Reducing slab deflections in fast-track construction with the formwork strip model


A formwork strip method was used in the construction of a four-storey hotel, with C40 concrete floor slabs of 250 mm thickness and a span of 7.6 m. A curtain wall facade was used, which required the very low deflection of 8 mm at the midpoint of the slabs. A strip of permanent formwork was left in position across the building width at midspan when the adjacent table-forms were struck. The central props were not removed until several weeks following roof slab completion. Slab deflections were measured during construction, and complied with the design requirements. The formwork strip method gave significant cost savings and simplified mechanical and electrical installation. 6 refs.

Primary author(s): Isgren C;Vollum R;Webster R

Source: Concrete

             Vol.38, No.1, 2004, p.15-16




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