Quantification of seismic performance factors of beam-through steel frames with self-centering modular panel and replaceable hysteretic dampers

Abstract

In recent years, self-centering modular panels (SCMPs) are proposed as a prefabricated portable lateral-load resisting member for potential application to new structure installation or seismic retrofit of existing structures. Several types of seismic fuse devices have been studied for implementation in the SCMPs, including tension-only braces, slit steel plate shear walls and replaceable hysteretic dampers (RHDs). Previous experimental testing and numerical simulation study results have demonstrated that these SCMPs show flag-shaped hysteretic response with anticipated seismic behavior. This study is focused on quantifying the seismic performance factors, including the response modification coefficient (R), the system overstrength factor (Ω0), and the deflection amplification factor (Cd), to enable seismic design of future SCMP structural systems in compliance with FEMA P695 procedure. The beam-through steel frames (BTSFs) with SCMPs installed into are used as an example to showcase the procedure. Numerous BTSF-SCMP-RHDs buildings, arranged in four performance groups (PGs), were designed as prototype structures based on assumed performance factor values. Next, these structures are investigated through nonlinear static analysis and incremental dynamic analysis. From this study, the response modification coefficient, the overstrength factor and deflection amplification factor are concluded to be 6.0, 3.0 and 6.0, respectively for the BTSF-SCMP-RHD structures. The results also indicate that the initial pre-stress level of post-tension (PT) cables has a major influence on the overstrength factor and collapse resistance capacity of BTSF-SCMP-RHDs system.