Author: C. O'Regan (AECOM)
2 October 2017
Members/Subscribers, log in to access
An IStructE account gives you access to a world of knowledge. Create a profile to receive details of our unique range of resources, events and training.
C. O'Regan (AECOM)
This Technical Guidance Note introduces structural engineers to the interfaces between a primary structure that is principally formed from steelwork and a masonry cladding system.
Thin panels of masonry in large buildings, or cavity wall skins, require additional horizontal support to make them stable. The element that provides this support is a vertical prop known as a ‘windpost’. Its principal role is to provide lateral support against destabilising horizontal forces that typically originate from wind pressure – hence, the name. Windposts are typically steel elements – either open sections, such as channels or angles, or closed sections, such as rolled hollow rectangular sections. This Technical Guidance Note provides guidance on the design and detailing of windposts relating to their incorporation into building structures.
This Technical Guidance Note aims to clarify the term 'simple connection' by explaining its use when designing connections within steel frames. Additionally, guidance is offered on different types of simple connection and the design checks that need to be carried out.
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. The design of timber elements in the UK, according to current codes of practice, is based on limit state theory. This Technical Guidance Note adopts this approach to describe the design of timber posts. The note assumes that the reader is familiar with the use of coefficient factors prevalent within BS EN 1995-1-1 (Eurocode 5), as described in Technical Guidance Notes Level 1, No. 18 Design of timber floor joists and Level 2, No. 14 Design of unrestrained timber beams.