Multi-objective stochastic-structural-optimization of shape-memory-alloy assisted pure-friction bearing for isolating building against random earthquakes |
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| Institution: | 1. Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II (SA), Italy;2. Universidad de Buenos Aires. Consejo Nacional de lnvestigaciones Científicas y Técnicas (CONICET). Instituto de Tecnologías y Ciencias de la Ingeniería “Hilario Fernández Long” (INTECIN). Facultad de Ingeniería, Buenos Aires, Argentina;1. Department of Civil Engineering, Faculty of Engineering, University of Qom, Qom, Iran;2. School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran;1. Department of Structural, Geotechnical and Building Engineering (DISEG), Politecnico di Torino, Turin, Italy;2. Universidad de Buenos Aires. Consejo Nacional de lnvestigaciones Científicas y Técnicas (CONICET). Instituto de Tecnologías y Ciencias de la Ingeniería “Hilario Fernández Long” (INTECIN). Facultad de Ingeniería, Buenos Aires, Argentina;3. Department of Civil Engineering, University of Salerno, Fisciano, SA, Italy;1. Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China;2. Shanghai Key Lab of Intelligent Information Processing, School of Computer Science, Fudan University, Shanghai 200433, China;3. College of Civil Engineering, Yantai University, Yantai 264005, China;1. Department of Geotechnical Engineering, Tongji Univers1ity, Shanghai, 200092, China;2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Shanghai, 200092, China |
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| Abstract: | The optimal stochastic performance of pure friction system supplemented with SMA-restrainer (SMA-PF) is presented based on a framework of multi-objective optimization. The evaluation of system response for this is based on nonlinear random vibration analysis. The optimizing design variables are based on two mutually conflicting objectives, involving maximizing the isolation efficiency as well as isolator displacement. The proposed optimal design, thus, not only maximizes the isolation efficiency but also impose due consideration to the bearing displacement. The optimal bearing is shown to substantially reduce the bearing displacement with nominal sacrifice in isolation efficiency. Comparison of the multi-objective Pareto fronts reveals much facilitated trade-off among the mutually conflicting objectives in SMA-PF than in PF system. The viability of the optimal performance is further verified under recorded ground motions, which is observed to be in parity to the stochastic response behavior. The reduction in the residual bearing displacement is also observed. |
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| Keywords: | Shape memory alloy Base isolation Stochastic Earthquake Optimization |
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