Frames consisting of composite reinforced concrete and steel (RCS) have been considered as structural systems for several years. This system benefits from the advantages of both systems by optimally combining steel and concrete structural elements. These connections are of two types, which include connections with a through-beam and connections with a through column. In this research, the laboratory model of previous studies has been simulated in ABAQUS finite element software and the seismic performance of RCS joints under cyclic loads and uniform loads was investigated. After validating the finite element model, a parametric study (checking the thickness of the steel panel in the joint area, checking the thickness of the cover sheet, etc.) was performed. Finally, after comparing the results of this type of connection, a modified model was presented which, in addition to increasing the capacity, shows a much more stable and desirable behavior.
The theory of optimization has improved remarkably during the last four decades. The main part of optimizing investigations has been focused on enhancing buckling resistance which does not violate the economic feasibility of final design. The finite element analysis which is called ESO (Evolutionary Structural Optimization) is presented for optimum (or most ideal) design of columns to increase the buckling resistance of structures. To attain the significant design variables, this method can be employed to choose an appropriate, affective and economical way. During an iterative process, the above approach ensures the attainment of global maximum critical load under the imposed equality volume constraint, type of boundary conditions and type of cross sections. Precise results and numerical examples have been shown and useful diagrams have been developed for the cases of simple, clamped and clamped free supported by different types of cross-sectional areas. The model has succeeded in arriving at the global optimal column designs possessing the absolute maximum buckling load without violating the economic feasibility requirement. As a matter of fact, the cross sectional area of column changes whereas, the total volume of column remains constant. As a result, the buckling forces increase. According to this study critical buckling load of columns decreases by changing the boundary condition from clamped to clamped free and then simply supported.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.