Abstract
The purpose of this paper is to show the influence of incorrect scaffolding foundations on the stress in their elements. Static stress analysis was performed for exemplary steel façade scaffolding. The scaffolding was formed using the Plettac 70 system and was composed of 16 modules and 13 working levels. The total dimensions of the scaffolding were 45.0 × 26.36 × 0.74 m. The scaffolding was set up partly on concrete and partly on a created ground classified as coarse sand with discontinuous graining. The boundary conditions modelling the foundation considered the heterogeneity of the ground both along the scaffolding and in the direction perpendicular to the façade. The effect of uneven subsidence on the scaffolding frames was checked, adopting a constant stiffness of 3500 kN/m in half of the supports, while in the rest of them the stiffness varied from 35 to 3500 kN/m. Due to additional bending moments, normal stresses in stands and transoms of the frames increased. Incorrect scaffolding foundation has the greatest negative effect on normal forces in anchors and bracings. Because these elements are responsible for the stability of the scaffolding, their damage may result in scaffolding failure and would certainly lead to a reduction of the values of free vibration frequencies, thus resulting in the discomfort of the workers on the scaffolding and a lack of safety.
Highlights
The majority of construction sites use scaffolding for work at a certain height and in places difficult to access
The results of the tests conducted at the construction site showed that the scaffolding foundation was incorrect
Further information about behavior of the scaffolding in real conditions at the construction site were obtained based on computer calculations of the scaffolding in the C1 configuration
Summary
The majority of construction sites use scaffolding for work at a certain height and in places difficult to access. Even though scaffolding is a temporary structure, it is one of the most important parts of the work safety organization at construction sites. Height of the scaffolding, objects occurring in its immediate vicinity [6], as well as on safety nets and claddings [7] attached to the scaffolding, because the main impact on the forces in anchors is caused by the wind [8]. Another aspect affecting the anchoring stress in inaccuracies in the structure’s geometry (imperfections) [9]. There is a lack of research in the literature containing information about scaffolding, foundations which clearly have significant impact on the stress in scaffolding elements and safety of the whole structure
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