EFFECT OF GEOMETRICAL INITIAL IMPERFECTIONS ON THE ELASTO-PLASTIC BUCKLING LOAD OF RIGIDLY JOINTED SINGLE-LAYER LATTICED DOMES

Abstract

In the present paper, the effect of the geometrical initial imperfections on the buckling load of rigidly jointed single-layer latticed domes is investigated. The imperfection is assumed to be the similar shape of the first elasto-plastic buckling mode obtained form the elasto-plastic buckling analysis, and it is given only in the vertical direction at each node of the dome. As a result, the elasto-plastic buckling laod of the domes is estimated by using Modified Dunkerley Formulation as a function of λs or Λ with the knock-down factor γ. Here, it is shown that the curve of the buckling load of the domes is defined as a function of the amplitude of the imperfection.