Displacement-Based Seismic Design of In-Plan Asymmetric Buildings With Damage Control

Abstract eng:
This paper presents a procedure for the displacement-based seismic design of in-plan asymmetric buildings with control of earthquake-induced damage. The method is based on the assumption that the maximum seismic response of a structure may be estimated for design purposes through a reference single degree of freedom system with inelastic behaviour, all this by applying basic equations of structural dynamics commonly used in current seismic design of buildings. The simultaneous bidirectional seismic demand is approximated by using smoothed design spectra as those proposed by currently used design regulations. To illustrate the steps required in the application of the design method proposed the displacement-based design of an in-plan asymmetric 15-storey reinforced concrete building subjected to a particular bidirectional seismic demand, representative of the horizontal acceleration records obtained at soft soils conditions as those of the lake-bed zone of Mexico City. The results obtained from this design method are compared with those obtained from the non-linear step by step dynamic analysis of the building when subjected to the same records for which was originally designed. Based on such comparison, the authors conclude that the method proposed allows a satisfactory design of this type of structures.

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