Laps

At A^check lap 1 no.H20 B to 2 no.H20 B in rib full tension lap

: 1.0 (cd = 45 mm, i.e. < 3p) : 1.5 (as > 50% being lapped) : ((/ 4) (O-sd / fbd)

At_BA

1.0 x 1.5 x (20 / 4) x 434.8 / 3.0 1087 mm, say = 1200 mm

B, check lap 2 no. H12 T to 2 no. H16 T in rib - full tension lap

where a1 a6

: 0.7 (cd = 45 mm, i.e. > 3q>) ■■ 1.5 (as > 50% being lapped) : (?/ 4) / fbd)

= 2.1 (3.0 MPa as before but n = 0.7 for not good bond conditions)

Exp. (8.6) <SMDSC[21]> <Exp. (8.10)> <Table 8.2>

= 651 mm, say = 700 mm But to aid prefabrication take to solid/rib intersection 1000 mm from centre of support.

0,min

At BA and BC check lap 1 H16 B to 2 H20 B in rib By inspection, nominal say, 500 mm

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