Kajewski, S L (2005) Multilevel formwork load distribution with posttensioned slabs. Journal of Construction Engineering and Management, 131(2), pp. 203-210. ISSN 0733-9364
Abstract
Formwork and the associated shoring represent a significant proportion of the costs associated with the construction of multilevel 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 posttensioned 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 posttensioning. 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 multilevel formwork process for posttensioned 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 in which actual shore loads were monitored during the construction of a multilevel posttensioned building, which is used to validate the proposed design models.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | buildings; multistory; concrete construction; formwork; load distribution; post tensioning; slabs; structural design |
| Index terms: | formwork, concrete structure, modelling, design method, design model, practitioner, concrete construction, structural design |
| Subjects: | design process, structural engineering, building construction, design methods, practitioner, architectural engineering, analytical methods |
| Topics: | Design Practice, Roles and Professions, Construction Technology, Engineering Principles |
| Descriptive scope: | 2 PC |
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