF structures with explicit consideration of residual deformations[J].Journal of Earthquake Technology,2004,41(1):53-73.
[3]Japan Road Association.Design Specifications of Highway Bridges.PartⅤ:Seismic Design[M].Tokyo:Maruzen Publishing Company,1996.
[4]Macrae G A,Kawashima K.Post-earthquake residual displacements of bilinear oscillators[J].Earthquake Engineering and Structural Dynamics,1997,26:701-716.
[5]Kawashima K,Macrae G A,Hoshikuma J,et al.,Residual displacement response spectrum[J].Journal of Structural Engineering,1998,124:523-530.
[6]Ruiz-Garcia J.,Miranda E.Residual displacement ratios for assessment of existing structures[J].Earthquake Engineering and Structural Dynamics,2006,35(3):315-336.
[7]李芳宝,朱晞.近场具有脉冲地层运动的单自由度双线性结构残余位移比谱[J].中国铁道科学,2007(3):49-55.LI Fangbao,ZHU Xi.Residual Displacement Ratio Spectrum of Single Degree of Freedom Bilinear Structure unde Ground Motions with Pulse in Near Fault Zones[J].China Railway Science,2007(3):49-55.
[8]欧阳承新,刘畅.单自由度体系的地震残余变形研究[J].世界地震工程,2010(1):143-146.OUYANG Chengxin,LIU Chang.Residual displacement of SDOF system under earthquakes[J].World Earthquake Engineering,2010(1):143-146.
[9]贡金鑫,程玲,张勤.结构静力非线性分析与弹塑性时程分析结果的统计关系及残余变形计算[J].建筑结构学报,2011(12):224-234.GONG Jinxin,CHEN Ling,ZHANG Qin.Statistical relationship between results of static nonlinear analysis and elasto-plastic time-history and calculation of residual deformation for structures[J].Journal of Building Structures,2011(12):224-234.
[10]Silvia Mazzoni,Frank Mc Kenna,Michael H Scott,et al.Open system for earthquake engineering simulation user command-Language manual,Open Sees version 1.7.3,2006.
[11]Pacific Earthquake Engineering Research Center.PEER Ground Motion Database[DB].http://peer.berkeley.edu/peer_ground_motion_database,2010.
[12]中华人民共和国住房与城乡建设部.建筑抗震设计规范(GB 50011-2010)[S].北京:中国建筑工业出版社,2010.GB.50011-2010,Code for seismic design of buildings[S].Beijing:China Architecture Industry Press,2010.
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