Cracking and Deflection Behaviour of Partially Prestressed High Strength Concrete Beams

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Title Cracking and Deflection Behaviour of Partially Prestressed High Strength Concrete Beams
Author Chowdhury, Sanaul Huq
Publication Title Coneference Preedings of the Australasian Structural Engineering Conference (ASEC): Engaging with Structural Engineering
Editor Emad Gad and Bill Wong
Year Published 2008
Place of publication Melbourne
Publisher The Meeting Planners
Abstract High strength concrete (HSC) has revolutionised the construction industry in the 1980's and in recent years a marked increase in the use of HSC (compressive strength, f′c > 50 MPa) has been evident in construction projects around the world. HSC is more brittle than normal strength concrete (NSC). As such, the problem of cracking is more pronounced for HSC structures because of the higher brittleness in comparison to their NSC counterparts. Further, by using HSC, smaller cross-sections with reduced dead load and longer spans can be designed. For the smaller cross-sectional members, excessive deflections may become a problem. In order to investigate the cracking and deflection behaviour of partially prestressed high strength concrete beams, 4 full-size beams have been tested to failure in which measurements were made of mid-span deflections, crack spacings and crack widths at different load levels. The simply-supported beams had varying span lengths, reinforcement ratios, concrete compressive strengths and degrees of prestressing. The concrete strengths for the beams varied from 99.3 to 103.1 MPa. As expected, the beams exhibited less ductile and bordering on brittle behaviour characteristic of high strength concrete. There was less number of cracks developed but the cracks extended to much larger widths with increasing loads. Two of the major code methods – the ACI Code and the Australian Standard - were used to predict mid-span deflections for the test beams and were compared with the experimental results. Both the code methods have been found to be inconsistent in either under- or overpredicting the deflections.
Peer Reviewed Yes
Published Yes
Publisher URI
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Copyright Statement Copyright remains with the author 2008. The attached file is posted here with permission of the copyright owner for your personal use only. No further distribution permitted. For information about this conference please refer to the publisher's website or contact the author.
ISBN 978 1 877040 69 6
Conference name Australasian Structural Engineering Conference (ASEC)
Location Melbourne
Date From 2008-06-26
Date To 2008-06-27
Date Accessioned 2009-02-03
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Structural Engineering
Publication Type Conference Publications (Full Written Paper - Refereed)
Publication Type Code e1

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