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The goal of this study is to look into a new low-cost connection that can be readily established on the site. Similarly, to improve the efficiency of the connections and investigate the various variables that influence their capacity. Several studies focused on the behavior of these connections under various types of loads, which led to the discovery of their weak points, the ideal strength method for these connections under various loads, the best method of erection, as well as the cost and the time of construction. In the research's experimental part, a vertical force was applied to three types of connections between a circular column and end-plate. The connection was strengthened by filling the column with concrete and welding two circular bars in the tension and compression zones. The tested connections were analyzed using a computer program in the numerical analysis section (ANSYS 16). Finite element results were validated with experimental results. The parametric study of six extended end-plate connections separated into two groups under the effect of shearing force. The use of two internal circular bars at the tension and compression zones and the filling of the column with concrete are the main parameters that are considered in the study.

The current study presents lateral load analysis of mid-rise reinforced concrete framed structures with two different lateral load resisting systems; shear walls and rigid marginal beams. The main objective here is to investigate the influence of the location of the system in the structure; i.e. arrangement of shear walls and level of the marginal beam. For that purpose, seismic fragility curves are used as an assessment tool for comparing the seismic performance of the studied structures in different situations. Incremental dynamic analysis was performed under ten ground motions to determine the yielding and collapse capacity of each building. Five performance levels were considered in the analysis. These performance levels are (i) operational, (ii) immediate occupancy, (iii) damage control, (iv) life safety and (v) collapse prevention. Fragility curves were developed for the structural models of the studied structures considering the previously mentioned performance levels. It was observed that arrangement of shear walls on the long direction of the structure has insignificant effects on its performance while interior shear walls provide the best behavior of the structure compared to exterior shear walls only and distributing shear walls internally and externally. The analysis outcomes also indicated that the presence of the rigid marginal beam in the lower storey gives more efficiency regarding to lateral loads resistance in the studied structure.

The purpose of this paper is introducing a simplified and computationally efficient finite element model to investigate the nonlinear behavior of composite and non-composite space trusses. Two models were employed using the Finite Element ANSYS program in order to analyze the space trusses. The first model simulates the non-composite space trusses while the second model simulates the composite space trusses. Also this research presents the comparisons between the results of the current finite element models and four previous published space trusses in order to verify the validity of the current models. Comparisons between the results of the two models and the results of the four previous published space trusses indicated that the numerical analysis created by the FE ANSYS program using the two employed models can predict the general collapse behavior of the space trusses.

Multi-Cell Steel Column (MCC) presents an innovative solution for the problem of local buckling in thin walls of steel column of box section type. This study presents an extension for this innovative solution by filling the column cells with normal concrete capable of enhancing the axial load capacity of such columns. A group of eight MCSC specimens of square cross-section were experimentally tested by applying axial compression load which included hollow and those filled with concrete. In addition, numerical analysis was carried out using ABAQUS, Finite Element (FE) software, in order to validate the experimental results. A parametric study was conducted in this investigation to include more parameters such as number of internal cells wall external to internal wall thickness. Numerical results showed a good agreement with the experimental results. Both experimental and numerical results showed great enhancement in the load carrying capacity of composite (MCC) compared to non-composite ones that ranged between 690% and 800%. In addition, there was an increase between (MCC) and Single Cell Steel Column (SCC) that ranged between 18% to 27% increase of. A remarkable improvement in the ductility behaviour was also observed during the study.