Simplified seismic design approach for hysteretic dampers incorporated in steel portal frame piers
A simplified seismic procedure is proposed for direct design of hysteretic damping system, which is to be incorporated into steel portal frame piers. This design procedure falls within the scope of performance-based design philosophy, taking account of quantitative performance-based indexes and nonlinear response spectra with various ductility levels. A step-by-step design process is proposed, in which two performance-based indexes, namely, displacement-based index and strain-based index, are used as predefined performance object to explore their reliability. In addition, several suggestions are made for design of hysteretic damping devices: buckling-restrained braces and shear panel dampers. Design examples are presented subsequently. To validate this procedure, nonlinear dynamic time-history analyses are performed using general-purpose program ABAQUS. The results have demonstrated that the proposed simplified design procedure is applicable to design damped bridge structures, attaining the expected performance level with sufficient accuracy for practical design purposes using either displacement-based index or strain-based index. © 2006 Taylor & Francis Group.