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2.5 Edge beam (interior span)

2.5.1 Cover for durability and fire resistance

Nominal cover for exposure class 2b (external) is 35 mm NAD

Table 6

Nominal cover for 1 hour fire resistance is 20 mm. BS 8110 _ Table 3.5

Use 40 mm nominal cover to links

2.5.2 Loading

Permanent load from slab = 4.7 x 5 x 1.25 = 29.4 kN (assuming 1.25 m strip to be loading on edge beam) Self-weight of beam = (0.35 - 0.175) x 0.3 x 5 x 24 = 6.3 kN Cladding load @ 5 kN/m = 5 x 5 = 25 kN Characteristic permanent load = 60.7 kN Characteristic imposed load = 4 x 5 x 1.25 = 25 kN

Total design load = 1.35 x 60.7 + 1.5 x 25 = 119.5 kN

2.5.3 Design moments and shears

These are taken from the Concise Eurocode, Appendix, Table A.1(5).

2.5.3.1 Interior support

Moment

= 0.10 x

119.5 x

5 = 59.8 kNm

Shear

= 0.55 x

119.5 =

65.7 kN

2.5.4 Reinforcement for flexure 2.5.4.1 Interior support

Assume effective depth = 280 mm M 59.8 x 106

bd2f 2802 x 300 x 32

0.099 (Section 13, Table 13.1)

Use 2T20 (628 mm2)

Assume effective depth = 290 mm

Effective flange width = 300 + 0.1 x 0.7 x 5000

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