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Item type:Publication, Efficient beam-based model for reinforced concrete walls considering shear-flexure interaction(Elsevier Ltd, 2024-09-15)This paper presents an efficient beam-based modelling scheme for the seismic analysis of reinforced concrete structural walls. The model combines a force-based beam element with a fibre section for flexural response and a zero-length element for shear response. The fibre-based element simulates the nonlinear flexural behaviour through uniaxial material laws that account for concrete cracking, concrete crushing, and yielding and rupture of reinforcing bars. The zero-length element represents the shear behaviour with a trilinear lateral force-displacement curve representing, in a phenomenological way, nonlinear deformations caused by diagonal cracking. The reduction of shear resistance caused by inelastic flexural deformations is accounted for in the model to reproduce failures due to shear-flexure interaction. The model has been validated using data from 52 tests on wall specimens exhibiting flexure, shear and mixed shear-flexure modes from experimental campaigns reported in the literature, showing good accuracy in predicting the effective stiffness, maximum strength and displacement capacities obtained in the tests. Model results for ultimate displacement capacity correlate better with experimental results than simplified code-oriented expressions in performance-based evaluation standards and recommendations. Considering its balanced accuracy and computational efficiency, it is concluded that the proposed modelling scheme can effectively be used for performance-based seismic design and assessment of RC wall buildings. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Numerical simulation of Peruvian RC wall buildings using an efficient beam-based model(International Association for Earthquake Engineering, 2024-01-01)In countries of high seismicity, such as Peru and Chile, the typical medium-to high-story buildings use reinforced concrete (RC) walls as their lateral load-resisting system owing to an overall satisfactory behaviour in previous seismic events. The advent of performance-based methods for seismic design of buildings demands nonlinear structural models that are efficient, reliable, and easy to calibrate. In the case of RC wall structures, such models have to consider the prominent flexure-shear interaction of wall members. This study employs an efficient beam-based computational model considering flexure-shear interaction to simulate the seismic response of three prototype RC wall structures representative of modern Peruvian buildings. These structures' geometrical, reinforcement and loading conditions were determined by analyzing a database of 20 buildings constructed in Peru between 2010 and 2022. The wall computational model, developed in OpenSees, uses fibre-based beam-column elements to simulate the flexural response and a zero-length element connected in series for the shear response. Uniaxial concrete and steel laws are combined with appropriate regularization and fatigue criteria to reproduce flexural failures due to concrete crushing and bar fracture. Shear deformations and failure are modelled using a phenomenological trilinear shear force-deformation model in the zero-length element, which is affected by the flexure demands to consider flexure-shear interaction effects. Nonlinear analyses of the wall structures were conducted with the proposed modelling approach. The research aims to study the typical failure of RC wall buildings, their displacement capacity, and the displacement and shear force demands. The nonlinear evaluation shows that displacement capacity averages 11.2‰ total drift. A primary failure mode corresponds to concrete crushing of walls by flexural deformation because of their highest axial load and lower confinement zones. The rare earthquake demands an average of 8.4‰ total drift in the flexible direction of the buildings, and the average amplification over the shear design force is 3.1 in both directions.