Özet:
In this study, a previously-developed reinforced concrete panel (membrane) model formulation is improved by incorporating simple yet e ective constitutive relationships that simulate shear transfer mechanisms across cracks. First, a friction-based shear aggregate interlock mechanism with cyclic degradation parameters is incorporated. Second improvement is the implementation of an origin-oriented dowel action model on reinforcing bars with cyclic degradation parameters. These mechanical enhancements are aimed to achieve better simulation of test results with consideration of physical phenomenon's (e.g. friction along cracks, dowel action, degradation) that are neglected (in full or partially) in the formulations of other panel models available in the literature. Improved model is further validated against test results from two di erent experimental programs. Sensitivity of the improved model to the coe cient of friction is evaluated through computational analyses carried out on ve di erent panel specimens that are identi ed as sensitive to the applied shear transfer mechanisms due to their design or loading characteristics (e.g. asymmetric or inclined reinforcement, complicated loading conditions). Thereafter, using optimal friction coe cients obtained by the parametric sensitivity analysis results, global and local response predictions of the model for ten di erent panel specimens (including specimens used for sensitivity analyses) are compared with test results from two di erent experimental programs for validation of the improved model. Finally, it was observed that the improved panel model provides good correlation with test results as majority of the results are indeed satisfactory.
