近场脉冲地震下混凝土框架结构特殊反应
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摘要
针对某十二层钢筋混凝土框架结构,通过比较分析近场脉冲地震和不含速度脉冲地震作用下结构从弹性到弹塑性的地震反应过程,深入探讨了近场速度脉冲对结构弹性及弹塑性地震反应的影响。结果表明:近场脉冲地震与不含速度脉冲地震作用引起的结构弹性地震反应差别不大,含速度脉冲地震会引起较大的结构弹塑性变形反应,尤其是顶层位移、层间位移和基底剪力会明显增加;规范反应谱不能充分体现速度脉冲对结构弹塑性地震反应的影响;近场脉冲型地震含有较丰富的低频成分,谱值随周期增大衰减较慢,长周期的谱值较大,将对长周期结构的影响较短周期结构明显。
The seismic response process of a 12-story reinforced concrete frame structure under near-field pulse-like and non-velocity pulse ground motion was investigated by comparison.The influence of near-field pulse-like ground motion was analyzed on the seismic response of the frame structure from elastic into elastic-plastic stage.The results show that the elastic seismic response of the structure had no significant difference under near-field pulse-like and non-velocity pulse ground motion.However,the structure response under near-field pulse-like ground motion was larger than that under non-velocity pulse in elastic-plastic stage.In particularly,top story displacement,storey drift and basic shear obviously increased.The response spectrum in current code could not sufficiently represent the effects of elastic-plastic seismic response on the structure under near-field pulse-like ground motion.The near-field pulse-like ground motion contained generous low frequency components and the spectrum values attenuated slowly along with the period.Hence,the spectrum values were greater and had distinct influence on long period structures than short period structures.
The seismic response process of a 12-story reinforced concrete frame structure under near-field pulse-like and non-velocity pulse ground motion was investigated by comparison.The influence of near-field pulse-like ground motion was analyzed on the seismic response of the frame structure from elastic into elastic-plastic stage.The results show that the elastic seismic response of the structure had no significant difference under near-field pulse-like and non-velocity pulse ground motion.However,the structure response under near-field pulse-like ground motion was larger than that under non-velocity pulse in elastic-plastic stage.In particularly,top story displacement,storey drift and basic shear obviously increased.The response spectrum in current code could not sufficiently represent the effects of elastic-plastic seismic response on the structure under near-field pulse-like ground motion.The near-field pulse-like ground motion contained generous low frequency components and the spectrum values attenuated slowly along with the period.Hence,the spectrum values were greater and had distinct influence on long period structures than short period structures.
引文
[1]李爽,谢礼立.近场问题的研究现状与发展方向[J].地震学报,2007,29(1):103-106.
[2]Alavi B,Krawinkler H.Consideration of near-fault motion effects in seismic design[C]∥Auckland,New Zealand 12WCEE,2000,New Zealanel:Auckland,2665.
[3]International Conference of Building official.Uniform Building Code[C]∥California International Conference of Build offi-cials,Whittier,1997.
[4]王京哲,朱晞.近场地震速度脉冲效应下的结构特殊响应[D].北京:北方交通大学,2003.
[5]赵凤新,张郁山.拟合峰值速度与目标反应谱的人造地震动[J].地震学报,2006,28(4):429-437.
[6]Mohd Hisham M Y.Nonlinear Analysis of Prestressed Concrete Structures under Monotonic and Cyclic Loads[D].Califor-nia:University of California,1994.
[7]Hall J F,Heaton T H,Hulling M W.Near-source ground motion and its effects on flexible buildings[J].Earthquake Spec-tra,1995,11(4):569-605.
[8]Hall J,Ryan K.Isolated buildings and the 1997 UBC near-source factors[J].Earthquake Spectra,2000,16(2):393-411.
[9]Jangid R,Kelly J.Base isolated for near-fault motions[J].Earthquake Engineering and Structural Dynamics,2001,30:691-707.
[10]李爽,谢礼立.近场脉冲型地震动对钢筋混凝土框架结构影响[J].沈阳建筑大学学报,2006,22(3):406-410.
[11]俞言祥,高孟谭.台湾集集地震近场地震动的上盘效应[J].地震学报,2001,23(6):615-621.
[2]Alavi B,Krawinkler H.Consideration of near-fault motion effects in seismic design[C]∥Auckland,New Zealand 12WCEE,2000,New Zealanel:Auckland,2665.
[3]International Conference of Building official.Uniform Building Code[C]∥California International Conference of Build offi-cials,Whittier,1997.
[4]王京哲,朱晞.近场地震速度脉冲效应下的结构特殊响应[D].北京:北方交通大学,2003.
[5]赵凤新,张郁山.拟合峰值速度与目标反应谱的人造地震动[J].地震学报,2006,28(4):429-437.
[6]Mohd Hisham M Y.Nonlinear Analysis of Prestressed Concrete Structures under Monotonic and Cyclic Loads[D].Califor-nia:University of California,1994.
[7]Hall J F,Heaton T H,Hulling M W.Near-source ground motion and its effects on flexible buildings[J].Earthquake Spec-tra,1995,11(4):569-605.
[8]Hall J,Ryan K.Isolated buildings and the 1997 UBC near-source factors[J].Earthquake Spectra,2000,16(2):393-411.
[9]Jangid R,Kelly J.Base isolated for near-fault motions[J].Earthquake Engineering and Structural Dynamics,2001,30:691-707.
[10]李爽,谢礼立.近场脉冲型地震动对钢筋混凝土框架结构影响[J].沈阳建筑大学学报,2006,22(3):406-410.
[11]俞言祥,高孟谭.台湾集集地震近场地震动的上盘效应[J].地震学报,2001,23(6):615-621.
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