doi:10.3850/978-981-08-9247-0_rp088-icsas11

ABSTRACT

Load-bearing capacity of plane cross-section parts with intermediate stiffeners is defined by the resistance of the stiffener. The calculation of the load-bearing capacity of a stiffener according to Eurocode 3 makes reference to the over-all cross-section by the model of a column on elastic Winkler-type foundation. The elastic foundation of this column is provided by the boundary conditions of the adjacent plane cross-section parts. For stiffeners in the flanges of trapezoidal sheeting this is normally provided by the support at the webs. The calculation of the effects of the insulation material on the load-bearing capacity of a plane cross-section part can according to Misiek and Hassinen also be done via the model of an elastic foundation. Therefore, the properties of the elastic half-space have to be transferred to a Winkler-type foundation model. The inclusion and addition of both stabilization effects in the usual design and calculation procedures is explained. This can be helpful in the design of trapezoidal sheeting with a bonded insulation material which is used in some cases of decorative refurbishment. As there is no second metallic face layer, the insulation has to be protected by metallic or plastic foils. Obviously, there is no composite behaviour which could be activated in design. Therefore the design and calculation procedures resemble the ones for conventional trapezoidal sheeting, but taking into account the additional stiffening effect of the insulation material for both plane cross-section elements and stiffeners. Based on the knowledge obtained with the design of trapezoidal sheeting, a new design and calculation concept for sandwich panels with lightly profiled faces is introduced. This design concept is based on the calculation of the plane cross-section parts between the stiffeners, then determining the buckling resistance of these stiffeners. These stiffeners will be also treated as columns on a Winkler-type elastic foundation, now provided only by the insulation material. For the calculation of the buckling resistance, a buckling curve is provided.

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