Seismic strengthening of a non-ductile reinforced concrete frame with soft-story mechanism using buckling-restrained braces
Conference proceedings article
Authors/Editors
Strategic Research Themes
No matching items found.
Publication Details
Author list: Khampanit A., Leelataviwat S.
Publisher: Hindawi
Publication year: 2013
eISSN: 1745-4557
Languages: English-Great Britain (EN-GB)
Abstract
This paper presents an application of the performance-based plastic design approach for the design of buckling-restrained braces to strengthen a non-ductile reinforced concrete frame with a soft-story mechanism. The selected building is a 5-story school structure that was designed primarily for gravity loads. An inelastic pushover analysis was performed to study the failure mechanism of the existing structure and to guide the selection of the performance target for seismic strengthening design. The energy balance equation was used to determine the required story shear strength and the capacity of the braces in each story. Both the design basis earthquake and the maximum considered earthquake levels were considered. To evaluate seismic performance of the strengthened frame, nonlinear time history analyses were carried out using 20 ground motion records representing large-magnitude-large-range earthquakes and 20 records representing large-magnitude-short- range earthquakes. All of the ground motion records were scaled according to the seismic design standard of Thailand. The analysis results of the strengthened frame show significant response improvement in terms of structural performance and story drifts. The results show that the presented approach can be used as a tool in strengthening design of non-ductile reinforced concrete frames to meet pre-selected performance targets.
Keywords
Brbs, Non-ductile RC frame, Performance-based plastic design, Soft-story, Strengthening
Contact Information