A band domain method for controlling numerical simulations of URM structures across modeling approaches

In this work, a band domain method at the pier scale is proposed for enhancing awareness on results. The method considers consolidated capacity models that assume the pier (or spandrel) lateral response as dependent on few mechanical properties of masonry, applied axial load, element geometry and boundary conditions. Therefore, the method application requires engineering judgment and software results. Software specificness epistemic uncertainty in evaluating the pier axial load is also considered. Using this method, users can check whether the pier lateral response predicted from a given modeling approach is similar or not to the capacity model response. To exemplify the method, two benchmark unreinforced masonry walls were evaluated using pushover analysis of finite element (FE) and equivalent frame (EF) models. Predictions are consistent between the two models in terms of damage patterns. For the comparison of pushover response parameters, especially for base shear coefficient and displacement capacity, differences between FE and EF predictions were addressed by applying the band domain method to different piers. This method revealed a discordant simulation of the squat pier response between the two models, which stress state was investigated. Moreover, the influence of crack orientation in the FE material model was evaluated by considering a second squat pier. No conclusive judgments were drawn on which response is more representative of the experimental one due to the lack of squat pier tests. However, the investigation allows a relevant insight into the role of horizontal compressive stresses in the pier behavior.