Vf" L

Iteration n

*efif

g) Adopt an effective cross-section with be2, ceff and reduced thickness fred corresponding to xn

Figure 4.3: Compression resistance of a flange with an edge stiffener

(8) If x < 1 it may optionally be refined iteratively, starting the iteration with modified values of p obtained using 4.2(5) with crcom Ed equal to x/yb^Mi> so that:

(9) If iteration is carried out, it should be continued until the current value of x is approximately equal to, but not more than, the previous value.

(10) The reduced effective area of the stiffener red allowing for flexural buckling should be taken as: ^s.red = X^s -(4.14)

(11) In determining effective section properties, the reduced effective area ASTe(1 should be represented by using a reduced thickness rred = x t for all the elements included in As.

(12) The effective section properties at serviceability limit states should be based on the design thickness t. 4.3.2.3 Simplified procedure

(1) As an alternative to the general procedure given in 4.3.2.2, the following simplified procedure may be used to determine the reduced effective area As red of an edge stiffener as shown in figure 4.2.

(2) The effective cross-sectional area, of the edge stiffener As should be obtained from:

in which the effective widths be2, ceff ^eff should be obtained as in 4.3.2.2(3) and (4), except that p should be obtained from 4.2(5) with ocom Ed equal to x/y/7mi > so that:

(3) The reduction factor x niay be taken as equal to 0,5 if:

/s > 0,31(1,5 + h/bp)(fyb/E)2(bp/t)3A2 ...(4.17)

otherwise the reduction factor x may be taken ¡as approximately equal to 1,0 if:

/s > 4,86(1,5 + h/bp)(fyb/E)2(bp/t)3A2 ...(4.18)

where: |

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