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RISS 인기검색어
- 검색키워드
- 저자 : Dia Eddin Nassani (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Semi-rigidity of cap plate and extended end plate connections
Dia Eddin Nassani,Abdul Hakim Chikho,Alirıza İlker Akgönen 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.23 No.5
The behaviour of steel frames is highly influenced by the beam-column connections. Traditionally, Steel frames were usually designed assuming that connections are ideally pinned or fully rigid. A semi-rigid connection, however, creates a balance between the two extreme approaches mentioned above. In this research, two full scales of Extended End Plate Connections (EEPCs) were tested. Mathematical and numerical models were used to analyse the connections, and close correlations were found between these models and the corresponding tested specimens, which confirmed the confidence in the experimental results. The experimental results obtained enrich the available test data about behaviour of EEPC. In addition, the purpose of studying EEPC experimentally is to compare the stiffness and moment-rotation curve of EEPCs with that of Cap Plate Connections (CPCs), which were tested in a previous work. CPCs have not been studied sufficiently in the literature. The results obtained show that the typical CPC reduces the connection stiffness and these results will make a valuable contribution to the available test data in the research area of CPC.
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A Simple Formula for Estimating the Column Ultimate Load with Effect of Semi-rigid Connections
Dia Eddin Nassani,Abdul Hakim Chikho 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.1
Calculating the ultimate load of a framed column in sway structures involves, in the currently used design method, thecalculation of the column effective length and utilizing the interaction formulae or tables. Therefore no allowance is made forthe presence of semi-rigid connections in the currently used design method. In this paper, a new formula to calculate the columnultimate load is proposed using simple model to simulate the behavior of practical steel columns in sway structures. Thisformula takes into account the effect of semi-rigid connections, the column rotational end restraints and the ratio of the appliedhorizontal to vertical loads. Moreover, the proposed method has the advantage of allowing for the influence of the column endmoments resulted from the presence of the externally applied loads. In order to verify the accuracy of the proposed formula,several examples are presented in which the column ultimate load have been calculated using the proposed formula and thewell known computer program STAAD.Pro. Comparing the obtained results of the proposed method with those obtained fromSTAAD.Pro has shown good correlation and therefore the accuracy of the proposed method to predict the behavior of practicalcolumns has been verified.
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Behaviour of Steel Cap Plate Connections: Experimental Tests
Dia Eddin Nassani 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.3
This paper reports the results of a study conducted to investigate the behaviour of steel cap plate connections. In the analysisand design, connections are characterized as either rigid or pinned and between these two extremities lies the actual behaviourof steel frame connections, which is semi-rigid. This classification is characterized by the nonlinear moment-rotationrelationship which must be incorporated in the analysis. A cap plate connection is widely used in industrial steel frames forits advantages over other types of building connections, but the response of such a connection has not sufficiently beenexperimentally determined. In this research, the behaviour of cap plate connections was studied by testing four full-scaleconnections. Experimental results obtained would add valuable information to the available test data concerning steelconnections since sparse data is available in the literature for this type of connection. Mathematical and numerical models wereused to analyze the cap plate connection and close correlations were found between these models and the experimental results.
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Nonlinear Finite Element Model for the Optimization of Post-Tensioned One-Way Concrete Slab
Abbas H. Mohammed,Dia Eddin Nassani,Nildem Tayşi,Ali K. Hussein 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.7
Optimization in its wide sense can be used to solve many engineering problems and to find the best solutions so that designers cangain a maximum benefit from the available resources. In this research a nonlinear Finite Element (FE) model was developed for theoptimization of Unbonded Post-Tensioned (UPT) one-way slab. ANSYS program was used to find the optimum total weight of Post-Tensioned Tendon (PTT). In the optimization analysis, the objective function is the total weight of PTTs. The area of PTT, tendoninitial stress, and tendon eccentricity are considered as the design variables. Concrete normal stress, steel tendon stress, concrete shearstress, and mid-span deflection of concrete slab are considered as constraints. The optimization result indicates that the total weight ofPTTs can be reduced about 33% for the UPT slabs using an appropriate optimization algorithm.
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