- document
-
Korswagen, Paul A. (author), Longo, M. (author), Meulman, E. (author), Rots, J.G. (author)In recent years, gas extraction in the northern part of the Netherlands has been causing low-magnitude, induced, shallow earthquakes. Besides safety, the prediction and evaluation of ‘light’ damage due to these induced ground motions is important, as it is related to economic and serviceability losses, and societal unrest. An experimental and...journal article 2019
- document
-
Jafari, S. (author), Rots, J.G. (author), Esposito, R. (author)This study investigates the applicability of the core testing method to assess the complete nonlinear behavior of masonry in compression. A comparative experimental approach was adopted performing compressive tests on cores and companion wallets. Via a correlation study on seven objects, including literature data, a one-to-one correlation for...journal article 2019
- document
-
Pari, M. (author), Hendriks, M.A.N. (author), Rots, J.G. (author)Sequentially linear analysis (SLA), a non-incremental-iterative approach towards finite element simulation of quasi-brittle materials, is based on sequentially identifying a critical integration point in the model, to reduce its strength and stiffness, and the associated critical load multiplier (λ <sub>crit</sub> ), to scale the linear...journal article 2019
- document
-
Pari, M. (author), Swart, W. (author), van Gijzen, M.B. (author), Hendriks, M.A.N. (author), Rots, J.G. (author)Sequentially linear analysis (SLA), an event-by-event procedure for finite element (FE) simulation of quasi-brittle materials, is based on sequentially identifying a critical integration point in the FE model, to reduce its strength and stiffness, and the corresponding critical load multiplier (λ <sub>crit</sub>), to scale the linear analysis...journal article 2019
- document
-
D'Altri, Antonio Maria (author), Messali, F. (author), Rots, J.G. (author), Castellazzi, Giovanni (author), de Miranda, Stefano (author)In this paper, a damaging block-based model is proposed for the numerical analysis of the cyclic behaviour of full-scale masonry structures. Solid 3D finite elements governed by a plastic-damage constitutive law in tension and compression are used to model the blocks, while a cohesive-frictional contact-based formulation is developed to simulate...journal article 2019
- document
-
Esposito, R. (author), Messali, F. (author), Ravenshorst, G.J.P. (author), Schipper, H.R. (author), Rots, J.G. (author)The exploitation of geo-resources in the northern part of the Netherlands (Groningen region) is triggering shallow earthquakes, rising the need of assessing the current building stock. Being the region not prone to tectonic earthquakes, buildings are designed as wind-resistant systems and have specific characteristics that can limit their...journal article 2019
- document
-
Messali, F. (author), Rots, J.G. (author)In recent years, seismic assessment of existing unreinforced masonry (URM) structures is being increasingly based on nonlinear methods. The in-plane displacement capacity represents one of the most crucial yet still debated features of the nonlinear behaviour of URM piers. International codes often employ empirical models to estimate the pier...journal article 2018
- document
-
Damiola, M. (author), Esposito, R. (author), Messali, F. (author), Rots, J.G. (author)Out-of-plane failure is one of the most important mechanisms for unreinforced ma-sonry (URM) structures to be prevented in the seismic areas. The one-way out-of-plane bend-ing failure mechanism has been studied by several authors. The two-way bending failure mechanism has received much less attention and only few formulations for specific cases...conference paper 2018
- document
-
Ferretti, F. (author), Mazzotti, C. (author), Esposito, R. (author), Rots, J.G. (author)Masonry is a composite material, whose behavior is strongly influenced by the presence of vertical and horizontal mortar joints, weak elements along which the shear failure usually occurs. The scope of the present work was to investigate factors that could affect the shear-sliding behavior of masonry, by performing numerical simulations of...conference paper 2018
- document
-
Jafari, S. (author), Esposito, R. (author), Rots, J.G. (author)To accurately assess the performance of existing unreinforced masonry (URM) structures, the mechanical characteristics of masonry under compressive loading are required. The compression properties of existing URM can be evaluated through different methods, either performing destructive tests (DTs) or slightly destructive tests (SDTs). DTs can be...conference paper 2018
- document
-
Messali, F. (author), Pari, M. (author), Esposito, R. (author), Rots, J.G. (author), den Hertog, D (author)In recent years induced seismicity in the north of the Netherlands has considerably increased. The built environment in the region mainly consists of unreinforced masonry (URM) buildings. Those buildings were not designed for seismic loads and have specific characteristics, that limit their seismic performance. In early 2017 a quasi-static...conference paper 2018
- document
-
Skroumpelou, Georgia (author), Messali, F. (author), Esposito, R. (author), Rots, J.G. (author)The assessment of the seismic response of unreinforced masonry (URM) buildings has been a popular topic all over the world in the last decades. In recent years, induced seismicity in the north of the Netherlands increased considerably and introduced seismic risk also in this country. The built environment in the region is mainly composed by...conference paper 2018
- document
-
Esposito, R. (author), Jafari, S. (author), Ravenshorst, G.J.P. (author), Schipper, H.R. (author), Rots, J.G. (author)In recent years induced seismicity in the Netherlands considerably increased. This phenomenon has a wide impact on the built environment, which is mainly composed by unreinforced masonry (URM) structures. These buildings were not designed for seismic loading, and present peculiar characteristics include very slender walls (100 mm thickness and 2...conference paper 2018
- document
-
Messali, F. (author), Esposito, R. (author), Jafari, S. (author), Ravenshorst, G.J.P. (author), Korswagen, Paul A. (author), Rots, J.G. (author)In recent years, induced seismicity in the north of the Netherlands significantly increased. As a consequence, the seismic assessment of the built environment, which mainly consists of unreinforced masonry (URM) structures not designed for seismic loads, became of high relevance. Within this context, an extensive multiscale testing program has...conference paper 2018
- document
-
Yu, C. (author), Hoogenboom, P.C.J. (author), Rots, J.G. (author)Quasi brittle materials, such as un-reinforced masonry or concrete are difficult to analyse because often the traditional Newton–Raphson (N-R) procedure fails to converge. Many solutions have been proposed such as Sequentially Linear Analysis (SLA), but these may fail in case of non-proportional loading with a large prestress. In this paper a...journal article 2018
- document
-
Pari, M. (author), Rots, J.G. (author), Hendriks, M.A.N. (author)This article presents a new non-proportional loading strategy for Sequentially Linear Analysis (SLA), which is a robust secant stiffness based procedure for nonlinear finite element analysis of quasi-brittle materials, like concrete and masonry. The strategy is based on finding the principal planes for a total strain based fixed cracking model,...conference paper 2018
- document
-
Messali, F. (author), Ravenshorst, G.J.P. (author), Esposito, R. (author), Rots, J.G. (author)The evaluation of the seismic response of unreinforced masonry buildings is a popular topic all over the world. In recent years, also the Netherlands started to face seismic risk, since the induced seismicity in the north of the country considerably increased (the gas extraction started in 1963, and earthquakes have occurred since the early ‘90s...conference paper 2017
- document
-
Jafari, S. (author), Esposito, R. (author), Rots, J.G. (author)Starting point in this research is to find a quick and non-destructive method to characterize the mechanical properties of existing masonry. Tests on cylindrical cores have been recently introduced as a novel in-situ testing method to identify the properties of existing clay brick masonry. Currently, some researchers reported promising results,...conference paper 2017
- document
-
Pari, M. (author), Jafari, S. (author), Messali, F. (author), Esposito, R. (author), Rots, J.G. (author)Induced seismicity in the Groningen region of the Netherlands has led to a large scale testing campaign on Calcium silicate element masonry structures at Delft University of Technology. An overview of the finite element analysis (FEA) using an implicit solver, on the full scale quasi-static cyclic pushover test performed on a two-storey calcium...conference paper 2017
- document
-
Cyclic pushover test on an unreinforced masonry structure reseambling a typical Dutch terraced houseEsposito, R. (author), Terwel, K.C. (author), Ravenshorst, G.J.P. (author), Schipper, H.R. (author), Messali, F. (author), Rots, J.G. (author)During the last years, induced seismicity in the northern part of the Netherlands increased and the seismic assessment of unreinforced masonry (URM) structures became an important issue. As the problem is recent, the current building stock is not designed to withstand earthquakes and national guidelines are under development, but currently not...conference paper 2017