FULLY COUPLED INELASTIC SITE RESPONSE ANALYSIS FOR 1986 LOTUNG EARTHQUAKE

Two major earthquakes (M= 6.2 and M= 7) with different characteristics took place in the eastern coast of Taiwan in 1986 within a 4-month period. A test site at Lotung was located near the epicenters of the two quakes. The site was instrumented with three-dimensional (3D) surface and downhole accelerometer arrays and pore-pressure transducers embedded at depths from 3 to 16 m below the ground surface. Field investigation of the site, including sampling “undisturbed” soils, was carried out before the two events, and followed by a laboratory test program aimed at gaining detailed soil properties. Based on the available information, numerical analyses were performed using a fully coupled, multidirectional dynamic procedure incorporating a bounding surface hypoplasticity model. The calculated responses for the two different events showed equally reasonable agreements with the field records in both 3D acceleration and pore-pressure time histories. This paper reports the methodology of the analyses and presents...

[1]  M. Biot.  General Theory of Three‐Dimensional Consolidation , 1941 .

[2]  Yannis F. Dafalias,et al.  BOUNDING SURFACE PLASTICITY, I: MATHEMATICAL FOUNDATION AND HYPOPLASTICITY , 1986 .

[3]  Chin Man Mok,et al.  Inference of Dynamic Shear Modulus from Lotung Downhole Data , 1996 .

[4]  Zhi-Liang Wang,et al.  Bounding Surface Hypoplasticity Model for Sand , 1990 .

[5]  O. C. Zienkiewicz,et al.  DRAINED, UNDRAINED, CONSOLIDATING AND DYNAMIC BEHAVIOUR ASSUMPTIONS IN SOILS , 1980 .

[6]  T. Holzer,et al.  Dynamics of Liquefaction During the 1987 Superstition Hills, California, Earthquake , 1989, Science.

[7]  Ahmed Elgamal,et al.  LOTUNG DOWNHOLE ARRAY. I: EVALUATION OF SITE DYNAMIC PROPERTIES , 1995 .

[8]  Joseph Penzien,et al.  Engineering analyses of smart 1 array accelerograms , 1982 .

[9]  Kenji Ishihara,et al.  PORE WATER PRESSURES MEASURED IN SAND DEPOSITS DURING AN EARTHQUAKE , 1981 .

[10]  X. Li,et al.  The Role of Rotational Shear in Site Response Analyses , 1995 .

[11]  O. C. Zienkiewicz,et al.  An analytical solution for the transient response of saturated porous elastic solids , 1984 .

[12]  Ahmed Elgamal,et al.  Lotung Downhole Array. II: Evaluation of Soil Nonlinear Properties , 1995 .

[13]  Nathan M. Newmark,et al.  A Method of Computation for Structural Dynamics , 1959 .

[14]  P. B. Schnabel.  SHAKE-A Computer Program for Earthquake Response Analysis of Horizontally Layered Sites , 1970 .

[15]  X. Li.  Rotational shear effects on ground earthquake response , 1997 .

[16]  Kenji Ishihara,et al.  Simple Method of Analysis for Liquefaction of Sand Deposits During Earthquakes , 1977 .

[17]  M. Biot.  THEORY OF ELASTICITY AND CONSOLIDATION FOR A POROUS ANISOTROPIC SOLID , 1955 .

[18]  T. Leslie Youd,et al.  LATERAL STRESS IN SANDS DURING CYCLIC LOADING , 1975 .

[19]  M. Power,et al.  Development of Shear Modulus Reduction Curves Based on Lotung Downhole Ground Motion Data , 1991 .

[20]  K. Ishihara,et al.  LIQUEFACTION OF K0-CONSOLIDATED SAND UNDER CYCLIC ROTATION OF PRINCIPAL STRESS DIRECTION WITH LATERAL CONSTRAINT , 1985 .

[21]  Jean H. Prevost,et al.  Effective stress analysis of seismic site response , 1986 .

[22]  H B Seed,et al.  Influence of Seismic History on Liquefaction of Sands , 1977 .

[23]  Thomas J. R. Hughes,et al.  Improved numerical dissipation for time integration algorithms in structural dynamics , 1977 .

[24]  Jiro Kuwano,et al.  PORE WATER PRESSURES AND GROUND MOTIONS MONITORED DURING THE 1985 CHIBA-IBARAGI EARTHQUAKE , 1987 .

[25]  O. Zienkiewicz,et al.  Dynamic behaviour of saturated porous media; The generalized Biot formulation and its numerical solution , 1984 .