Einfluß der Simulation des natürlichen Windes auf die Prognose des Überlastrisikos von Hallentragwerken

Influence of the simulation of the natural wind on the overload risk of low-rise steel-frame buildings The present work investigates the influence of the simulation of atmospheric wind on the prediction of the overload risk on low-rise steel-frame building structures. The analysis is based on time series of external pressure fluctuations along the centre-bay of a typical low-rise industrial building. The time series have been recorded in wind tunnel tests at six different European wind tunnel laboratories participating in a unique comparative study. Two aspects have been of main interest: the variation of the geometric scale by using different model sizes of identical geometry and the variation of the atmospheric wind simulation in the tests. To avoid any biasing influence from using different equipment at the respective laboratories the entire measurement equipment used at the home laboratory was transported to each of the participating laboratories. The analysis focuses on both the flow-induced aerodynamic action (load process) and the action effects (response process). The characteristic of the aerodynamic action is described through statistical analysis of the load process. With a sufficiently high number of measurement repetitions of each tested configuration a large data base has been collected allowing for a statistically stable assessment of the stochastic parameters. The action effects are calculated on an FE-model of the main steel frame at centre-bay allowing for considering geometric imperfections and non-linearity in structure and material. Varying the static system allows for further investigation of how the overload risk is affected by the boundary conditions of the wind load simulation.