EVALUATION FOR BUCKLING STRENGTH AND SEISMIC PERFORMANCE OF SINGLE LAYER RETICULAR DOMES UNDER DEAD AND SEISMIC LOADS

Abstract

 The present paper discusses on ultimate strength of single layer reticular domes under dead and seismic loads and proposes a method to evaluate seismic performance which can be applied to for structural design. The domes are supported by pins at its circular periphery. The safety factor for dead load is set up for an analysis parameter. First, classical buckling load under the dead and seismic loads is newly derived mathematically based on a simple approximation, followed by comparison with the linear buckling load calculated using FEM analysis. Second, elastic buckling loads considering geometrical imperfections are calculated. Imperfection sensitivity is discussed, and a formula is proposed to evaluate elastic buckling loads based on the formula. Third, elastic plastic buckling loads considering geometrical imperfections are calculated. Then, the results are compared with and those evaluated using an approximate equation of Modified Dunlerley's equation. Finally, the dynamic ductility indexes based on the previous study of the domes are calculated, and an efficient scheme is proposed to evaluate of the seismic performance of the domes from a point of practical application.