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The seismic design of structures generally considers a fixed base assumption, thus neglecting interaction with the supporting soil. The main structural property considered is usually the fundamental period. However, when the influence of soil-foundation-structure interaction (SFSI) is taken into account, other parameters such as structural slenderness, may play an important role in the response. Current design codes, (e.g. FEMA-440 and FEMA450), assume that SFSI always has beneficial effects in the form of a reduction in the fundamental period spectral acceleration or base shear. This assumption has been studied and discussed by several authors. Additionally, in major urban areas structures are generally closely adjacent, and this situation is more complex than that of a structure whose response may be considered independent of all others. This study sets-out to improve the understanding of the behaviour of a clustered structure-soil-structure system. A 2D numerical model is used to simulate the behaviour of single and multiple structures on sand considering a range of slenderness ratios. Linear single degree-of-freedom (SDOF) structures and nonlinear soil are considered. The role of key parameters, e.g. effective building period and slenderness ratio of the structure-foundation system, will be elucidated.

NUMERICAL ANALYSES OF THE INFLUENCE OF STRUCTURAL SLENDERNESS ON THE SEISMIC RESPONSE OF SINGLE AND CLUSTERED STRUCTURES