Laboratory test results from six different concrete-filled steel-grid bridge deck panels of one and two spans with approximate midspan loadings were compared with finite difference solutions of a governing differential orthotropic plate equation. The orthotropic plate equation was based on assumptions related to fully composite behavior. The effects of changes in properties due to increasing loads were examined. A means of predicting deflections in other laboratory panels was developed, and the results were extended to permit the estimating of deflections in actual bridge decks.

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Modified Donnell equilibrium equations are solved in Part 1 for the case of symmetrical loading and supports, using Fourier series. An evaluation procedure for simple, fixed, and relaxed simple conditions is suggested. In Part 2, an application of the general solution is made for a shell with small circumferential grooves (or ribs) subjected to a longitudinal line load after approximations to allow for such grooves are introduced. The solution is completed for the boundary conditions of classical simple supports and relaxed simple supports and the results compared with experimental data.

In Part 1, modified Donnell equilibrium equations were solved for the case of symmetrical loading and supports using Fourier series. An evaluation procedure for various boundary conditions was suggested. In Part 2, an application of the general solution is made for a shell with small circumferential grooves (or ribs) subjected to a longitudinal line load after approximations to allow for such groves are introduced. The solution is completed for boundary conditions of classical simple supports and relaxed simple supports and the results compared with experimental data.

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