Evaluating the Impact of Seismic Sequence on Low Cycle Fatigue Failure in the Connections of Performance-Based Optimization Steel Moment Frames
Subject Areas : Analysis of Structure and Earthquake
1 - Department of Civil Engineering, Garmi Branch, Islamic Azad University, Garmi, Iran
Keywords: Low-cycle fatigueT, damage index, Performance-based optimization, Seismic sequence, Life cost.,
Abstract :
The main objective of this study is to evaluate the effect of seismic sequence on low-cycle fatigue failure in specially optimized steel moment frame connections based on initial construction cost and life cycle cost in the framework of the performance-based design approach. For this purpose, after the performance-based optimal design phase using the center of mass meta-exploration algorithm and considering the objective functions of the initial construction cost and the life cycle cost in the optimization process, in the final phase, low-cycle fatigue evaluation in the joints has been done under seismic sequence. In this research, OpenSees software was used to perform nonlinear modeling and analysis, and Matlab software was used to optimize performance according to FEMA350 regulations. Three steel moment frames of 3, 6, and 12 floors are numerical examples investigated in this study, under 12 accelerograms with seismic sequence and main earthquake, using time history analysis, the fatigue failure index in the joints of these frames has been investigated. According to the results, the structures optimized in the performance-based framework by considering the objective function of the life cycle cost in the optimization process compared to the optimal structures with the objective function of the initial construction cost in 3, 6, and 12-story frames, respectively, lead to a reduction of 8%. 9% and 30%, low-cycle damage index against main earthquakes, and 10%, 13%, and 27% reduction against seismic sequence.
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