Resumen

FERNANDEZ-SOLA, Luciano Roberto; ZAMORA-BENITEZ, Gerardo Yeshua  y  TAPIA-GARCIA, Carlos A.. Influence of subsidence and soil nonlinearity effects on the fundamental period of a building considering dynamic soil-structure interaction effects. Ing. sísm [online]. 2024, n.113, pp.1-25.  Epub 07-Mar-2025. ISSN 0185-092X.  https://doi.org/10.18867/ris.113.667.

The fundamental period of structures on soft soils is strongly influenced by soil properties due to Dynamic Soil Structure Interaction effects (DSSI). Due to high plasticity and flexibility of soils in Mexico City, large DSSI effects are expected. Approaches used in most of building codes around the world, suppose linear soil behavior, so the use of equivalent linear values for soil shear modulus is recommended. In addition, Mexico City is subjected to a subsidence effect which produces variations of soil properties along time. The influence of soil nonlinear behavior and subsidence effects on the structural fundamental period of a 16-story building on the Mexico City soft soil considering DSSI effects is studied. The influence of soli nonlinear behavior and subsidence is taken into account by using different values of soils shear modulus. The periods with DSSI were computed following the procedure of the Mexico City Building Code and compared with those obtained with a numerical model. Foundation dynamic stiffness is computed with a commercial software considering the group effects for the frictional piles. Subsidence effect substantially shortens the fundamental period over the time, while soil softening effects seems to be not too significant.

Palabras llave : subsidence; soil stiffness degradation; dynamic soil structure interaction.

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