Document Type : Original Article
Authors
1
Department of Civil Engineering, Zagazig University of Engineering , Egypt
2
Professor Structural Eng. Dept., Faculty of Eng., Zagazig University, Zagazig, Egypt.
3
Civil Engineering Department, High Institute for Engineering and Technology at Al - Obour (K21 Cairo /Bilbies Road),Higher Education Ministry,Cairo,Egypt.
Abstract
This study addresses the challenge of mitigating significant deflection in wide beams, resulting from their weak inertia in the load direction. Identifying deficiencies in both numerical and experimental methodologies, the research employs a parametric study to optimize enhancement techniques. The primary objective is a nuanced investigation into the impact of welded stirrups on the structural behavior of wide shallow beams, considering variations in stirrup spacing, stirrups welding, stirrup diameter, and compression steel ratio in comparison to tension reinforcement.
The research encompasses 10 specimens representing four enhancement factors, including three tested experimentally and seven through ANSYS models. One specimen undergoes both experimental and numerical representation for verification. The verification analysis, crucial for the intricate representation of welding in simulations, precedes a comprehensive comparison between experimental and numerical results, facilitating a holistic parametric study. The intricate representation of welding in ANSYS poses challenges due to the geometric, material, and thermal complexities associated with welding processes. Accurate modeling requires addressing nonlinear behavior, capturing residual stresses, and navigating multi-physics interactions, constituting a crucial yet intricate aspect in structural analysis.
All tested beams share identical dimensions: a clear span of 1800mm, width of 500mm, and thickness of 200mm. Experimental findings reveal a substantial enhancement in the load capacity of hidden beams, ranging from 54% to 62% when utilizing welded stirrups. Further analysis indicates that reducing stirrup spacing, diameter, and increasing compression steel ratio increases load capacity by 25.90%, 31.60%, and 49.19%, respectively.
The study extends its scrutiny to a comparison with international codes (ECP-203-2020, EN 1992, CSA2004, and ACI 318-14). The ratio between experimental shear force and calculated values from these codes varies from 0.85 to 3.79, providing crucial insights into the alignment or deviation of experimental results from global standards. This systematic exploration contributes valuable knowledge to the understanding and optimization of hidden beam performance.
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