Optimal Risk-Based Design of Linear Dampers for Seismic Retrofit of Buildings

Abstract eng:
This paper presents a probabilistic methodology for the optimal risk-based design of linear viscous/visco-elastic dampers in single and/or coupled buildings [1]. The uncertainties affecting both the seismic input and the model parameters are taken into account, as well as the correlation between the multiple limit states employed to describe the seismic performance. The design for a given performance objective is an inverse reliability problem and is cast in the form of an optimization problem. The procedure proposed in this paper for solving this problem is consistent with and can be incorporated into modern PBEE frameworks. Although the proposed approach is general, it is specialized in this study to the case of linear elastic systems in order to take advantage of existing analytical techniques for estimating the buildings’ structural response statistics [2]. The effectiveness of the proposed design methodology is illustrated by considering two steel buildings modeled as linear elastic multi-degree-of-freedom systems for different linear dampers’ types and collocation.

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