Honors College Thesis
 

Post-Earthquake Performance Assessment of Steel Strongback Braced Frames

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  • Traditional braced frames are an efficient and economic means of resisting seismic demands. However, braced frames are prone to story mechanisms, which can result in concentrations of demands and damage during seismic events. Including steel strongbacks in conjunction with traditional braced frames can mitigate story mechanisms. The SBF results in a near-uniform story drift profile, such that the structural damage is distributed more evenly across the building height as opposed to concentrated damage in one or a few stories, mitigating story mechanisms and increasing structural performance. Nevertheless, since the braced frame can no longer form a story mechanism, significant accelerations can arise due to near-elastic higher-mode effects, which have the potential to increase damage to acceleration-sensitive nonstructural components, resulting in reduced nonstructural performance. This work investigates the performance of a four-story steel Strongback Braced Frame (SBF) in comparison to a traditional Buckling Restrained Braced Frame (BRBF). The numerical analysis program OpenSees was utilized to create models of the SBF and BRBF archetypes. Data from OpenSees was post-processed and inputted into the performance-based assessment tool, PACT. Results showed that the strongback had increased structural performance due to uniform drifts, but reduced performance in both drift, and acceleration sensitive nonstructural components.
  • Key Words: Performance-Based Engineering, Seismic Design, Buckling Restrained Braced Frame, Steel Strongback Braced Frame, ATC Hazard Tool, PACT, OpenSees
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