A NEW SEISMIC DESIGN METHOD BASED ON LOCAL DISPLACEMENT CONTROL AND DAMAGE DISTRIBUTION
DOI:
https://doi.org/10.18867/ris.114.689Keywords:
displacement-based design, local displacements, damage control, reference system, resilience-based designAbstract
This paper presents the proposal of a new displacement-based seismic design methodology for reinforced concrete structures, considering as design objectives the control of local displacements and damage distribution. This methodology is based on the hypothesis that the nonlinear response of a multi-degree of freedom system can be approximated by a single-degree of freedom reference system, generally associated with the fundamental mode or the mode with the highest participation factor. The response curve of the reference system is constructed from the results of two eigen analyses, corresponding to the undamaged (elastic) structure and the structure with an assumed damage distribution under design conditions. The inelastic displacement of the reference system is defined as a function of an allowable plastic rotation in the beams of the critical floor where the maximum drift occurs. The application of this design method is illustrated by the design of three reinforced concrete frames of 5, 8 and 12 stories. The results obtained with the method are compared with those obtained from non-linear dynamic analyses using the same data sets records that define the spectrum used for the design. The results show that the method ensures not only the fulfilment of the design objectives, but also the control of the local damage intensity and its global distribution. Finally, the advantages of the proposed method are highlighted, positioning it as a solid basis for resilience-based seismic design approaches.
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