B. TECHNICAL

11. Verification of local load initiation

By profiling the web, the application of stiffeners can largely be dispensed with when initiating individual loads - eg. by means of purlins or secondary beams. Ascertaining the load bearing capacity by introducing stiffener-free loads in accordance with the principles of DIN ([1], clause 744) or according to the procedure suggested in [6] and [7] ensures that

• no local buckling (web crippling) occurs and
• deformation in the flange is kept sufficiently low.

a ... load distribution width ts ... web plate thickness

Fig. 2: Stiffener-free load initiation onto the corrugated web.

If rolled profiles are supported directly, the load distribution widths "a" can be taken from dimensioning guides for profile constructions. The bearing loads for the web thicknesses contained in the production range and various load distribution widths "a" are summarized in Table 3.