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A platform for research: civil engineering, architecture and urbanism
Structure-foundation interaction in the earthquake response of torsionally asymmetric buildings
Abstract A detailed parametric study is made of torsional coupling in earthquake-excited asymmetric buildings including the effects of soil-structure interaction. The objectives are to assess the changes in the lateral-torsional earthquake response of such structures in relation to rigidly based buildings, and to make appropriate comparisons with current codified seismic provisions for coupling effects by empirical design procedures based on rigid base analysis of asymmetric buildings. The response of an idealised elastic structure-foundation model has been evaluated when subjected to free-field earthquake input motions represented by design spectra. These spectra account for localised site effects over the range of soil foundation properties for which significant interaction effects are expected. It has been found that for short and long period structures, torsional provisions based on analyses of rigidly based buildings also suffice for those supported on flexible foundations. However, for intermediate height buildings with moderate or large eccentricity, increased torsional loadings must be specified to account conservatively for the accentuation of the combined lateral-torsional response for such structures when supported on moderately flexible and very flexible foundations. Some recommendations for implementing such provisions in building codes have been outlined.
Structure-foundation interaction in the earthquake response of torsionally asymmetric buildings
Abstract A detailed parametric study is made of torsional coupling in earthquake-excited asymmetric buildings including the effects of soil-structure interaction. The objectives are to assess the changes in the lateral-torsional earthquake response of such structures in relation to rigidly based buildings, and to make appropriate comparisons with current codified seismic provisions for coupling effects by empirical design procedures based on rigid base analysis of asymmetric buildings. The response of an idealised elastic structure-foundation model has been evaluated when subjected to free-field earthquake input motions represented by design spectra. These spectra account for localised site effects over the range of soil foundation properties for which significant interaction effects are expected. It has been found that for short and long period structures, torsional provisions based on analyses of rigidly based buildings also suffice for those supported on flexible foundations. However, for intermediate height buildings with moderate or large eccentricity, increased torsional loadings must be specified to account conservatively for the accentuation of the combined lateral-torsional response for such structures when supported on moderately flexible and very flexible foundations. Some recommendations for implementing such provisions in building codes have been outlined.
Structure-foundation interaction in the earthquake response of torsionally asymmetric buildings
Sikaroudi, H. (author) / Chandler, A.M. (author)
Soil Dynamics and Earthquake Engineering ; 11 ; 1-16
1990-12-17
16 pages
Article (Journal)
Electronic Resource
English
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