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Figure 5.6. Two different ways of defining the basic 10%-criterion for ignoring second order effects, see text above. (The interaction diagram was calculated for rectangular cross section 400 x 600 mm, concrete C35, w = 0,1 (total mechanical reinforcement ratio), edge distance of reinforcement 60 mm.)

5.8.3 Simplified criteria for second order effects 5.8.3.1 Slenderness criterion for isolated members

C5.8.3. Simplified criteria for ignoring 2nd order effects

C5.8.3.1 Slenderness limit for isolated members 5.8.3.1.1 General

The load bearing capacity of a member in compression for low slenderness ratios is illustrated in figure 3-1 by means of interaction curves, calculated according to the general method in 5.8.6.

(See chapter 6 in this report for more details about interaction curves and the general method.)

0 0,5 1 1,5 2 2,5 3 3,5 4 4,5 5 5,5 Figure 5.7. Interaction curves for low slenderness ratios, calculated for a pin-ended column with cross section as for figure 2-1 and subjected to a constant first order moment. Effective creep ratio ^ef = 0. Equal first order end moments M01 = M02 = M0.

By combining figures 5.7 and 5.6, one can find the slenderness ratios for which the basic 10%-criterion is fulfilled; see figure 5.8.

0 0

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