三维竖向断层场地对地面运动的影响
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摘要
实际工程场地中的断层通常具有三维尺寸,应进行三维分析。本文考虑均匀弹性半空间内存在不同长度、深度的三维断层,由下向上垂直入射一个脉冲波,主要采用三维时域显式有限元结合透射人工边界的方法及相应编写的三维显示有限元波动程序DSI3,计算断层附近地震地面运动的时程反应,研究含有三维断层场地地面运动的一些特点,并与自由场反应对比,以说明三维竖向断层对地震波传播的特点和对断层附近地面运动的影响。
Since the fault sites in engineering have three-dimensional size,the effect of fault sites on the ground motions should be rationally considered only when three-dimensional analysis is performed. In this paper,the homogeneous elastic half space,in which a few three-dimensional fault sites with different lengths and depths are chosen,is analyzed.Every fault site is subjected to a vertical upward pulse wave.The three dimensional explicit finite element schemes with multi-transmitting boundary condition are employed and the corresponding three-dimensional explicit finite element program DSI3 is developed in the present analysis.To show the effect of faults on the ground motions near the fault sites,the seismic response time histories outside the faults are computed and compared with those in free half space.The results demonstrate the effects of vertical cracks on the propagation of seismic waves and the ground motions near the fault site.
Since the fault sites in engineering have three-dimensional size,the effect of fault sites on the ground motions should be rationally considered only when three-dimensional analysis is performed. In this paper,the homogeneous elastic half space,in which a few three-dimensional fault sites with different lengths and depths are chosen,is analyzed.Every fault site is subjected to a vertical upward pulse wave.The three dimensional explicit finite element schemes with multi-transmitting boundary condition are employed and the corresponding three-dimensional explicit finite element program DSI3 is developed in the present analysis.To show the effect of faults on the ground motions near the fault sites,the seismic response time histories outside the faults are computed and compared with those in free half space.The results demonstrate the effects of vertical cracks on the propagation of seismic waves and the ground motions near the fault site.
引文
[1]胡聿贤.地震工程学[M].北京,地震出版社,1988.
[2]Dineva P S,Manolis G D,Rangelov TV.Transient seismic wave propagation in a multilayered cracked geological region[J].J.Sou.&Vib.,2004,273:1-32.
[3]廖振鹏.工程波动理论导引[M].北京:科学出版社,1996.
[4]杨笑梅,王海涛,杨柏坡.竖向地裂缝附近的地面运动[J].地震工程与工程振动,2005,25(5):34-40.
[5]杨笑梅,王海涛,杨柏坡.竖向断层场地地面运动的影响[J].地震工程与工程振动,2006,26(5):7-13.
[2]Dineva P S,Manolis G D,Rangelov TV.Transient seismic wave propagation in a multilayered cracked geological region[J].J.Sou.&Vib.,2004,273:1-32.
[3]廖振鹏.工程波动理论导引[M].北京:科学出版社,1996.
[4]杨笑梅,王海涛,杨柏坡.竖向地裂缝附近的地面运动[J].地震工程与工程振动,2005,25(5):34-40.
[5]杨笑梅,王海涛,杨柏坡.竖向断层场地地面运动的影响[J].地震工程与工程振动,2006,26(5):7-13.
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