Abstract
This study has been conducted to observe nonlinear time history analysis of a 3D-office building frame where performance has been examined in the presence of base isolation and a bracing system. This steel structure has an underground story surrounded by stiff well-graded sand and is assumed to be located in an intense seismic area. The static and dynamic experimental performance of a Rubber Friction Bearing (RFB) has been considered, and an equivalent numerical model has been used in finite element software, which provides a satisfactory relationship between experimental and numerical prediction. The results show that the story drift and post-earthquake damage of the frame reduced significantly due to the presence of RFB devices. These isolators are most effective in moderate earthquakes. The presence of a minimum number of Steel Buckling Restrained Braces (BRBs) systems improve structural performance under moderate and strong ground motions by reducing story drift and residual damage. Hollow Steel Section (HSS) and Concrete-Filled Steel Tube (CFST) sections have been used in the simulation process, and it was found that the HSS system is susceptible to damage even if both seismic protection systems have been considered. The findings provide important conclusions to select suitable seismic protection for this type of structure, which is limited by simulation study due to the absence of experimental observation.
Highlights
In comparison to other natural disasters, earthquakes (EQs) are the most common and do not provide significant signs prior to this unpredictable event
To improve the seismic performance, researchers [7,8,9,10] came up with different kinds of bracing systems, namely Steel Buckling-Restrained Braces (BRBs) and Concentrically Braced Frames (CBFs) equipped with complex energy dissipating devices [11,12,13], which show promising results and can be used as an effective tool to provide high-level sustainable performance by dissipating excessive nonstructural damage, resulting from story drift
The performance has been studied of two different column systems, 8H.SSCaondnCcFlSuT,swihoicnhsare used in an ordinary office building that is surrounded by stiff soil and located in a high-seismic metropolitan area
Summary
In comparison to other natural disasters, earthquakes (EQs) are the most common and do not provide significant signs prior to this unpredictable event. To improve the seismic performance, researchers [7,8,9,10] came up with different kinds of bracing systems, namely Steel Buckling-Restrained Braces (BRBs) and Concentrically Braced Frames (CBFs) equipped with complex energy dissipating devices [11,12,13], which show promising results and can be used as an effective tool to provide high-level sustainable performance by dissipating excessive nonstructural damage, resulting from story drift. That, ignoring the SSI influence may underestimate the damage that may appear after EQs. In this study, the active and passive force displacement behavior of soil has been considered in a simplified way to observe the frame response under moderate and strong ground motion, which is most of the time ignored in order to avoid complex calculation.
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