As stated in 4.3, to be able to verify the ultimate and serviceability limit states, each design effect has to be checked and for each effect the largest value caused by the relevant combination of actions must be used.

However, to ensure that attention is primarily focussed on the EC5 design rules for the timber or wood product being used, only the design load case producing the largest design effect has generally been given or evaluated in the following examples.

Example 5.7.1 The column shown in Figure E5.7.1 has a cross-section 150 mm x 200 mm, is of strength class C18 to BS EN 338:2003, and functions under service class 2 conditions. It supports a characteristic permanent compressive axial action (including its self-weight) of 30 kN and a characteristic variable medium-term compressive axial action of 50 kN. The column is 3.75 m high and at each end is effectively held in position but not in direction about the z-z and the y-y axes.

Check that the column will meet the ultimate limit state (ULS) requirements of EC5.

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