Design of timber structures
Structural design involves choosing the dimensions of load-bearing members and modelling the load-bearing structure with regard to the requirements set for material resistance, performance and durability during the service life of the structure.
Structural design is based on verification. The aim of this verification is to show that the actual requirements are fulfilled for the chosen material, dimensions and structural system. This verification can be achieved by calculation or testing, or by a combination of the two.
The design working life is the period for which it is assumed a structure is going to be used for its intended purpose, with anticipated maintenance but without major repair being necessary. A design working life of 50 years for buildings and 100 years for bridges is often recommended.
The life of a building project, irrespective of whether it is a house, industrial site or part of an infrastructure such as a bridge, can be divided into different phases, see Figure 1.1. These phases include design, construction, use of a building (working life) including maintenance and repairs and, finally, at the end of working life of a structure, demolition.
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