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- 저자 : Abdul Hakim Chikho (검색결과 2 건)
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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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