Eh

M-5d p-

y

Figure 2.12 Critical perimeter for punching

VaM = 0.35 x 1.075 x 1.2 x 525 x 6.15 = 1458 kN 4.3.4.5.1

Area within perimeter = 2.98 m2 Area of base = 7.56 m2

Design shear (fSd) = (7.56 - 2.98) x 238 = 1090 kN 4.3.4.1(5)

1/ < V hence no requirement for shear reinforcement

2.7.6 Cracking

Approximate steel stress under quasi-permanent loads

460 (908 + 0.3 x 383) 2310 .„ ... 2 = - x - x - = 186 N/mrrr

1.15 1801 2830

From EC2 Table 4.11 bar size should not exceed 25 > 20 mm used. 4.4.2.3

Hence cracking UK

2.7.7 Reinforcement details

The reinforcement details are shown in Figure 2.13 and given in Table 2.7.

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