Based on the mechanical characteristics and calculation theory of composite steel box girder (CSBG) bridge, this paper uses the energy conversion efficiency program of plate element in MIDASFEA finite element software to simulate various configurations and energy conversion efficiency of an open CSBG bridge. The research on the mechanical characteristics and optimization of CSBG bridge design plays a crucial role in enhancing the structural performance, stability, and cost-effectiveness of modern bridge engineering. The primary goal of this study is to investigate the various factors affecting the design and optimization of CSBG bridges, with an emphasis on finite element analysis (FEA) and energy conversion efficiency methods. Through these methodologies, the study aims to provide novel insights that can help in improving the structural integrity of CSBG bridges while also optimizing their cost and performance. Second, the maximum equivalent stress of the diaphragm and longitudinal ribs at the local position of the original bridge (near the support) reaches 170.2 MPa. When the distance between the stiffeners varies between 200 and 800 mm, the mechanical properties of the stiffeners remain basically unchanged. However, both increasing and decreasing the spacing within this range lead to increased structural stress. The temperature fluctuation has a significant effect on the mechanical behavior of both open and closed CSBG bridges but has no effect on the deflection of the structure.
Li et al. (Wed,) studied this question.