A Displacement Based Seismic Design Method Considering Damage Control and Passive Dissipation of Energy for Buildings

Abstract eng:
Supplemental damping is being used for seismic damage control purposes in the retrofit of existing and the design of new buildings. In this paper this goal is achieved by introducing within a displacement-based design procedure, devices that dissipate part of the input earthquake energy, and thereby reduce the displacements of the structural systems to meet those considered as targets. This paper briefly describes a displacement-based seismic design procedure for frame structures considering the use of linear viscous dampers and damage control. In order to consider the non-proportional damping produced by the viscous dampers, in a conventional modal spectral analysis the effect of non-proportional damping matrix is approximated by equivalent modal damping ratios. The framework of this method is constructed around the concept of a reference system, defined as the bilinear single degree of freedom system associated to the properties of the fundamental mode of the inelastic multi degree of freedom system, from which its performance under seismic design conditions may be approximated. As illustrative example, the displacement-based design of a 12 storey reinforced concrete irregular frame with added linear viscous dampers is presented. The considered seismic demand is the E-W component of the Mexico, 1985 Michoacan earthquake recorded at the SCT site. In this example, it is observed that the performance calculated with a nonlinear step by step analysis, for a structure designed with the procedure proposed, represents, with a good approximation, the target design performance.

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