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RISS 인기검색어
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- 저자 : Farshid Fathi (검색결과 3 건)
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Hybrid Coupled Building Control for Similar Adjacent Buildings
Farshid Fathi,Omid Bahar 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.1
The concept of connecting two adjacent buildings has been effectively used to mitigate the structural responses of such buildings due to strong ground motions. Lots of analytical and experimental studies have shown the efficiency of this conventional strategy for dissimilar coupled buildings. However, it is absolutely inefficient for the similar connected buildings. The authors, in their previous works, have provided a new Hybrid Coupled Building Control method (HCBC method) which is applicable to all adjacent buildings. This control strategy reduces the structural responses, and thus reduces the internal forces, of the connected buildings more efficiently than the conventional Coupled Building Control method. In order to apply this strategy, one of the buildings is equipped with a base isolation system, and an active actuator link connects the upper floor of the shorter building to its corresponding floor of the other building. In this paper, the HCBC method is developed for the similar coupled buildings. Herein, this structural control method is applied to two similar connected moment-resisting frame buildings. The best performance of the system is obtained, by designing the control system, so that the two connected buildings stay within their elastic range due to the ground motions. The performances of the HCBC models using active and passive strategies are also compared in details.
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Babak Behforouz,Parham Memarzadeh,Mohammadreza Eftekhar,Farshid Fathi 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.25 No.2
There is a growing interest in the use of by-product materials such as ceramics as alternative materials in construction. The aim of this study is to investigate the mechanical properties and durability of sustainable concrete containing waste ceramic powder (WCP), and to predict the results using artificial neural network (ANN). In this order, different water to binder (W/B) ratios of 0.3, 0.4, and 0.5 were considered, and in each W/B ratio, a percentage of cement (between 5-50%) was replaced with WCP. Compressive and tensile strengths, water absorption, electrical resistivity and rapid chloride permeability (RCP) of the concrete specimens having WCP were evaluated by related experimental tests. The results showed that by replacing 20% of the cement by WCP, the concrete achieves compressive and tensile strengths, more than 95% of those of the control concrete, in the long term. This percentage increases with decreasing W/B ratio. In general, by increasing the percentage of WCP replacement, all durability parameters are significantly improved. In order to validate and suggest a suitable tool for predicting the characteristics of the concrete, ANN model along with various multivariate regression methods were applied. The comparison of the proposed ANN with the regression methods indicates good accuracy of the developed ANN in predicting the mechanical properties and durability of this type of concrete. According to the results, the accuracy of ANN model for estimating the durability parameters did not significantly follow the number of hidden nodes.
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Amir Tabebordbar,Seyed Mehdi Dehghan,Farshid Fathi,Mohammad Amir Najafgholipour 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.5
Built-up Double-I (BD-I) columns have been commonly used for mid-rise steel-frame structures in Iran. These columns consist of two hot rolled IPE sections which are connected by two cover plates and fillet welds. Until 2017, BD-I columns were employed in intermediate moment resisting frames (MRF) using welded flange plate (WFP) connections. To evaluate the seismic behavior of the connections, four samples were made and tested based on cyclic loading according to AISC 341-16. It was concluded that typical samples cannot satisfy the seismic provisions related to intermediate MRFs. In contrast, the proposed connections retrofitted with two-part external diaphragms were able to satisfy not only the seismic requirements related to intermediate MRFs but also those related to special MRFs according to AISC. The numerical modeling of these samples was performed using ABAQUS finite element software. This study compared the hysteresis moment-rotation curves, plastic strains, and behavior modes in both experimental samples and numerical models.
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