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Local buckling curves for the design of FRP profiles
2012-08-25 18:17:38

 

The experimental tests on FRP profiles with glass fibers carried out by many researchers have confirmed that the design is governed by buckling, making the strength of the material not utilizable. In particular local buckling is related to the section shape, therefore its characterization is also indispensable not only for the verification and design of stocky elements, for example in truss structures, but it is also useful for reviewing and optimizing the actual shapes which have been realized copying the traditional steel profiles.
Regarding this topic, the present study has proved the following points:
1 It is confirmed that the FEM, also taking into consideration the shear strain, is a reliable method for providing the critical load due to local buckling;
2 The local buckling of the flange depends not only on the slenderness of the flange itself but also on the ratio between the slenderness of the flange and of the web;
3 An analytical formulation of a buckling curve for flange local buckling is developed individuating the expression of a mechanical slenderness that is comprehensive of all the parameters of the problem;
4 The formulation proposed provides an easy design method for I-shaped profiles when flange local buckling governs the structural behavior, that is safe in most
experimental cases considered.The experimental tests on FRP profiles with glass fibers carried out by many
researchers have confirmed that the design is governed by buckling, making the
strength of the material not utilizable. In particular local buckling is related to the
section shape, therefore its characterization is also indispensable not only for the
verification and design of stocky elements, for example in truss structures, but it is
also useful for reviewing and optimizing the actual shapes which have been realized
copying the traditional steel profiles.
Regarding this topic, the present study has proved the following points:
O It is confirmed that the FEM, also taking into consideration the shear strain, is a
reliable method for providing the critical load due to local buckling;
O The local buckling of the flange depends not only on the slenderness of the flange
itself but also on the ratio between the slenderness of the flange and of the web;
O An analytical formulation of a buckling curve for flange local buckling is
developed individuating the expression of a mechanical slenderness that is comprehensive
of all the parameters of the problem;
O The formulation proposed provides an easy design method for I-shaped profiles
when flange local buckling governs the structural behavior, that is safe in most
experimental cases considered.

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