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Computers and Concrete Volume 33, Number 2, February 2024 , pages 195-204 DOI: https://doi.org/10.12989/cac.2024.33.2.195 |
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Structural response of a three-story precast concrete structure subjected to local diaphragm failures in a shake table test |
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Ilyas Aidyngaliyev, Dichuan Zhang, Robert Fleischman, Chang-Seon Shon and Jong Kim
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| Abstract | ||
| Floor inertial forces are transferred to lateral force resisting systems through a diaphragm action during earthquakes. The diaphragm action requires floor slabs to carry in-plane forces. In precast concrete diaphragms, these forces must be carried across the joints between precast floor units as they represent planes of weakness. Therefore, diaphragm reinforcement with sufficient strength and deformability is necessary to ensure the diaphragm action for the floor inertial force transfer. In a shake table test for a three-story precast concrete structure, an unexpected local failure in the diaphragm flexural reinforcement occurred. This failure caused loss of the diaphragm action but did not trigger collapse of the structure due to a possible alternative path for the floor inertial force transfer. This paper investigates this failure event and its impact on structural seismic responses based on the shake table test and simulation results. The simulations were conducted on a structural model with discrete diaphragm elements. The structural model was also validated from the test results. The investigation indicates that additional floor inertial force will be transferred into the gravity columns after loss of the diaphragm action which can further result in the increase of seismic demands in the gravity column and diaphragms in adjacent floors. | ||
| Key Words | ||
| diaphragm action; floor inertial force; precast concrete; shake table test; unexpected local diaphragm failures | ||
| Address | ||
| Ilyas Aidyngaliyev, Dichuan Zhang, Chang-Seon Shon and Jong Kim: Department of Civil and Environmental Engineering, School of Engineering and Digital Sciences, Nazarbayev University Robert Fleischman: Department of Civil Engineering and Engineering Mechanics, University of Arizona | ||