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Improved prediction of pre-camber of post-tensioned prestressed i-beam

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Main Authors: Wahid, Omar, Assoc. Prof. Dr., Tan, Pui Lai, Lee, Poh Hua, Roslina, Omar
Other Authors: drwahid@utm.my
Format: Article
Language:English
Published: The Institution of Engineers, Malaysia 2011
Subjects:
Creep coefficient
Pre-camber
Post-tensioned beam
Standard codes
Online Access:http://dspace.unimap.edu.my/xmlui/handle/123456789/13662
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spelling my.unimap-136622011-09-04T07:53:48Z Improved prediction of pre-camber of post-tensioned prestressed i-beam Wahid, Omar, Assoc. Prof. Dr. Tan, Pui Lai Lee, Poh Hua Roslina, Omar drwahid@utm.my puilai_tan@hotmail.com phuatl@pd.jaring.my roslina_omar@hotmail.com Creep coefficient Pre-camber Post-tensioned beam Standard codes Link to publisher's homepage at http://www.myiem.org.my/ An improved method of calculating pre-camber prediction in prestressed concrete beam is presented. It has been found that the current method of estimation that is widely practiced by local engineers which is based on BS 8110 is over simplified and inaccurate. Accurate prediction of the upward deflection or pre-camber due to prestressing of prestressed concrete beams is always difficult to attain. Inaccurate estimation of pre-camber usually leads to complications in construction and may incur additional cost. This paper presents an improved pre-camber prediction of prestressed I-beam that adopts the equivalent weight method with the inclusion of concrete creep factor into the deflection equation. While creep is often ignored or underestimated, it is being considered in the calculation as it was identified to significantly increase pre-camber, even at an early age. Laboratory tests were conducted to obtain compressive strength, elastic modulus, creep and shrinkage of concrete. These properties were used in the evaluation of pre-camber. The accuracy of the prediction was compared against the actual pre-camber measured on four post-tensioned ‘I’ beam with overall height of 1.98m and 36m in length for a duration of 15 days after the application of prestressing force. Based on the comparison, the improved method seems to provide better results compared to the commonly adopted simplified method. The suitability of the concrete properties, especially creep coefficient recommended by various foreign standard codes - BS 8110, EC 2, ACI and AS 3600 for application on local concrete is also examined. The method presented is readily available for local engineers to adopt. 2011-09-04T07:53:48Z 2011-09-04T07:53:48Z 2008-03 Article The Journal of the Institution of Engineers, Malaysia, vol. 69(1), 2008, pages 32-37 0126-513X http://www.myiem.org.my/content/iem_journal_2008-179.aspx http://hdl.handle.net/123456789/13662 en The Institution of Engineers, Malaysia
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Creep coefficient
Pre-camber
Post-tensioned beam
Standard codes
spellingShingle Creep coefficient
Pre-camber
Post-tensioned beam
Standard codes
Wahid, Omar, Assoc. Prof. Dr.
Tan, Pui Lai
Lee, Poh Hua
Roslina, Omar
Improved prediction of pre-camber of post-tensioned prestressed i-beam
description Link to publisher's homepage at http://www.myiem.org.my/
author2 drwahid@utm.my
author_facet drwahid@utm.my
Wahid, Omar, Assoc. Prof. Dr.
Tan, Pui Lai
Lee, Poh Hua
Roslina, Omar
format Article
author Wahid, Omar, Assoc. Prof. Dr.
Tan, Pui Lai
Lee, Poh Hua
Roslina, Omar
author_sort Wahid, Omar, Assoc. Prof. Dr.
title Improved prediction of pre-camber of post-tensioned prestressed i-beam
title_short Improved prediction of pre-camber of post-tensioned prestressed i-beam
title_full Improved prediction of pre-camber of post-tensioned prestressed i-beam
title_fullStr Improved prediction of pre-camber of post-tensioned prestressed i-beam
title_full_unstemmed Improved prediction of pre-camber of post-tensioned prestressed i-beam
title_sort improved prediction of pre-camber of post-tensioned prestressed i-beam
publisher The Institution of Engineers, Malaysia
publishDate 2011
url http://dspace.unimap.edu.my/xmlui/handle/123456789/13662
_version_ 1643790949499797504
score 13.222552

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