ULTIMATE LOAD ANALYSIS OF PRESTRESSED AND REINFORCED CONCRETE BOX CULVERTS

The effects of compressive membrane forces on the analysis and design of prestressed/reinforced concrete box culverts are considered. Box culvert panels are modeled as one-way slab strips with restrained edges, and the theory of plasticity is applied to find the ultimate load and support reactions for the model. Modified compression field theory is used to relate the sectional forces to internal stress, strain, and angle of diagonal cracks at each specified location and to the total deflection. A direct solution of the equations obtained is not possible. Therefore, numerical methods are used in developing a computer program to perform the calculations. The output results for 16 one-way slab strips are compared with test results. Reasonable agreements are found for load, deflection, and support reactions at the ultimate load conditions. Load enhancement is obtained by considering the ratio of calculated ultimate load to Johansen's load and is found to be between 1.8 and 2.9 for the slabs tested.

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