The University of Southampton
University of Southampton Institutional Repository

Progressive collapse mitigation using CMA in RC framed buildings

Progressive collapse mitigation using CMA in RC framed buildings
Progressive collapse mitigation using CMA in RC framed buildings
Mitigation of progressive collapse after an initial failure has become a primary concern of engineers in recent years. Often alternative load paths are sought to redistribute load from the damaged area. It has been recognised for some time that the omission of compressive membrane action (CMA), also termed ‘arching action’, can lead to a significant underestimation of load capacity. An investigation has been conducted to ascertain whether the additional load carrying capacity from CMA can provide an inherent alternative load path to aid robustness.

A series of scaled specimens with industry standard detailing have been designed for an experimental investigation. Reinforced concrete elements were modelled in the double span scenario once an intermediate column has been removed. The test rig used allows the central support to be removed followed by the application of a point load applied at midspan; the system is determinate including measurement of the horizontal reaction. Subsequent to the flexural response two modes of membrane action are induced, initially compressive until tensile membrane extends load capacity at high values of deflection. The response during the latter tensile phase is outside the scope of this research.

Comparisons of experimental data with analytical methods inclusive of CMA have demonstrated that whilst conservative the method by Merola (2009) provides a reasonable prediction. This method has been utilised in a study of a series of flat slab structures with a range of column spacings. The inherent restraint stiffness provided by the surrounding slab and frame has been quantified using FEA and has allowed for the extent to which CMA can improve the robustness of a structure to be determined.
University of Southampton
Punton, B.
3f833683-15a9-4691-88ab-17f11c5ab688
Punton, B.
3f833683-15a9-4691-88ab-17f11c5ab688
Moy, Stuart
d1b1f023-d32a-4b00-8a3f-17c89f91a51e

Punton, B. (2014) Progressive collapse mitigation using CMA in RC framed buildings. University of Southampton, Engineering and the Environment, Doctoral Thesis, 259pp.

Record type: Thesis (Doctoral)

Abstract

Mitigation of progressive collapse after an initial failure has become a primary concern of engineers in recent years. Often alternative load paths are sought to redistribute load from the damaged area. It has been recognised for some time that the omission of compressive membrane action (CMA), also termed ‘arching action’, can lead to a significant underestimation of load capacity. An investigation has been conducted to ascertain whether the additional load carrying capacity from CMA can provide an inherent alternative load path to aid robustness.

A series of scaled specimens with industry standard detailing have been designed for an experimental investigation. Reinforced concrete elements were modelled in the double span scenario once an intermediate column has been removed. The test rig used allows the central support to be removed followed by the application of a point load applied at midspan; the system is determinate including measurement of the horizontal reaction. Subsequent to the flexural response two modes of membrane action are induced, initially compressive until tensile membrane extends load capacity at high values of deflection. The response during the latter tensile phase is outside the scope of this research.

Comparisons of experimental data with analytical methods inclusive of CMA have demonstrated that whilst conservative the method by Merola (2009) provides a reasonable prediction. This method has been utilised in a study of a series of flat slab structures with a range of column spacings. The inherent restraint stiffness provided by the surrounding slab and frame has been quantified using FEA and has allowed for the extent to which CMA can improve the robustness of a structure to be determined.

Text
BPunton Thesis December 2014.pdf - Version of Record
Available under License University of Southampton Thesis Licence.
Download (7MB)

More information

Published date: December 2014
Organisations: University of Southampton, Infrastructure Group

Identifiers

Local EPrints ID: 376664
URI: http://eprints.soton.ac.uk/id/eprint/376664
PURE UUID: 96cf2dfc-9288-4910-8aa1-04ad4a9fe7ec

Catalogue record

Date deposited: 06 Jul 2015 11:42
Last modified: 29 Nov 2018 17:31

Export record

Contributors

Author: B. Punton
Thesis advisor: Stuart Moy

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×