Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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Downloaded From : www.EasyEngineering.netForms for Thin-Shell Roof Slabs 393ww.EasyEngineering.nFIGURE 13-6 Wood trusses installed to support formwork for circular shellroof. (Source: Construction Methods and Equipment)FIGURE 13-7 Formwork for a circular shell roof lowered for moving to newlocation. (Source: Construction Methods and Equipment)Downloaded From : www.EasyEngineering.net
394 Chapter ThirteenDownloaded From : www.EasyEngineering.netDecentering and Form RemovalDecentering and removal of formwork for thin-shell roof slabs ismore important than removal of shoring and formwork for walls andfloor slabs in the interior of a building. Upon removal of centeringand forms, the roof slab may be subjected to the permanent live loadof wind, whereas the permanent live load on a floor slab will notlikely occur until the full 28-day strength of the concrete is attained.Due to high deflections and high dead-load to live-load ratiosthat are common in thin-shell roof slabs, decentering and removal offormwork should not be permitted until appropriate tests have beenperformed to demonstrate that the specified concrete strength andmodulus of elasticity have been achieved. It is possible that adequatecompressive strength may be attained, but the modulus of elasticityww.EasyEngineering.nmay not be adequate. ACI 318 requires the use of field-cured beamtest specimens if form removal time is based on development of aspecified modulus of elasticity. The value of modulus of elasticitymust be obtained from flexural testing of field-cured beam specimens,not as a proportion of the compressive strength from the beamtest specimen.Decentering methods should be planned to prevent any concentratedreaction on any part of the permanent structure. Decenteringshould begin at locations of maximum deflection and progress tolocations of minimum deflection, with decentering of edge membersproceeding simultaneously with the adjoining shell.Downloaded From : www.EasyEngineering.net
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38 Chapter ThreeExample 3-7A floor
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120 Chapter FiveExample 5-12Class I
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Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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