Structural Modelling of Support Scaffold Systems (No. R896)

Abstract

In this report, accurate three-dimensional advanced analysis models are developed to capture the behaviour of support scaffold systems, as observed in full-scale subassembly tests consisting of three-by-three bay scaffold systems with combinations of various lift heights, number of lifts and jack extensions. The paper proposes methods for modelling spigot joints, semi-rigid upright-to-beam connections and base plate eccentricities. Material nonlinearity is taken into account in the models based on the Ramberg-Osgood expression fitted to available experimental data. Actual initial geometric imperfections including member out-ofstraightness and storey out-of-plumb are also incorporated in the models. The ultimate loads from the nonlinear analyses were calibrated against failure loads and load-deflection responses obtained from full-scale subassembly tests. The numerical results show very good agreement with tests, indicating that it is possible to accurately predict the behaviour and strength of highly complex support scaffold systems using material and geometric nonlinear analysis. The report is a milestone in the ongoing development of a design methodology for support scaffold systems based on advanced analysis currently undertaken at the University of Sydney.