RESEARCH ON OVERALL STABILITY OF STEPPED ELLIPTICAL PARABOLOID LATTICED SHELL

One stadium roof structure consists of ladder-type elliptical paraboloid latticed shell with the form of double-layer Kewitte. The members of lower chord in the top layer keep continuous with the members of upper chord in the bottom layer. The state of these members turned from tension into press in the process of force transmission. It was studied the overall stability using linear and nonlinear buckling analyses. Some members of the shell had turned into plastic state before the critical point of buckling. But the structure still remained the carrying capacity simultaneously. The elastic-plasticity buckling began from the members of the overlap between the top layer and the bottom layer of the shell. The yield members lost the carrying capacity for load increment, which led to the overall buckling.