Effect of chevron, single and cross bracing in optimized planar steel braced frames on the mitigating progressive collapse

• Main Authors: Jahangiri, Vahid, Maghfouri, Mehdi, Ghadiri, Seyed Mohammadreza
• Format: Article
• Published: Springer Science and Business Media Deutschland GmbH 2024
• Subjects: TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.um.edu.my/44910/
• Institution: Universiti Malaya

Improving the behavior of structures can be a vital requirement in order to the enhancement of the building strength against progressive collapse. To investigate this, structural optimization methods are used to cost-effectively design three types of steel moment frames, namely chevron-, single- and cross-braced frames. The frames were assessed by using an alternative path method (APM), based on the General Services Administration (GSA) code, as well as the linear static analysis. One meta-heuristic algorithm was also used to optimize different layouts of braced frames. In this regard, eighteen different steel frames in five and ten-story buildings with four-bay steel dual systems, which are combined with chevron-, single- and cross-braced frames, were assumed to investigate the vertical displacements and weight of the structures through OpenSees, MATLAB and “TEKLA structures” software. However, the design requirements were on the basis of “LRFD360-10” and “GSA2003” code provisions. The studied models were subjected to different scenarios of one-column sudden removal on the ground floor. The obtained results showed that the chevron-braced frame has the desired structural behavior for the progressive collapse due to less value of vertical displacements in the location of column removal, and can be more economical in comparison with single- and cross-braced frame optimized weight of the structures. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.