Document Type : Original Article
Authors
1
Ph.D. Candidate. Department of Engineering, Islamic Azad University, Khomein, Iran
2
Assistant professor, Department of Engineering,, Islamic Azad University, Malayer, Iran
3
Assistant Professor, Department of Engineering, University of Qom, Qom, Iran
10.22065/jsce.2024.408750.3182
Abstract
Generally, the design of buildings must satisfy two criteria. First, under frequently occurring low to moderate earthquakes, the structure should have sufficient strength and stiffness to control deflection and prevent any structural damage. Second, under rare and severe earthquakes, the structure must have sufficient ductility to prevent collapse. In this research, the performance of a new innovative eccentrically and zipper element called Zipper Eccentrically Bracing Frame (ZEBF) is discussed and the behavior is investigated. A combination of eccentrically braced steel frames and Zipper element has been assessed and concepts of the design of defined schemes are reviewed. The ZEBF is made up of four structural elements, the zipper element, the diagonal brace element, the link element and the columns elements. The zipper and link elements are a fuse-like element that dissipates energy by the formation of plastic shear hinges or flexural hinges at its ends and midspan when the building is subjected to moderate and severe lateral loads, respectively. The knee element is a disposable beam element that can be replaced once its energy dissipation capacity is utilized. In large earthquakes, both of them contribute in dissipating energy. Three half-scale ZEBF were tested using the ATC protocol. The experimental results indicated that in this system, shear strength and cumulative dissipated energy can be significantly increased. The ultimate displacement to yield displacement ratio for the samples was 7. Also Incremental dynamic analysis has been used to evaluate the seismic capacity of the ZEBF using OpenSEES software. The structural models that represented 4, 8, and 12 story residential buildings (CBF, EBF and ZEBF) were subjected to the IDA process and their seismic performance was probabilistically quantified following the PBEE methodology. Numerical results show an improvement in the probability of collapse between 15 and 20 percent compared to other similar structural systems.
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