近断层脉冲地震动对框剪结构的破坏作用分析
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摘要
近断层脉冲型地震动对结构具有巨大的潜在破坏作用,而有关高层钢筋混凝土框剪结构(HRCFS)受其影响的研究较少。为此,采用合成近断层脉冲型地震动(NPGM)的方法,合成了加速度峰值、脉冲速度峰值、脉冲速度峰值比及脉冲周期不同的NPGM,计算了一个22层HRCFS在上述地震动作用下的时程反应,分析了该HRCFS整体破坏指数随上述参数的变化。结果表明,该结构的整体破坏指数在上述地震动作用下的值均较小;随加速度峰值变化无明显规律;与脉冲速度峰值和脉冲速度峰值比近似呈线性增加的关系;与脉冲周期近似呈二次抛物线关系。由此说明,HRCFS在NPGM作用下具有良好的抗震性能,并且不能单独以加速度峰值作为表征NPGM对HRCFS破坏作用的参数。
Near-fault pulse ground motion is a large potential damage on structure,yet there is little research about couse. NPGMs with different peak ground acceleration( PGA),peak ground velocity( PGV),peak ground velocity ratio( PGVR) and pulse time period( Tp) are composited by NPGM method. Time history response of a22-floor HRCFS is calculated by inputting the above ground motions,and the variations of the overall structure damage index( OSDI) of HRCFS with the above parameters is analyzed. The result shows that all the values of OSDI are small without obvious relationship with PGA. OSDI changes with PGV and PGVRin a proximate linear relationship,and changes with Tpin a proximate para-curve relationship. It can be concluded that HRCFS has good seismic performance under the NPGMs; the damage effect of NPGM on HRCFS can't be measured by PGA only.
Near-fault pulse ground motion is a large potential damage on structure,yet there is little research about couse. NPGMs with different peak ground acceleration( PGA),peak ground velocity( PGV),peak ground velocity ratio( PGVR) and pulse time period( Tp) are composited by NPGM method. Time history response of a22-floor HRCFS is calculated by inputting the above ground motions,and the variations of the overall structure damage index( OSDI) of HRCFS with the above parameters is analyzed. The result shows that all the values of OSDI are small without obvious relationship with PGA. OSDI changes with PGV and PGVRin a proximate linear relationship,and changes with Tpin a proximate para-curve relationship. It can be concluded that HRCFS has good seismic performance under the NPGMs; the damage effect of NPGM on HRCFS can't be measured by PGA only.
引文
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[2]Somerville P G,Smith N F,Graves R W,et al.Modification of empirical strong ground motion attenuation relations to include amplitude and duration effects of rupture directivity[J].Seism.Res.Lett.,1997,68(1):199-222.
[3]Somerville P G,Graves R W.地震强地面运动的特征描述[J].何玉庆,译.国际地震动态,2006,327(3):12-18.
[4]李明,刘勇,孙哲哲,等.不同类型近断层脉冲型地震动对框架剪力墙结构的影响[C]//第21届全国结构工程学术会议论文集,北京:中国力学学会工程力学编辑部,2012:49-52.
[5]李明.近断层地震动对结构抗震设计的影响研究[D].哈尔滨:中国地震局工程力学研究所,2010.
[6]公茂盛,鹿嶋俊英,谢礼立,等.基于结构强震记录的结构时变模态参数识别[J].振动与冲击,2010,29(5):171-175.
[7]赵凤新,韦韬,张郁山.近断层速度脉冲对钢筋混凝土框架结构地震反应的影响[J].工程力学,2008,25(10):180-188.
[8]李爽,谢礼立,郝敏.地震动参数及结构整体破坏相关性研究[J].哈尔滨工业大学学报,2007,39(4):506-512.
[9]李明,谢礼立,翟长海.近断层脉冲型地震动重要参数的识别方法[J].世界地震工程,2009,25(4):133-139.
[10]胡进军.近断层地震动方向性效应及超剪切破裂研究[D].哈尔滨:中国地震局工程力学研究所,2009.
[11]王栋.近断层地震动的上/下盘效应研究[D].哈尔滨:中国地震局工程力学研究所,2010.
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