Equivalent number of uniform stress cycles for soil liquefaction analysis

被引:120
作者
Liu, AH [1 ]
Stewart, JP
Abrahamson, NA
Moriwaki, Y
机构
[1] Univ Calif Los Angeles, Dept Civil & Environm Engn, Los Angeles, CA 90095 USA
[2] Pacific Gas & Elect Co, San Francisco, CA 94106 USA
[3] GeoPentech, Santa Ana, CA USA
关键词
D O I
10.1061/(ASCE)1090-0241(2001)127:12(1017)
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The seismic demand on potentially liquefiable soils can be approximated by a series of uniform shear stress cycles. Procedures are reviewed for converting an arbitrary acceleration time history to a series of uniform cycles with amplitude = 0.65 of the peak. The number of cycles (N) at this amplitude is evaluated so as to represent a seismic demand for liquefaction triggering equivalent to that of the accelerogram. An assumed relationship between N and magnitude (m) underlies so-called magnitude scaling factors used to adjust the liquefaction resistance of soil for the effects of duration/magnitude. Scaling factors can alternatively be related directly to N, which enables the effects of factors other than m (for example, site-source distance r) to be quantified. We develop empirical models for N that are applicable to active tectonic regions and find a strong dependence on in and r and a weaker dependence on site condition and near-fault rupture directivity effects. The model for N is used to develop new scaling factors for soil liquefaction resistance that are distance-dependent and have a defined level of uncertainty.
引用
收藏
页码:1017 / 1026
页数:10
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