Outline of Draft Amendment A to EN

At the time of publication of the book a Draft Amendment A1 to Eurocode 5: Design of structures. Part 1-1 is being processed. An outline of the proposed changes being considered, which, if approved, will be relevant to the content of this book, is given below. Where an amendment will result in a change to the design procedure described in the book, reference is made to the draft proposal in the text.

The draft amendments are given against the section number used in EC5 and those that, if approved, will result in a change to the relevant item in the book are as follows:

6.1.5 Compression perpendicular to the grain

The content of 6.1.5 will be effectively deleted and replaced by a new procedure.

When a member is loaded perpendicular to the grain by a design load Fcj90jd the bearing stress will be derived at the plane of contact between the load and the member and the design compressive stress perpendicular to the grain at this location, ac>90jd, will be:

Fc 90 d ac,90,d = —(C3.1) Aef where Aef is referred to as the 'effective contact area perpendicular to the grain'. The area is obtained by multiplying the contact zone width by an 'effective contact length'. The effective contact length can be the actual contact length, I, as indicated in Figure C1, or may be derived by adding 30 mm to each end of the actual contact length but not more than a or I, where these dimensions are as indicated in Figure C1. The validation requirement will be:

where:

• kc,90 remains as defined in EC5 but the method of evaluating a value for the factor will be changed. The value should be taken to be 1, however for the bearing conditions shown in Figure C1, when l1 > 2h, where h is the depth of the member, a higher value can be used for solid softwood timber and glued laminated timber members as given in Table C1.

• fc,90.d is the design compressive strength of the member perpendicular to the grain and will be derived as defined in 4.5.3.

Table C1 Value of kc>90 for solid timber and glued laminated timber members subjected to compression perpendicular to the grain
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