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RISS 인기검색어
- 검색키워드
- 저자 : Kamalzare, Mehrad (검색결과 3 건)
- 무료
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Efficient optimal design of passive structural control applied to isolator design
Kamalzare, Mahmoud,Johnson, Erik A.,Wojtkiewicz, Steven F. Techno-Press 2015 Smart Structures and Systems, An International Jou Vol.15 No.3
Typical base isolated buildings are designed so that the superstructure remains elastic in design-level earthquakes, though the isolation layer is often quite nonlinear using, e.g., hysteretic elements such as lead-rubber bearings and friction pendulum bearings. Similarly, other well-performing structural control systems keep the structure within the linear range except during the most extreme of excitations. Design optimization of these isolators or other structural control systems requires computationally-expensive response simulations of the (mostly or fully) linear structural system with the nonlinear structural control devices. Standard nonlinear structural analysis algorithms ignore the localized nature of these nonlinearities when computing responses. This paper proposes an approach for the computationally-efficient optimal design of passive isolators by extending a methodology previously developed by the authors for accelerating the response calculation of mostly linear systems with local features (linear or nonlinear, deterministic or random). The methodology is explained and applied to a numerical example of a base isolated building with a hysteretic isolation layer. The computational efficiency of the proposed approach is shown to be significant for this simple problem, and is expected to be even more dramatic for more complex systems.
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Efficient optimal design of passive structural control applied to isolator design
Mahmoud Kamalzare,Erik A. Johnson,Steven F. Wojtkiewicz 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.15 No.3
Typical base isolated buildings are designed so that the superstructure remains elastic in design-levelearthquakes, though the isolation layer is often quite nonlinear using, e.g., hysteretic elements such as lead-rubberbearings and friction pendulum bearings. Similarly, other well-performing structural control systems keep thestructure within the linear range except during the most extreme of excitations. Design optimization of these isolatorsor other structural control systems requires computationally-expensive response simulations of the (mostly or fully)linear structural system with the nonlinear structural control devices. Standard nonlinear structural analysis algorithmsignore the localized nature of these nonlinearities when computing responses. This paper proposes an approach forthe computationally-efficient optimal design of passive isolators by extending a methodology previously developedby the authors for accelerating the response calculation of mostly linear systems with local features (linear ornonlinear, deterministic or random). The methodology is explained and applied to a numerical example of a baseisolated building with a hysteretic isolation layer. The computational efficiency of the proposed approach is shown tobe significant for this simple problem, and is expected to be even more dramatic for more complex systems.
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Seismic response of geosynthetic reinforced retaining walls
Jesmani, Mehrab,Kamalzare, Mehrad,Sarbandi, Babak Bahrami Techno-Press 2016 Geomechanics & engineering Vol.10 No.5
The effects of reinforcement on the horizontal and vertical deformations of geosynthetic reinforced retaining walls are investigated under a well-known seismic load (San Jose earthquake, 1955). Retaining walls are designed with internal and external stability (with appropriate factor of safety) and deformation is chosen as the main parameter for describing the wall behavior under seismic load. Retaining walls with various heights (6, 8, 10, 12 and 14 meter) are optimized for geosynthetics arrangement, and modeled with a finite element method. The stress-strain behavior of the walls under a well-known loading type, which has been used by many previous researchers, is investigated. A comparison is made between the reinforced and non-reinforced systems to evaluate the effect of reinforcement on decreasing the deformation of the retaining walls. The results show that the reinforcement system significantly controls the deformation of the top and middle of the retaining walls, which are the critical points under dynamic loading. It is shown that the optimized reinforcement system in retaining walls under the studied seismic loading could decrease horizontal and vertical deformation up to 90% and 40% respectively.
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