NUMERICAL MODELING OF CONFINED MASONRY WALLS UNDER QUASI-STATIC LOADS USING THE STRUT MODEL WITH FINITE ELEMENT METHOD

• Main Author: Aryadenata, Dimas
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/87630
• Institution: Institut Teknologi Bandung

Indonesia being a seismically active region combined with the prevalence of buildings constructed without adequate structural design processes, has resulted in a high level of damage when earthquakes occur. Even in standard structural design practices, the contribution of masonry walls to the stiffness and strength is often neglected, despite their significant role. In Indonesia, masonry walls remain one of the most commonly used structural elements due to cost-efficiency considerations. Therefore, modeling confined masonry walls to understand their structural response presents a new challenge that requires greater attention. To understand the modeling approach for confined masonry walls under quasi-static loads, a finite element-based strut model was performed using OpenSees program and the OpenSees Navigator interface. The equivalent diagonal struts were modeled using a Truss element with Hysteretic material for monotonic analysis and Pinching4 material for cyclic analysis, while the confining frame were modeled using HingeBeamColumn elements with Concrete02 material for concrete and Steel02 for reinforcing steel. The analysis results showed a reasonably good agreement with experimental results from previous study. Further analysis revealed that the backbone curve, pinching parameters, and cyclic degradation parameters significantly influenced the accuracy of the modeling. Evaluations of unloading and reloading stiffness, strength, and energy dissipation capacity yielded average ratios between numerical and experimental results of 1,05; 0,851; 0,964; and 1,217; respectively, indicating a satisfactory level of accuracy. However, the evaluation of structural ductility values showed a ratio of 2,06. The inability of the model to fully capture the pinching effect resulted in inaccuracies in the energy distribution for each loading cycle, contributing to the discrepancy in the structural ductility values.