Author: A. Khan and R. Dixon (Swanton Consulting)
1 February 2018
A. Khan and R. Dixon (Swanton Consulting)
Hoarding can be erected using a modular system or be a bespoke installation. It can be made using a wide range of materials, such as steel, timber or plywood, which may be re-useable or disposed of after use. Hoarding can incorporate barriers, gates and viewing windows, and may be used to display warning and information signs.
This article provides an introduction to the design of conventional timber hoardings using plywood sheets.
The design of timber posts follows the same principles as the design of vertical structural elements formed from other materials. Extreme fibre stresses or buckling due to applied axial forces are the key components affecting a post’s ability to perform. The major difference is the anisotropic nature of timber, which, for vertical elements, has a significant impact on the assessment of their performance as a structural member.
Current highway bridge designs in the UK tend to favour either composite steel girders with a precast or in situ concrete deck for long spans, or precast concrete beams with an in situ concrete deck for spans of less than 40m. This article considers temporary works, in particular the use of temporary supports, to precast concrete bridge beams during deck construction.
Last month’s article in the series covered the theory and detailed methods recommended for calculating backpropping loads. This article continues by discussing some of the design issues and preconceptions related to backpropping, and gives worked examples.