Effects of Temporary Support Removal Sequence on the Mechanical Behavior of Composite Beam Bridges With Corrugated Steel Webs in Sustainable Construction

Temporary support technology is used to support and stabilize the bridge structure, bear the bridge construction load, and ensure the stability and safety of the structure in the construction process. Different demolition sequences have a huge impact on the performance of the structure. In order to study the effect of the temporary support removal sequence on the mechanical performance of a composite beam bridge with corrugated steel webs (CSWs) in the construction stage, this article combined with a case study of a composite beam bridge with CSWs in Gansu Province, adopted finite element software to establish a spatial finite element model reflecting the whole construction process of a curved beam bridge with corrugated webs and selected three working conditions for comparative study. The effects of different removal sequences on the variation of vertical deflection, normal stress and shear stress of the section are analyzed. The results show that the section deformation is dominated by vertical flexural deformation, and the removal sequence of temporary supports has a great influence on the formation of the structural stiffness, in which the structural stiffness increase is the largest under operating Condition 3. When the temporary support is removed after the concrete strength of the bridge panel is formed, the vertical deflection of the beam body is the smallest. In addition, the beam section of the center span appears upward deflection. The normal stress value and stress gradient of the center span midspan section are the largest, while the stress gradient of the other sections is the smallest and the stress value is greatly reduced. The shear distribution ratio of each web plate under different operating conditions is basically the same, and the removal sequence of temporary supports has little influence on it. The study underscores the importance of construction sequence optimization for improving efficiency and sustainability in bridge engineering, contributing to the broader adoption of innovative materials and methods in sustainable infrastructure development.