Life-Cycle Cost Analysis of a Point-Like Structure Subjected to Tornadic Wind Loads

Abstract

To quantify the monetary losses associated with damages induced by tornado wind storms, a numerical performance-based engineering framework complete with dynamic simulation of tornado-like wind fields, calculation of probabilities of structural performance for a point-like (monopole) structure and life-cycle cost analysis is presented. Within a Monte Carlo sampling environment, digitally simulated loads generated from five distinct tornado wind field models replicate aleatory and epistemic uncertainties concentrated in the aerodynamic load coefficients and turbulent wind velocities. Using random maximum displacements and base-bending moments as engineering demand parameters, the convolution of fragility functions with hazard curves for three intensity measures (maximum tangential velocity, core radius of the simulated tornado, and starting location of the tornado) yield probabilities of structural failure for selected limit states. The shapes of the integrand probability surfaces and the subsequent estimations of relative costs exhibit significant differences among the five models despite the parametrically equivalent simulations. This initial study, though limited through its case analysis of a point-like (monopole) structure, sets the stage for future investigations of life-cycle costs for other vertical structures (e.g., tall buildings) subjected to tornadic wind loads.