Multilevel formwork load distribution with posttensioned slabs
Kajewski, Stephen L. (2005) Multilevel formwork load distribution with posttensioned slabs. Journal of Construction Engineering and Management, 131(2), pp. 203-210.
Formwork and the associated shoring represent a significant proportion of the costs associated with the construction of multi-level concrete structures. To minimize these costs, a limited number of formwork and shoring sets are recycled up the structure as construction progresses, eliminating the need for a new set of formwork and shoring with each new slab. When a slab is post-tensioned using draped tendons, slab lift occurs as a portion of the slab self-weight is balanced. The formwork and shores supporting that slab are unloaded by an amount equivalent to the load balanced by the post-tensioning. This produces a load distribution through the structure that is inherently different from that of a conventionally reinforced slab. This paper presents two design methods suitable for modeling the multi-level formwork process for post-tensioned slabs: a modification to the simplified analysis method and a finite element model – both techniques will be of immediate use by industry practitioners and of interest to researchers examining the load distribution phenomenon. The paper also summarizes the findings of one of only a few research projects (Kajewski, 1997, 1998) in which actual shore loads were monitored during the construction of a multi-level post-tensioned building, which is used to validate the proposed design models.
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|Item Type:||Journal Article|
|Keywords:||concrete construction, formwork, post, tensioned concrete, post, tensioning, structural design|
|Subjects:||Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
Past > Schools > School of Urban Development
|Copyright Owner:||Copyright 2005 American Society of Civil Engineers|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||30 Mar 2006|
|Last Modified:||29 Feb 2012 23:11|
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