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Structural Robustness of Concrete Flat Slab Structures

Sagaseta, Juan, Ulaeto, N and Russell, J (2016) Structural Robustness of Concrete Flat Slab Structures In: International Symposium on Punching Shear of Structural Concrete Slabs - Honoring Neil Hawkins ( In fib bulletin 81), 2016-10-23 - 2016-10-27, Philadelphia.

Robustness of concrete flat slabs - Sagaseta_final.pdf - Accepted version Manuscript
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Current building regulations for design against progressive collapse normally use prescriptive rules and risk based qualitative scales which are insufficient to cover current needs in design. Structural robustness of concrete flat slab structures is examined using different theoretical models to capture the dynamic behavior under accidental events. In such extreme events, the large dynamic reactions at the connections could potentially lead to punching and progressive collapse. Punching formulae based on load-deformation response relationships such as the Critical Shear Crack Theory (CSCT) are particularly useful in dynamic situations. The Ductility-Centred Robustness Assessment developed at Imperial College London is also used in this paper to derive simple design formulae to assess punching of adjacent columns in the sudden column removal scenario which is commonly adopted in practice. The approach can be extended to assess flat slab systems upon considering membrane action in the slab and post-punching behavior in the connections. Analytical models for tensile membrane are used in combination with the CSCT to demonstrate that the tying forces required in codes of practice cannot be achieved without prior punching of the connections. It is also shown that numerical modelling of post-punching is a promising tool to review detailing provisions for integrity reinforcement.

Item Type: Conference or Workshop Item (Conference Paper)
Subjects : Civil Engineering
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Ulaeto, N
Russell, J
Date : 2016
Copyright Disclaimer : Copyright 2016 American Concrete Institute. Posted with the editor's permission.
Uncontrolled Keywords : Punching shear; structural integrity; robustness; progressive collapse; flat slabs; accidental actions
Depositing User : Symplectic Elements
Date Deposited : 14 Sep 2016 14:33
Last Modified : 16 Jan 2019 17:08

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