Ultimate Load Capacity Analysis of Steel Scaffoldings Using Direct-Analysis Method

Abstract

For ensuring the safe load capacity of steel scaffoldings, the ultimate load capacity analysis is performed including an experimental test and numerical modeling. The test is relatively costly; therefore, it is used specifically for small configurations. Then, the parametric methods based on the calibrated numerical modeling are used. The ultimate strength analysis of steel structure requires a sophisticated nonlinear inelastic computer analysis and cumbersome procedure. As an alternative, elastic second-order computer analysis and the direct analysis method (DAM) are tried. The loading is given incrementally, and at each stage the available strengths and required strengths are evaluated. The ultimate limit load is considered achieved when the available capacity in the critical member equals that required. It has been proven that the calibrated DAM can be used to trace the ultimate load well. It can even be used to evaluate the effectiveness of bracing or lateral support placements. It is important especially for multistory steel scaffoldings that belong to sway frames because their strengths are significantly influenced by the stability issues.