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RISS 인기검색어
- 검색키워드
- 저자 : Mehrshad Amini (검색결과 2 건)
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LES simulations of wind-induced pressure on the floor system underside of elevated buildings
Mehrshad Amini,Ali M. Memari 한국풍공학회 2021 Wind and Structures, An International Journal (WAS Vol.33 No.5
Recent hurricanes have shown that coastal elevated houses are still vulnerable to wind-induced damage, mostly to envelope systems. This paper discusses the performance of elevated houses against hurricane wind loads, particularly wind flow characteristics and the distribution of the peak pressure coefficient (Cp_min) corresponding to the underside of the floor system. Computational fluid dynamics (CFD) analysis was utilized to investigate the effect of interior piers and the wind direction (0 ° ,45° , and 90° ) on the distribution and the magnitude of Cp_min. The CFD results show that the distribution of Cp_min and its maximum value are dependent on pier distribution (e.g., pier location and spacing) and wind direction. The distribution of Cp_min for the 90° wind direction is more similar to the 0 ° wind direction, but the leeward parts of the floor system are exposed to higher negative pressures. The maximum of Cp_min belongs to the 45° wind direction, which occurs at the windward edge and behind the interior pier due to recirculation zones and subsequent vortices. The results of this study indicate that current design standards and provisions need to be updated to include proper design requirements for the floor system, particularly around piers, to help reduce direct/indirect wind-induced damage to elevated houses in coastal areas.
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Incremental dynamic analyses of concrete buildings reinforced with shape memory alloy
Masoud Mirtaheri,Mehrshad Amini,Hossein Khorshidi 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.23 No.1
The use of superelastic shape memory alloys (SMAs) as reinforcements in concrete structures is gradually gaining interest among researchers. Because of different mechanical properties of SMAs compared to the regular steel bars, the use of SMAs as reinforcement in the concrete may change the response of structures under seismic loads. In this study, the effect of SMAs as reinforcement in concrete structures is analytically investigated for 3-, 6- and 8-story reinforced concrete (RC) buildings. For each concrete building, three different reinforcement details are considered: (1) steel reinforcement (Steel) only, (2) SMA bar used in the plastic hinge region of the beams and steel bar in other regions (Steel-SMA), and (3), beams fully reinforced with SMA bar (SMA) and steel bar in other regions. For each case, columns are reinforced with steel bar. Incremental Dynamic Analyses (IDA) are performed using ten different ground motion records to determine the seismic performance of Steel, Steel-SMA and SMA RC buildings. Then fragility curves for each type of RC building by using IDA results for IO, LS and CP performance levels are calculated. Results obtained from the analyses indicate that 3-story frames have approximately the same spectral acceleration corresponding with failure of frames, but in the cases of 6 and 8-story frames, the spectral acceleration is higher in frames equipped with steel reinforcements. Furthermore, the probability of fragility in all frames increases by the building height for all performance levels. Finally, economic evaluation of the three systems are compared.
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