Donglian Tan, Zhao Liu
School of Railway Transportation, Shanghai Institute of Technology, Shang Hai, 201418, China
Abstract: Concrete hollow slab beam bridges are an important part of the highway transportation network. Cracks that occur under long - term loads can alter the stiffness of the beam bridges and affect their structural performance. This paper takes a single 13 - meter simply - supported hollow slab beam as the research object and constructs a finite - element model with a mesh size of 0.1m. The relationships between parameters such as the length, depth, position, and number of load - induced cracks on the bottom slab and the stiffness reduction coefficient μ were studied. The results show that the stiffness reduction coefficient is inversely proportional to the crack length and height. Cracks at the mid - span have a greater impact on μ, and the stiffness loss caused by multiple cracks is similar to the sum of the stiffness losses caused by single cracks. Through the analysis of the normal stress loss at the cracks and combined with relevant theories, a relational expression between the stiffness reduction coefficient and crack characteristics was obtained. After simulation calculations for three types of simply - supported hollow slab beams (8m, 13m, and 16m), the average error between the stiffness reduction coefficient calculated by the formula in this paper and the value calculated by the finite - element method is 1.43%. This provides a valuable reference for the research on the stiffness reduction of concrete beam bridges.
Keywords: Hollow slab girder bridge; Crack parameters; Stiffness reduction coefficient; Finite-element model
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