Design a Timber Deck - Cross-Sectional Dimensions - Engineering Assignment Help

Assignment Task :

Task 1: Timber design  
You are tasked to design a timber deck which will be used as an open dining space (with tables and chairs — not fixed) for the public at the back of a two-level restaurant building in Toowoomba, Queensland. Wheeled vehicle access is not available. The deck is 4*X m long, 2*Y m wide and 2.5 m off the ground. Handrails are used along in all edges of the deck except the side to the building which is intended for entry. 
The timber deck is supported by a typical system of joists

• bearers
• posts
• hangers.

Joists support the flooring and span continuously over the three bearers. Bearers carry the loads from the joists and each bearer is supported by four posts and one wall hanger. 
 

1. Design Information

1.1. Common design information

• Floor sheeting is 22 mm thick and nailed at 300mm centres.

• Handrail has unit mass of 12 kg/m

• Cross-sectional dimensions of joists are 50 mm x 160 mm (see 1.2 for spacing)

• Cross-sectional dimensions for bearers are 75 mm x 250 mm

• Cross-sectional dimensions of post are 200 mm x 200 mm

• Imposed action: refer Table 3.1 of AS 1170.1 (distributed only - ignore concentrated action)

• Long term deflection limit for both floor joist and bearer: span/300

• Short term deflection limit:

(i) floor joist: span/300;

(ii) bearer: span/250 
 

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