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Differential axial shortening of concrete structures

Moragaspitiya, Praveen, Thambiratnam, David P., Perera, Nimal J., & Chan, Tommy H.T. (2009) Differential axial shortening of concrete structures. In 2nd Infrastructure Theme Postgraduate Conference, 26 March 2009, Queensland University of Technology, Brisbane.

Abstract

Non linear deformation of concrete has an adverse impact on high-rise buildings with complex geometries due to differential axial shortening. These adverse effects are caused by time dependent behaviour resulting in volume change known as “shrinkage”, “creep” and “elastic” deformation. These three phenomena govern the behaviour and performance of all concrete elements during and after construction. Reinforcement content, variable concrete modulus, volume to surface area ratio of elements, environmental conditions and construction quality influence the performance of concrete elements and differential axial shortening will occur in all structural systems. Their detrimental effects escalate with increasing height and non vertical load paths resulting from geometric complexity. The magnitude of these effects have a significant impact on building envelopes, building services, secondary systems and the life time serviceability and performance Analytical and test procedures available to quantify the magnitude of these effects are limited to a very few parameters and are not adequately rigorous to capture the complexity of true time dependent material response. With these in mind, a research project has been undertaken to develop an accurate numerical procedure to quantify the differential axial shortening of structural elements. The procedure has been successfully applied to quantify the differential axial shortening of a high rise building and the important capabilities available in the procedure have been discussed. Additionally, a new practical concept based on the variation of vibration characteristic of structure during and after the construction will be developed and used to quantify the axial shortening and to assess its performance. Keywords: Axial shortening, Concrete buildings, Creep, Shrinkage, Elastic deformation, Vibration characteristic of structure

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ID Code: 20369
Item Type: Conference Paper
Additional URLs:
Keywords: Axial shortening, Concrete buildings, Creep, Shrinkage,, Elastic deformation, Vibration characteristic of structure
ISBN: 9781741072709
Subjects: Australian and New Zealand Standard Research Classification > BUILT ENVIRONMENT AND DESIGN (120000) > BUILDING (120200) > Building Science and Techniques (120202)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2009 [please consult the authors]
Deposited On: 18 May 2009 07:41
Last Modified: 30 Apr 2011 22:02

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