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RISS 인기검색어
- 검색키워드
- 저자 : Fereshteh Emami (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Mitigation of progressive collapse in steel structures using a new passive connection
Masoud Mirtaheri,Fereshteh Emami,Mohammad A. Zoghi,Mojtaba Salkhordeh 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.70 No.4
If an alternative path would not be considered for redistribution of loads, local failure in structures will be followed by a progressive collapse. When a vertical load-bearing element of a steel structure fails, the beams connected to it will lose their support. Accordingly, an increase in span\'s length adds to the internal forces in beams. The mentioned increasing load in beams leads to amplifying the moments there, and likewise in their corresponding connections. Since it is not possible to reinforce all the elements of the structure against this phenomenon, it seems rational to use other technics like specified strengthened connections. In this study, a novel connection is suggested to handle the stated phenomenon which is introduced as a passive connection. This connection enables the structure to tolerate the added loads after failing of the vertical element. To that end, two experimental models were constructed and thereafter tested in half-scale, one-story, double-bay, and bolted connections in three-dimensional spaces. This experimental study has been conducted to compare the ductility and strength of a frame that has ordinary rigid connections with a frame containing a novel passive connection. At last, parametric studies have been implemented to optimize the dimensions of the passive connection. Results show that the load-bearing capacity of the frame increased up to 75 percent. Also, a significant decrease in the displacement of the node wherein the column is removed was observed compared to the ordinary moment resisting frame with the same loads.
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Solar-Assisted Heat Pump Drying of Coriander: An Experimental Investigation
Abbas Alishah,Mohammad Valizadeh Kiamahalleh,Fereshteh Yousefi,Anita Emami,Meisam Valizadeh Kiamahalleh 대한설비공학회 2018 International Journal Of Air-Conditioning and Refr Vol.26 No.4
In this study, the solar-assisted heat pump dryer was designed, manufactured, tested and optimized for drying operations of coriander for its preservation. The heat of drying was mainly provided by a solar collector and a heat pump with two experimental modes of turned on and off. The air temperatures and velocity were identified as the critical drying variables. The responses of the experiments were evaluated in terms of coefficient of performance (COP), energy consumption and the specific moisture extraction rate (SMER). Dehumidification of coriander from the moisture contents of 0.9 to 0.1 kg/kg was considerable. The results demonstrated that utilizing heat pump noticeably decreases the drying time (down to ~25%), energy consumption (down to ~12%) and increases SMER (up to ~ 20%). The increasing of air flow rate and air temperature significantly led to decreasing the drying time and energy consumption, however, increasing the COP and SMER.
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