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Volume Title: ICASGE2023

DOI: ICASGE-STA

¹mohamed ali elsayed ; ²Mohamed Sakr; ³tarek mohamdy khalifa; mohamed ali elsayed

¹structural engineering, faculty of engineering, Tanta university, Tanta, Egypt

²Structural Analysis, Faculty of Engineering, Tanta University, Tanta, Egypt

³structural engineering, faculty of engineering, Tanta university, Tanta

This paper presents a finite element (FE) model of a new configuration of rebar truss stiffened cold-formed U-shaped steel-concrete composite beams (RCUCB), of which the upper opening part of the steel U-section is connected by a rebar truss so that the torsional stability can be enhanced. In this study, three-dimensional (3D) finite FE model is developed to investigate the flexural behaviour of RCUCB under flexure. The FEM is validated against experimental results from the literature. It is proved that the FEM can predict the peak loads and modes of failure accurately. The FE load-deflection curve agreed well with the experimental results. The validated FE model is adopted to show the effectiveness of the inverted U-shaped reinforcement (IUR) when installed to RCUCB. The IUR was observed to keep the integral action between concrete slab and lower part (including steel U-section, encased concrete, and reinforcement) and improve the bending capacity and ductility of a RCUCB. Furthermore, the parametric study extended to include the effect of bottom longitudinal reinforcement ratio and the effective width of slab. Results show that the tensile longitudinal reinforcement plays a major role in controlling the cracks and deformations of encased concrete, increase the bending capacity and reduce the slip between steel and concrete

Finite element model; composite beam; Rebar truss; Encased concrete; RCUCB

Structural Analysis (STA)