Shaking table tests and DEM numerical modelling of a 3D-printed groin vault

Preserving monumental historic buildings has not been an easy task due to their high vulnerability to seismic events. Throughout the years, several studies have tried to predict their behavior with the use of different numerical models, but the response is such complex that it remains a challenge. One of the trending tools to simulate masonry is the Discrete Element Model (DEM), but unfortunately few researches have implemented the physical simulation to validate the numerical results, and that is the main motivation of this study, which aims to contribute to the better understanding of masonry structures using a DEM and a physical model of large dimensions. This investigation is part of the “SEBESMOVA3D” project (SEeismic BEhavior of Scaled MOdels of groin VAults made by 3D printers) granted by the Seismology and Earthquake Engineering Research Infrastructure Alliance for Europe SERA. This investigation starts from the design of a 2m x 2m groin vault, which represents a very common typology of ceiling systems in historical masonry monuments. During the first project campaign, the springings are fixed to the base. Each block is formed by a plastic skin (hollow section) and the inner core is filled with mortar to acquire the corresponding mass for dynamic tests. The blocks are easy and fast to assemble, so a significant number of tests can be executed. Prior to the experimental phase, a series of numerical simulations are carried out to predict both static and dynamic behavior based on a defined material characterization, allowing to establish a frequency range to test the physical model. Experimental tests are performed on a 3m x 3m shaking table, and the data obtained from a motion capture system is processed to evaluate displacements and cumulative damage. DEM simulations are run to calibrate and validate the numerical model. The results will be relevant and considered for the next project campaign.