坡地地形对竖向地震动反应谱特性的影响分析
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摘要
为分析坡地地形对竖向地震动反应谱特性的影响规律,采用有限元数值分析方法,对黏弹性岩质坡地在白噪声输入下的响应进行计算。分析了坡地地形对场地竖向反应谱及谱比的影响,研究了随着坡高及坡角的增加,坡地斜坡段及平台段竖向反应谱及谱比的变化规律,给出了坡地斜坡段及平台段设计竖向地震动放大系数,有关的研究结论可为坡地上工程结构的抗震设计提供参考。
In order to discuss the influence of slope terrain on vertical ground motion response spectrum characteristics,the vertical seismic responses of the viscoelastic rock slopes excited by white noise were calculated by using the numerical finite element analysis method.The influences of slope terrain on the vertical ground motion response spectrum were analyzed.It is show that with the increase of the slope degree and slope height,the vertical response spectrum and the vertical spectrum ratios increase.The amplification factors of design vertical ground motions for the structures on the slope and the platform of slope terrain are suggested.
In order to discuss the influence of slope terrain on vertical ground motion response spectrum characteristics,the vertical seismic responses of the viscoelastic rock slopes excited by white noise were calculated by using the numerical finite element analysis method.The influences of slope terrain on the vertical ground motion response spectrum were analyzed.It is show that with the increase of the slope degree and slope height,the vertical response spectrum and the vertical spectrum ratios increase.The amplification factors of design vertical ground motions for the structures on the slope and the platform of slope terrain are suggested.
引文
[1]荣棉水,李小军.局部地形对出平面运动谱特性的影响分析[J].中国地震,2007,23(2):147-156.
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[7]荣棉水,李小军,吕悦军,等.平台地形地面运动特征周期值的影响[J].中国地震,2009,25(2):178-182.
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[9]李英民,王丽萍,赵耀.岩质坡地建筑设计水平地震动放大系数的确定[J].地震工程与工程振动,2010,30(4):11-17.
[10]Assimaki D,Gazetas G.Soil and topographic amplification on canyon banks and the 1999 Athens earthquake[J].JEE,2004,8(1):1-43.
[11]中华人民共和国建设部.GB11-2008建筑抗震设计规范[S].北京:中国建筑工业出版社,2008.
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[13]赵建锋,杜修力,韩强,等.外源波动问题数值模拟的一种实现方式[J].工程力学,2007,24(4):52-58.
[14]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64.
[15]杜修力,赵密.基于黏弹性边界的拱坝地震反应分析方法[J].水利学报,2006,37(9):1063-1069.
[2]Trifunac MD.Surface motion of a scmi-cylindrical valley for incident plane SH waves[J].Bulletin of the Seismological Society of America,1971,61:1755-1770.
[3]Wlong HL,Trifunac MD.Surface motion of a semi-elliptical alluvial valley for incident plane SHwaves[J].BSSA,1974,64:1389-1408.
[4]Lee V W.A note on scattering of elastic plane waves by a hemispherical canyon[J].Soil Dynamics and Earthquake Engineering,1982,1:122-129.
[5]刘晶波.局部不规则地形对地震地面运动的影响[J].地震学报,1996,18(2):239-245.
[6]李文华.SH波入射时两个等腰三角形凸起地形的相互作用[D].哈尔滨:哈尔滨工程大学,2006.
[7]荣棉水,李小军,吕悦军,等.平台地形地面运动特征周期值的影响[J].中国地震,2009,25(2):178-182.
[8]刘洪兵,朱②.地震中地形放大效应的观测和研究进展[J].世界地震工程,1999,15(3):20-26.
[9]李英民,王丽萍,赵耀.岩质坡地建筑设计水平地震动放大系数的确定[J].地震工程与工程振动,2010,30(4):11-17.
[10]Assimaki D,Gazetas G.Soil and topographic amplification on canyon banks and the 1999 Athens earthquake[J].JEE,2004,8(1):1-43.
[11]中华人民共和国建设部.GB11-2008建筑抗震设计规范[S].北京:中国建筑工业出版社,2008.
[12]刘晶波,杜义欣,闻秋实.黏弹性人工边界及地震动输入在通用有限元软件中的实现[J].防灾减灾工程学报,2007,27(1):37-42.
[13]赵建锋,杜修力,韩强,等.外源波动问题数值模拟的一种实现方式[J].工程力学,2007,24(4):52-58.
[14]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64.
[15]杜修力,赵密.基于黏弹性边界的拱坝地震反应分析方法[J].水利学报,2006,37(9):1063-1069.
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