Sep 2026· Advances in Science and Technology Research Journal· 0 citations· 21 references
Abstract
The study presents the results of model experimental investigations and nonlinear numerical analyses of thin-walled, two-segment box structures with various configurations of integral corrugated stiffeners. The models for experimental testing were fabricated using additive manufacturing techniques. Five variants of the structure were examined, including a reference configuration without reinforcement. The experimental investigation was carried out using a dedicated test rig. Numerical representations of the investigated models were developed and subjected to nonlinear analyses using finite element method-based software. The adequacy of the numerical results was assessed through comparison with experimental data. The objective of the study was to determine the effect of different forms of the proposed structural solution on the magnitude of the critical load and the nature of post-buckling deformation.
This study aims to experimentally investigate the buckling behavior and load-bearing capacities of cold-formed steel (CFS) omega-section columns under axial load. Within the scope of the research, 11 omega column specimens with thicknesses ranging from 1.75 mm to 3 mm were integrated with corrugated silo wall sheets of various thicknesses and subjected to axial compression tests. The experiments were designed to analyze the effects of lateral restraint conditions and column thickness on load-bearing capacity, post-elastic behavior, and failure modes. The findings fill a significant gap in literature by demonstrating the interactive performance of omega sections with secondary elements like silo walls. This study provides critical data for the design of these thin-walled members in modern construction applications.
Ramazan Oruç, Yakup Bölükbaş, M. E. Kara· Ömer Halisdemir Üniversitesi...· 0 citations
In modern design practice, a numerical method for verifying the robustness of damaged structural systems based on imitation modeling is becoming increasingly common. This method utilizes the fundamental principles of macromodeling, according to which the elastic behavior of a structural system is determined by the operation of linearly elastic rods and plates, while nonlinear behavior is completely determined by the behavior of point and/or linear plastic hinges. Thus, an adequate description of the diagrams for plastic hinges is an important element of modeling. This article presents proposals for describing the parametric points of plastic hinges for bending, shear, and axial tension, which allows for describing the operation of a damaged structural system at all stages of its operation. It is proposed to limit the maximum rotation angles during bending, taking into account the shear failure criterion. The calculation results obtained using an imitation finite element model are compared with experimental data.
The presence of openings in reinforced concrete (RC) walls leads to a marked reduction in both axial load capacity and overall stiffness, thereby compromising structural performance. To mitigate these adverse effects and maintain safety, various strengthening methods have demonstrated effectiveness in restoring and enhancing the structural capacity of RC walls containing openings. In the present study, a finite element modeling strategy is proposed and verified against two experimental investigations available in the literature. The comparison reveals strong correlation between the numerical simulations and the experimental findings, confirming the reliability of the modeling approach. Building on this validation, an extensive parametric analysis is performed. The outcomes of this study are then employed to formulate an empirical design expression that incorporates the primary governing parameters for predicting the axial load capacity of one-way RC walls with a single rectangular or square opening retrofitted using externally bonded (EB) CFRP sheets.
Youssef Elmezayen, A. Morsy, Nabil H. El-Ashkar· 0 citations
Objective
. This work is devoted to a quantitative assessment of the effect of internal prestressing of reinforcement on the stress-strain state and load-bearing capacity of a thick-walled cylindrical shell.
Method
. The study is carried out through a computational experiment using the finite element method in an axisymmetric formulation. The physical nonlinearity of concrete is described by the Sargin diagram, the parameters of which are verified according to Eurocode 2 data.
Result
. An iterative algorithm based on the method of variable elasticity has been developed for correcting the secant modulus of concrete deformations. The reinforcement is modeled discretely, and the prestressing effect is specified as initial stresses in the reinforcement elements. The modeling results showed that for a cylinder made of B40 concrete with a reinforcement percentage of 3.11%, failure under internal pressure is of a deformation nature and is associated with reaching ultimate tensile strains in the concrete, rather than with the exhaustion of compressive strength. The ultimate internal pressure for a non-stressed structure is 0.55 MPa. A hoop prestressing threshold of 265 MPa has been determined. Exceeding this threshold causes unacceptable tensile stresses in concrete even before the initial operational phase. It has been shown that the optimal hoop prestressing level of 250 MPa allows for doubling the ultimate internal pressure to 1.1 MPa.
Conclusion
. The developed numerical model and calculation algorithm enable predicting the behavior of reinforced concrete structures, taking into account the actual properties of materials and process factors. The obtained results demonstrate the high effectiveness of prestressing for thick-walled cylinders and highlight the need to control not only the strength but also the deformation criteria of concrete failure.
V. V. Kuznetsov, S. V. Litvinov, T. Volosatova· Herald of Dagestan State Tec...· 0 citations
This study presents the development of a three-dimensional finite element model for simulating the fire behavior of prestressed glued-laminated timber. The finite element model, based on experimental data and the recommendations of Eurocode 5, accounts for the temperature-dependent evolution of the wood’s physical and mechanical properties. It enables a realistic prediction of the residual load-bearing capacity and post-fire structural behavior of timber beams following fire exposure and cooling to ambient temperature and has been validated through simulations of full-scale fire tests reported in the literature. Despite advances in numerical modeling, the fire behavior of such structures has been subject to only limited numerical investigations, with most studies being experimental or analytical. In this context, the proposed model provides a robust numerical tool capable of accurately analyzing fire performance and identifying char formation zones. The calculated temperature profile at the fire-exposed surface closely matches experimental results, and the temperature trends at different beam depths show only minor deviations from measurements. Furthermore, the maximum deviation between the predicted and measured char layer thickness after 60 min of fire exposure is approximately 4.4%, demonstrating the model’s accuracy in reproducing thermomechanical transfers within wood under higher temperatures. These results confirm that the model can reliably predict both the temperature distribution and char formation in prestressed glued-laminated timber beams during fire exposure.
M. Khelifa, D. Fakra, Cai Chen· Journal of fire sciences· 0 citations
ABSTRACT This paper experimentally investigates the prestressing effect of repeated strip footing loading on scaled reinforced earth walls and compares the results with numerical, analytical, and particle image velocimetry (PIV) analyses. Two wall configurations with full-height rigid and flexible facings and three reinforcement types were examined to evaluate soil–reinforcement interaction under repeated loading. Maximum reinforcement tensile forces and wall deflections were compared during the initial loading and subsequent reloading stages. Under the same footing load, wall deflection and footing settlement during reloading were approximately 50% lower than those measured during the initial loading stage. This improvement is attributed to a prestressing effect developed in the reinforcement, particularly near the wall facing. Numerical and analytical predictions showed good agreement with the experimental measurements of tensile forces and wall deformations. Larger discrepancies were observed for non-woven geotextile reinforcement because of its nonlinear response, which was further investigated using PIV analysis.
H. Ahmadi, Adam Bezuijen· International Journal of Geo...· 0 citations
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