Study of seismic behavior and development of fragility curves of divergent braced frames under successive earthquakes
The potential for aftershocks vulnerability, even for many structures designed following valid seismic regulations, highlights the need to study various structural systems. Experiences of previous earthquakes and the results of studies on divergent braced frames indicate the proper ductility and stiffness of this seismic load-bearing system in the face of strong earthquakes. In the present paper, the seismic behavior of divergent braced frames under the main earthquake and aftershock has been studied. For this purpose, 4, 8, and 12 story buildings were subjected to increasing analysis, nonlinear time history, and incremental dynamics using selected aftershocks. Also, fragility curves for different levels of failure before and after the main earthquake were presented. The results show high strength and suitable bearing capacity of divergent braced frames under multiple earthquakes that can achieve high-performance levels.The potential for aftershocks vulnerability, even for many structures designed following valid seismic regulations, highlights the need to study various structural systems. Experiences of previous earthquakes and the results of studies on divergent braced frames indicate the proper ductility and stiffness of this seismic load-bearing system in the face of strong earthquakes. In the present paper, the seismic behavior of divergent braced frames under the main earthquake and aftershock has been studied. For this purpose, 4, 8, and 12 story buildings were subjected to increasing analysis, nonlinear time history, and incremental dynamics using selected aftershocks. Also, fragility curves for different levels of failure before and after the main earthquake were presented. The results show high strength and suitable bearing capacity of divergent braced frames under multiple earthquakes that can achieve high-performance levels.
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