Twoway slabs

Unlike BS 8110 there is no specific guidance given in Eurocode 2 on how to determine the bending moments for a two-way slab. The assessment of the bending moment can be carried out using any suitable method from Section 5 of the Code. However, co-efficients may be obtained from Table 8 (taken from the Manual for the design of building structures to Eurocode 29) to determine bending moments per unit width (Msx and Msy) where:

Msx = bsx wlx2 Msy= bsy wlx2

Where bsx and bsy are coefficients, lx is the shorter span and w (load per unit area) is the STR ultimate limit state combination. For more information on combinations refer toChapter 1, originally published as Introduction to Eurocodes3

Table 7

vRd,c resistance of members without shear reinforcement, MPa

rI =

Effective depth, d (mm

)

As/(bd)

<200

225

250

275

300

350

400

450

500

600

750

0.25%

0.54

0.52

0.50

0.48

0.47

0.45

0.43

0.41

0.40

0.38

0.36

0.50%

0.59

0.57

0.56

0.55

0.54

0.52

0.51

0.49

0.48

0.47

0.45

0.75%

0.68

0.66

0.64

0.63

0.62

0.59

0.58

0.56

0.55

0.53

0.51

1.00%

0.75

0.72

0.71

0.69

0.68

0.65

0.64

0.62

0.61

0.59

0.57

1.25%

0.80

0.78

0.76

0.74

0.73

0.71

0.69

0.67

0.66

0.63

0.61

1.50%

0.85

0.83

0.81

0.79

0.78

0.75

0.73

0.71

0.70

0.67

0.65

1.75%

0.90

0.87

0.85

0.83

0.82

0.79

0.77

0.75

0.73

0.71

0.68

>2.00%

0.94

0.91

0.89

0.87

0.85

0.82

0.80

0.78

0.77

0.74

0.71

k

2.000

1.943

1.894

1.853

1.816

1.756

1.707

1.667

1.632

1.577

1.516

Table derived from: vRd,c = 0.12 k (100p| fck)1/3 > 0.035 k15 fck0 5 where k = 1 + R(200/d) < 2 and p | = As/(bd) < 0.02

Note

1 This table has been prepared for fc k = 30.

2 Where p | exceeds 0.40% the following factors may be used:

fck

25

28

32

35

40

45

50

Factor

0.94

0.98

1.02

1.05

1.10

1.14

1.19

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