Influence of dynamic properties on scaffoldings safety

Abstract Scaffoldings are used for works at height and in places that hard to reach, which makes such dangerous employees accidents occur frequently. Loads generated by scaffolding users cannot be avoided. Moving workers excite low-frequency (1–2 Hz) vibrations scaffoldings as slender structures prone dynamic action. The method determining the probability of excitation is presented here. quantity representing this called predictor occurrence a situation due induced walking employee. resonance with i th natural frequency requires an analysis behavior. frequencies mode shapes were determined. Numerical simulations worker's movement on penultimate decks two carried out, well. Predictor was made single combinations pairs. values calculated first or it highest ones, however not only affected frequency. To improve safety, should increased. For longitudinal vibrations, can done adding more bracing reducing lengths anchors. Increasing number anchors gives good results both directions. During design typical atypical constructions, one must determine then, if less than 4.0 Hz, perform analysis.