A Displacement-Based Seismic Design Procedure with Local Damage Control, Dissipated Energy and Resilience

This paper proposes a seismic design procedure for reinforced concrete buildings based on local displacements including energy and damage control. The procedure is based on the assumption that the performance of a multi-degree of freedom non-linear system can be approximated from the performance of a single-degree-of-freedom reference system generally associated to the fundamental mode of the building. The behaviour curve of this system is constructed from the frequency results of two spectral modal analyses corresponding to an undamaged (elastic) structure and to the same structure with the damage distribution accepted to occur under design conditions. The inelastic displacement is determined based on a rotation level proposed in the design at the ends of the beams for the level where the maximum interstory drift is presented. Finally, through a damage index defined by the ratio between the hysteretic energy and the input energy, the dissipated energy and the resilience indices are related for design decision-making, e.g. repair cost. It is shown that with this design method, it is possible to guarantee the design objectives and to control not only the distribution and level of damage expected for a given design demand but also the time and costs associated to recovery of functionality.