Simulation of the in-plane structural behavior of unreinforced masonry walls and buildings using DEM

Pulatsu, Bora
Erdogmus, Ece
Lourenço, Paulo B.
Lemos, Jose V.
Tuncay, Kağan
In this study, a novel computational modeling strategy is proposed to estimate the lateral load capacity and behavior of unreinforced masonry (URM) structures. All commonly noted failure mechanisms are captured via the proposed modeling strategy using the discrete element method (DEM) in three-dimensions (3D). Masonry walls are represented as a system of elastic discrete blocks, where the nodal velocities are evaluated by integrating the equations of motion using the central difference method. Then, the mechanical interactions among adjacent blocks are examined utilizing the relative contact displacements and employed in the contact stress calculation. Through this research, a new stress-displacement contact constitutive model is considered and implemented in the commercial software 3DEC, which includes softening stress-displacement behavior for tension, shear, and compression along with the fracture energy concept. The results of the discontinuum models are validated on smalland large-scale experimental studies available in the literature with good agreement. Furthermore, important inferences are made regarding the effect of block size, the number of contact points, and contact stiffness values for robust and accurate simulations of masonry walls.


Probabilistic approach to assess URM walls with openings using discrete rigid block analysis (D-RBA)
Pulatsu, Bora; Gonen, Semih; Parisi, Fulvio; Erdogmus, Ece; Tuncay, Kağan; Funari, Marco Francesco; Lourenco, Paulo B. (2022-12-01)
This study aims to improve our current understanding of the seismic assessment of load-bearing unreinforced masonry (URM) systems by proposing a probabilistic computational modeling framework using the discrete element method (DEM). The main objective is to predict the structural behavior and capacity of URM walls with openings subjected to lateral loading, considering uncertainties in material properties. The proposed modeling strategy represents masonry as an assembly of rigid blocks interacting along the...
Simplified Approach for In-Plane Strength Capacity of URM Walls by Using Lower-Bound Limit Analysis and Predefined Damage Patterns
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In this study, a two-phase simplified approach is proposed to predict the in-plane strength capacity of unreinforced masonry (URM) walls. In the first phase, in-plane damage and failure patterns of URM walls are determined from available observational (field) data, experimental data and also from numerical analysis data. Then, a set of rules are proposed to estimate damage and failure patterns of URM wall panels. In the second phase, this valuable information is employed to develop a simplified numerical mo...
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in this study, a new design method is proposed for V-shaped planar array geometry for two-dimensional azimuth and elevation angle estimation. The proposed method is similar to filter design in signal processing. This method determines the V-shaped array geometry which gives the best 2-D angle estimation performances for the specified design parameters. The best geometry is determined by using Cramer-Rao Bound (CRB) and performance comparison is done with other planar array geometries.
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Aslan, Anıl; Kocaman, Serdar; Department of Electrical and Electronics Engineering (2019)
Theoretical modeling and numerical verification are essential in integrated photonics for designing optimized structures as well as interpretation of the experimental results. In this thesis, a dynamically changing refractive index modification for the Finite Difference Time Domain (FDTD) method is proposed, implemented with C++ and results are compared with recent experimental studies. The proposed method is based on the idea of the time-domain simulation of the non-stationary objects while satisfying the ...
Analysis and design of conformal frequency selective surfaces /
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Citation Formats
B. Pulatsu, E. Erdogmus, P. B. Lourenço, J. V. Lemos, and K. Tuncay, “Simulation of the in-plane structural behavior of unreinforced masonry walls and buildings using DEM,” Structures, pp. 2274–2287, 2020, Accessed: 00, 2020. [Online]. Available: