Staircase Reinforcement

Reinforcement ratio = - = 0.0051

1000 x 149

Near support

VRd1 = 0.35 x (1.6 - 0.175) x (1.2 + 40 x 0.0051) x 149 = 104.3 kN 4.3.2.3

Eqn 4.18

1/ > V = 44.9 kN, hence no shear reinforcement required

2.9.7 Deflection

Reinforcement ratio at mid-span = 0.51%

Concrete is lightly stressed, hence basic span/effective depth ratio is 32. Table 4.14

Since f. = 460, this should be modified to:

32 x 400/460 x 754/601 = 34.9 4.4.3.2(4) Actual span/effective depth ratio = 5060/149 = 34 < 34.9 OK

2.9.8 Cracking

As for floor slab in Section 2.3.8

Minimum area of reinforcement = 183 mm2/m 4.4.2.2

Thickness of waist = 175 < 200 mm 4.4.2.3 (1) No further check is necessary.

2.9.9 Tie provisions

E-W internal tie, the minimum area required = 91 mm2/m BS 8110

Total area for staircase = 91 x 3 = 273 mm2

Provide 2T12 tie bars each side of staircase in adjacent slab

2.9.10 Reinforcement details

The reinforcement details are shown in Figure 2.17.

The reinforcement details are shown in Figure 2.17.

Staircase Reinforcement
Figure 2.17 Staircase reinforcement details
+3 -5

Responses

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    How to design a concrete stair eurocode 2?
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    Why used hanger bar used in waste slab in staircase?
    5 years ago
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    2 years ago

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