engleski

Soil-structure interaction effects on seismic behaviour of reinforced concrete frames

It is often the case that soil beneath the structure is ignored in numerical analyses. In most cases there are two reasons for neglecting the soil in analyses: complexity in modelling of the soil and, as mostly believed, beneficial effects of the soil on structures. The paper discusses three different approaches on numerical modelling of fixity of structures with the soil beneath: conventionally fixed structure, structure on Winkler springs and structure on half-space. Linear elastic analysis was carried out on three- , seven- and ten-story three-bay reinforced concrete frames using time history analysis. All of the structures were founded on soft soil as defined according to Eurocodes. Ground motions used were selected from the European Strong-Motion Database. Also, the paper gives outline of recommendations on including soil-structure interaction in structural models according to European and American seismic regulations and highlights detrimental effects of soil- structure interaction on low-rise buildings.

soil - structure interaction; seismic behaviour; reinforced concrete; numerical model; soft soil

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