Resumen

FERNANDEZ SOLA, Luciano R  y  AVILES LOPEZ, Javier. Efectos de interacción suelo-estructura en edificios con planta baja blanda. Ing. sísm [online]. 2008, n.79, pp.71-90. ISSN 0185-092X.

First soft-story structures are very vulnerable under the action of seismic forces. This is due principally to the lack of stiffness and strength in the soft story. The Complementary Technical Norms for Seismic Design of the RCDF handles this problem as a structural irregularity, just by reducing the seismic behavior factor controlling the design strengths. By doing this, the stiffness and strength capacity of the entire structure is increased, but the existing contrast between the soft story and the rest of the structure is not corrected. This work has developed a numerical model to estimate the dynamic response of first soft-story structures on soft soil. The model is elastic and takes into account the structural period increase due to the soil flexibility, as well as the damping increase due to the energy dissipation by wave radiation into the soil. Considering that the structural damping is distributed along the building, a classical damping matrix for the structure alone is assembled using modal damping. On the contrary, for the supporting soil, elemental damping is considered making use of viscous dashpots for each of the foundation vibration modes. Due to the lack of classic modes of vibration for the coupled soil-structure system, the structural response has to be obtained by the complex frequency-response method.

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