Example 9.7.7 The lateral resistance of a timber structure is to be provided by timber stud walls faced on the outer side with 9 mm thick oriented strand board (OSB) to BS EN 123691:2001 and on the inner face with plasterboard. The wall is 2.4 m high and the ground floor wall assembly with its associated characteristic permanent vertical loading (including the self-weight of the wall) is shown in Figure E9.7.4. The environment in the building is equivalent to service class 2 conditions.

a) Calculate the design resistance of the wall assembly to wind loading and the anchorage forces to be provided by each wall.

b) What is the racking resistance of wall 1 if the uniformly distributed loading along the top of the wall is replaced by a characteristic permanent point load at mid-length with a design value of 22.8 kN?

The studs are 47 mm wide by 100 mm deep, strength class C16 timber to BS EN 338:2003; the lateral design capacity of each 3 mm diameter round nail fixing used for the OSB to the studding is 397 N; the perimeter spacing of each fixing is 50 mm c/c with the fixings to intermediate studs at 100 mm c/c; 3 mm diameter round nail connectors are used to connect the end studs of each adjacent wall panel and these have a design capacity of 440 N. The plates at the top and bottom of the studs are 100 mm wide by 50 mm deep strength class C16 timber. Each wall is made from three wall panels and the wall assembly comprises wall 1 and wall

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