Abstract
Abstract This paper presents a procedure for the displacement-based seismic design of in-plan asymmetric buildings with earthquake-induced damage control. Damage is defined on the structural elements in the in-plan and elevation layout of the structure. The proposed method is based on the concepts of the performance-based seismic design philosophy and the application of basic equations of structural dynamics that are regularly used for the current design of buildings. In its application, the simultaneous bidirectional seismic demand is characterized by smooth design spectrum as proposed by most current regulations. To illustrate the steps required in the application of the design method proposed, the paper presents the design process of a 15- and 12-story buildings with in-plan asymmetric distribution of stiffnesses and subjected to a design demand given by the spectrum a real seismic event representative of soft soil sites such as those of the bed-lake of Mexico City. The results obtained are compared with the corresponding results of the nonlinear dynamic step-by-step analyses under the same seismic demand. Based on the results obtained, the relevance of this procedure in the displacement-based seismic design of asymmetric buildings and the implications for its consideration in future regulations are discussed. Graphical Abstract
Highlights
For the design of buildings for limit states involving structural damage, most seismic codes accept the use of a forcebased procedures, using, with certain restrictions, the static method or, without restrictions, dynamic methods such as modal spectral analysis, regardless of the fact that the seismic effects on structures are better represented by displacement-based design procedures
Based on the assumption that an approximation to the nonlinear performance of a multiple degrees of freedom (MDOF) structure may be obtained from the performance of a reference single degree of freedom (SDOF) structure, generally associated with the fundamental mode of the buildings and with the recognition of the advantages of a displacement-based design approach over the conventional force-based design procedures recommended by most seismic design codes for building structures, in this paper, the authors propose a new displacement-based seismic design method that guarantees the target performances, allowing for an appropriate control of earthquake-induced damage of in-plan asymmetric buildings
This paper presents a procedure for the displacement-based seismic design of in-plan asymmetric buildings considering nonlinear behavior and control of structural damage
Summary
For the design of buildings for limit states involving structural damage, most seismic codes accept the use of a forcebased procedures, using, with certain restrictions, the static method or, without restrictions, dynamic methods such as modal spectral analysis, regardless of the fact that the seismic effects on structures are better represented by displacement-based design procedures. Based on the assumption that an approximation to the nonlinear performance of a multiple degrees of freedom (MDOF) structure may be obtained from the performance of a reference single degree of freedom (SDOF) structure, generally associated with the fundamental mode of the buildings and with the recognition of the advantages of a displacement-based design approach over the conventional force-based design procedures recommended by most seismic design codes for building structures, in this paper, the authors propose a new displacement-based seismic design method that guarantees the target performances, allowing for an appropriate control of earthquake-induced damage of in-plan asymmetric buildings. The results obtained are compared with the corresponding results obtained from nonlinear step-by-step analyses, showing an acceptable correspondence with the interstory drift used as a target design performance index
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