Design Considerations

Glued laminated members can function as beams or columns or members subjected to combined bending and axial loading, and the limit states associated with the main design effects are given in Table 6.1. The general comments in 4.2 and 5.2 are also applicable to glued laminated elements.

The production requirements of glulam must comply with the requirements of BS EN 386:2001 [2] and the design procedure used is dependent on whether the member is constructed using laminations of the same grade and species (homogeneous glulam) or formed with inner and outer laminations of different grades and species (combined glulam). The requirements for each type are discussed in 6.3.

(c) Sloped columns (photo courtesy of APA, The Engineered (d) Curved portals (photo courtesy of APA, The Engineered Wood Association) Wood Association)

(e) Portal frame (photo courtesy of Constructional Timber (f) A roof structure (photo courtesy of Lilleheden Ltd,

Ltd, a member of the Glued Laminated Timber Association, UK) a member of the Glued Laminated Timber Association, UK)

Fig. 6.1. Examples of glued laminated structures.

(g) Footbridge (photo courtesy of Engineered Wood Products (h) Curved columns Association of Australasia (EWPAA))

Fig. 6.1. Examples of glued laminated structures.

Table 6.1 Main design requirements for glued laminated members and the associated EC5 limit states

Element

Design or displacement effect

EC5 limit states

Beam members

As Table 4.1

As Table 4.1

Columns

As Table 5.1

As Table 5.1

(a) Horizontal glulam (b) Vertical glulam cross-section cross-section

(a) Horizontal glulam (b) Vertical glulam cross-section cross-section

Fig. 6.2. Horizontal and vertical glulam.

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