Structural response of a three-story precast concrete structure subjected to local diaphragm failures in a shake table test
Aidyngaliyev I. Zhang D. Fleischman R. Shon C.-S. Kim J.
February 2024Techno-Press
Computers and Concrete
2024#33Issue 2195 - 204 pp.
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.
diaphragm action , floor inertial force , precast concrete , shake table test , unexpected local diaphragm failures
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Department of Civil and Environmental Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Kazakhstan
Department of Civil Engineering and Engineering Mechanics, University of Arizona, United States
Department of Civil and Environmental Engineering
Department of Civil Engineering and Engineering Mechanics
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