Abstract
This paper reviews the research on the deflection of the orthotropic flat membrane and saddle membrane under the external snow load. First the authors analyze the characteristics of snow load and obtain the standard snow load. Second we build the models of the orthotropic flat membrane and saddle membrane under the snow load. Then we deduce and solve the equations set of the two membranes under the effect of the pretension with the perturbation method. So we obtain the relational expression between the maximum deflection of the membrane’s centre point and the external load. At last, suppose that the load was determinate, the authors analyze the change of the deflection of the centre point of the membrane with different pretensions, side lengths and other parameters.
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