This paper presents the stability analysis of a tall building with mat foundationudfounded on liquefaction susceptible soil during design earthquake. The stability of a structuraludfoundation and structure itself is mainly depends on the bearing capacity of underlying soiludduring and after earthquake. Since modulus of subgrade reaction or stiffness of the soil is audconceptual relation between the soil pressure and deflection, it can be changed withudfluctuation of net allowable bearing capacity of underlying soil. Bearing capacity of the soil canudalso be changed according with the value of liquefaction potential. The loss of spring stiffnessudoccurred more or less depending on degree of liquefactions. Modification of localized springudstiffness of the foundation is carried out by numerical method. For a typical 2 unit 10 storeyudbuilding, the stress states were chosen at a depth of 12 ft. It belongs to seismic zone 2A.udETABS software is used as a design aid for performance of numerical completion for theudanalysis of model. The focus of this paper is to study the influence of liquefaction potential onudmodifying spring stiffness of the soil under the building and potential failure modes of theudbuilding to be considered in soil structure interaction.
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