Introduction

The use of glued laminated members (glulam) for structural purposes offers the advantages of excellent strength and stiffness to weight ratio, can be designed to have a substantial fire resistance, and can achieve a high standard of architectural finish. Some examples of glued laminated structures are shown in Figure 6.1. A summary of some of the main advantages of glulam members is as follows:

(a) As glulam sections are built up from thin members it is possible to manufacture complicated shapes. They can be produced in any size, length and shape. Manufacturing and transportation facilities remain as the only practical limiting factors affecting dimensions.

(b) The use of a number of laminates results in a more even distribution of defects throughout the section, reducing the variability and generally increasing the strength of the timber.

(c) Pre-cambers can easily be incorporated into the section during the manufacturing process.

In this chapter, the design procedure is given for glued laminated timber members designed in accordance with the requirements of EC5 [1]. The particular requirements of curved members, tapered members and pitched cambered members functioning as beams are addressed, noting that the methodology used will also apply to members manufactured from laminated veneer lumber (LVL).

The general information in 4.3 is relevant to the content of this chapter.

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