Avoiding Disproportionate Collapse

Full Session with Abstracts

335314-2 - Post-punching mechanism of flat slab-column joints subjected to downward punching shear action

Friday, April 20
1:30 PM - 3:00 PM
Location: 202B

The flat slab-column joint is prone to punching, which would cause progressive collapse of the whole structural system. The post-punching performance of joints has significant influences on the progressive collapse of flat slab systems. Existing researches focus on the behavior of the joints before and after upward punching shear (UPS) which commonly occurs when slabs being over-loaded by downward gravity. However, the downward punching shear (DPS) induced by upward loads acting on slabs, such as typhoon or explosion, is rarely being concerned. In this work, a quasi-static collapse test was conducted on four flat slab-column joint specimens. The effects of different punching directions on the post-punching performance of the joints were studied. The results illustrate that the post-punching bearing and deformation capacities are determined by the longitudinal reinforcement in the slab going through the column. For specimens without embedded beams, the steel bars in the slabs being punched in two different directions ruptured in reverse orders. The post-punching mechanisms of the specimens with the embedded beams were identical with the UPS specimens even though the punching shear actions were in the opposite directions.

Xinzheng Lu

Tsinghua University

Professor, Civil Engineering Department, Tsinghua University

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335314-2 - Post-punching mechanism of flat slab-column joints subjected to downward punching shear action



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