Liquefaction Analysis for Multidirectional Shaking

by Jamshid Ghaboussi, Assoc. Prof.; Dept. of Civ. Engrg., Univ. of Illinois at Urbana-Champaign, 2213 Civ. Engrg. Bldg., Urbana, Ill. 61801,
S. Umit Dikmen, Sr. Engr.; Engrg. Decision Analysis Co., Palo Alto, Calif.,

Serial Information: Journal of the Geotechnical Engineering Division, 1981, Vol. 107, Issue 5, Pg. 605-627

Document Type: Journal Paper


A method of analysis is presented for the evaluation of the seismic response and liquefaction of horizontally-layered level ground under multidirectional shaking. A new material model is introduced for representing the behavior of sand under cyclic biaxial shear stresses. The responses to multidirectional shaking are demonstrated through a series of case studies. These case studies were performed by using a new computer program LASS-III which was developed for analysis of multi-directional shaking of horizontally-layered ground. The results of a number of analyses are presented in which the influence of the vertical component base acceleration and the interaction between the two horizonal components of shaking are evaluated.

Subject Headings: Case studies | Soil liquefaction | Shear stress | Seismic tests | Seismic effects | Soil stress | Sand (material) | Biaxial strength

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