Investigation of Structural Behavior and Computational Modeling of a Transformable Guiding Bridge

This paper investigates the structural behavior and computational modeling of a transformable guiding bridge system intended for rapid deployment in extreme operational conditions. The performance of temporary guiding bridges is governed not only by their structural configuration but also by the accurate evaluation of internal forces and deformations arising during both installation and service stages, which is particularly critical for emergency, rescue, and military engineering applications. The distinguishing feature of the proposed bridge system lies in its transformable structural behavior. During the installation phase, the bridge functions as a temporary multi-span structure supported by deployable auxiliary supports, whereas during service it is converted into a single-span system. This transformation leads to a significant redistribution of internal forces and necessitates a computational approach capable of capturing both structural states. A realistic calculation model was developed to represent the actual behavior of the bridge, incorporating modular geometry, temporary transformable supports, and appropriate boundary conditions. Structural analysis was carried out using MIDAS Civil 2024 software, based on the displacement-based finite element method. The model considers permanent, live, and temporary installation-related loads corresponding to unfavorable working conditions. The results demonstrate that maximum bending moments, shear forces, and deflections occur during the installation stage but remain within allowable normative limits. The study confirms that the application of transformable temporary supports significantly improves structural safety and constructability. The proposed guiding bridge system provides a reliable and efficient solution for rapidly deployable transport infrastructure in extreme environments.