Analysis of Steel Frame Bridge Construction

Abstract

The construction of steel frame bridges—such as truss and girder systems—is a complex engineering undertaking that demands precise planning and execution to ensure safety and efficiency. This research presents a comprehensive analysis of the construction process for a representative steel frame bridge. The objective is to evaluate the selected construction methodology, its impact on the project schedule, and the critical aspect of structural stability during the erection phases. This study employs a case study methodology, deconstructing the project into key sequential stages: substructure interfacing, member fabrication, modular pre-assembly, and the final erection sequence (e.g., segmental lifting by crane or incremental launching). A core component of this analysis involves phased structural modeling to simulate stresses, deflections, and connection integrity at each temporary stage. This ensures the frame's stability against construction loads (such as equipment, wind, and self-weight) before the structure becomes self-supporting. The analysis identifies critical path activities, logistical challenges, and the significant impact of connection detailing on assembly speed. This study concludes that a successful steel frame bridge project is contingent not only on the final permanent design but on a robust, pre-emptive analysis of the construction sequence and all associated temporary works.