抄録
The present paper proposes an effective method to evaluate elasto-plastic buckling loads of two-way single-layer lattice domes, stiffened by diagonal braces, under vertical uniform and non-uniform loads. The domes are shallow and composed of grid chord members, connected rigidly at nodes, and supported by pins at four sides of rectangular plan. First, a formula for linear buckling load is derived based on equivalent shell analogy, followed by a study for a knockdown factor of elastic buckling loads considering geometrical initial imperfections of a magnitude up to L0/1000 for a span L0. The value of 0.65 or a lesser value for a knockdown factor is recommended for use to evaluate elastic buckling loads. Second, column strength curves are discussed and proposed for elasto-plastic buckling loads, and finally, the proposed strength curves are proven effective for evaluating the strength.
