engleski

Structural stability analysis of reticulated dome

This paper deals with stability analysis of a single layer reticulated ultralight dome and the influence of various geometrical imperfections on the load capacity of the structure. Amplitude and the shapes of imperfections are not initially known, therefore, properly scaled critical buckling modes are used as initial imperfections (Lazarevic, Andelic and Uros [3]). Except geometric nonlinearity, material nonlinearity is also used because of the high element stresses. A single layer aluminium dome with triangular pattern is studied. The numerical simulations are performed on the spatial model using geometrical and material nonlinear dynamic analyses with large displacements and small strains. Two types of imperfections are used, which correspond to the first positive eigenvector and the deformed shape from the dead weight. There are two sets of amplitudes defined for each type of imperfection (5 and 10 cm). As a result, the equilibrium curves with precritical and postcritical regions are obtained.

Stability ; Geometric imperfections ; Critical force ; Nonlinear analysis

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