Eigen mode initial imperfection influence on behaviour of thin-walled systems

conference paper

English

The article deals with initial imperfection shape similar to first eigen mode buckling of thin-walled structures, i.e. systems made of slender plate elements. It was found out that initial imperfections exhibited the greatest influence on stress state in crack-prone areas and deflection. The behaviour of steel girders is substantially affected by the buckling of the girder web, which for the kind of loading considered, is characterized by a diagonal buckled pattern the width and inclination of which depend on the rigidity of the peripheral elements of the web, i.e. of the flanges and stiffeners. When the loading is quasi-constant, the failure mechanism consists of a diagonal plastic band in the web sheet and a system of more or less developed plastic areas in its boundary elements. The problem will be investigated on the girder which has two and four square web panels and is loaded at its mid-span by a point load; hence, the web panels are subjected to combined shear and bending. The study observes stress state on thin-walled web and deflection shape under various loading level and with various boundary conditions. To solve the problem by means of FEA, the program system ANSYS was used.

inital imperfection, thin-walled steel

KALA, J.; KALA, Z.; ŠKALOUD, M.; TEPLÝ, B.

2005

12. 9. 2005

Varšava, PL

83-908867-9-0

Lightweight Structures in Civil Engineering

137

140

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