الفهرس 
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Abstract
In recent years, the reduction of cost has been a very necessary parameter that every designer should be aware of. Hollow steel sections (HSS) provide reduced weight and surface area when compared to equivalent open sections. Hollow steel sections (HSS) also provide a much lower slenderness ratio for the same effective length, and hence a higher compression capacity. This opened the gates to new design access, which is the concrete-filled steel tube (CFST). Further studies have resulted in improvements in the design standard of hollow steel sections and the concrete quality has been greatly improved. However, the steel section type, grade, and manufacturing and concrete characteristic cylinder strength together control the overall section capacity. Concrete filled steel tubes (CFST) combine the advantages of ductility associated with Steel structures, with the stiffness of a concrete structural system. This paper aims to study the behavior of rigid connection between steel I-beam and hollow square section, by utilizing a different approach. The blind bolt approach appeared progressively in scientific research and the construction field during the last decade. Codes and design guides don’t give full design practice in this connection, which is a motivation for this research to be conducted. An extensive parametric study will be conducted to investigate the influence of various parameters on the connection performance.
In this research, a comprehensive parametric numerical analysis is performed using the Finite Element Method (FEM). The study covered several different types of moment connections by varying their defining elements’ thicknesses. The effect of several factors related to the joint components is also studied to identify the sensitivity of the generated moment rotation to these parameters.
The main outcome of this research is a set of design charts and equations relating the different investigated parameters to the flushed endplate moment connection using blind bolts. The developed charts are intended to help the designer accurately model such connections in FEM programs with their actual rotational stiffness. This helps to predict the actual behavior of the structure to accurately check serviceability limit states such as deflections and drifts under lateral load actions. Moreover, several interesting conclusions, observations, and recommendations are given.