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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.

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Abstract

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.

Impact and interest:

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ID Code: 3700
Item Type: Journal Article
Keywords: concrete construction, formwork, post, tensioned concrete, post, tensioning, structural design
DOI: 10.1061/(ASCE)0733-9364(2005)131:2(203)
ISSN: 0733-9364
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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