Resumen de Reliability Analysis of Buckling Strength of Single Layer Reticulated Domes Under Severe Earthquakes
Toshimasa Yanagisawa, Shiro Kato
The present paper discusses reliability of dynamic buckling of single layer reticulated domes under dead and seismic loads. First, several domes with different safety factors for dead load are designed based on elasto-plastic buckling analysis. Second, the dynamic buckling loads obtained based on dynamic nonlinear analysis of these domes are analyzed aiming at formulating a mathematical expression for buckling loads in terms of related structural variables. Then, an equation for the dynamic buckling load is formulated explicitly in terms of the related variables. Third, concerning dynamic buckling under dead and seismic loads, a performance function for reliability is expressed in terms of seismic input acceleration intensity as action and buckling strength as resistance. Fourth, a trial is performed to evaluate an approximate value of reliability index using a performance function, then solved successively using AFOSM method, and the values of reliability index for reticulated domes using 50-year and 100-year reference periods are searched considering the related stochastic properties. Finally, the paper discusses the relationship between reliability index and safety factor for dead load in the two cases of reference period from a viewpoint of structural design for ordinary structures.
