Progressive Collapse Response of Reinforced Concrete Frame Structures with Masonry Infills
Publication: Journal of Engineering Mechanics
Volume 146, Issue 3
Abstract
The paper investigates the role of masonry infills on the progressive collapse response of reinforced concrete frame structures. A wide parametric investigation is carried out to assess the influence of frame aspect ratio, seismic detailing, and lateral constraint degree for the cases of bare and infilled frames. Numerical pushdown tests simulating a column-loss scenario are carried out on reference two-bay frames extracted from different 5-story frame buildings. Infill-frame systems are modeled by means of a refined nonlinear finite-element modeling approach experimentally validated. Bearing capacity under the column-loss scenario is compared with the expected dynamic load demand, highlighting most influencing parameters and determining capacity/demand ratios by means of an energetic approach. Results show a significant increase in strength and stiffness of infilled frames to vertical collapse with respect to bare frames, accompanied by substantial modification of damage framework, resisting mechanism, and overall safety margins. The adaptability of the common equivalent-strut modeling approach as a simple assessment method is finally tested, comparing results from refined finite-element models and simplified fiber section models.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request. (ATENA models).
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Information
Published In
Journal of Engineering Mechanics
Volume 146 • Issue 3 • March 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Feb 22, 2019
Accepted: Jul 17, 2019
Published online: Jan 9, 2020
Published in print: Mar 1, 2020
Discussion open until: Jun 9, 2020
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