Precamber

Table 2 Values for Kh

*

kh

100

1.0

200

0.85

300

0.75

>500

0.70

Notes ho is the notional size (mm) of the cross-section = 2Ac/u where

Ac = Concrete cross-sectional area u = Perimeter of that part of the cross section which is exposed to drying

Figure 7

Coefficient for development of creep with time after loading

A slab or beam can be precambered to reduce the effect of deflection below the horizontal (see Figure 8). However, in practice too much precamber is generally used and the slab remains permanently cambered. This is because of the difficulty in accurately calculating deflection. A precamber of up to half the quasi-permanent combination deflection could be used, but a lower figure is recommended. Precamber does not reduce the deflections affecting partitions or cladding.

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Responses

  • Wiseman Brownlock
    WHAT IS A PRECAMBER CONCRETE?
    8 years ago

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