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Assignment 2 – Timber brace design, steel brackets and dowelled connections
Due date – 20th May 2024
Scope
A multi-storey timber building is to be built in Tauranga. The lateral load resisting system consist of timber braces with Tectonus Resilient Brace Assemblies (RBA) for ductility (see Figure 1 for concept). The RBA is fastened to a steel bracket that connects it to the timber brace.
As this is still at concept stage, the timber brace can be designed using either Radiata pine glulam (Grade 12) or LVL Grade 13. Two brace configurations are to be investigated.
Required
For the 2 brace configurations, you are to:
1. Design the brace (size, material, etc … );
2. Design the dowelled connection between the timber brace and the steel bracket (number of dowels, diameter, spacings, number of shear planes, etc … );
3. Design the steel bracket that will transfer the force between the RBA and the dowelled connection (number and size of plates, dimensions, welds size and grades, etc … ).
Information:
|
Information |
Brace 1 |
Brace 2 |
|
Maximum tension force (kN) |
1000 |
1500 |
|
Maximum Compression force (kN) |
1200 |
1750 |
|
Bolts between RBA and steel bracket |
8 – M24 Gr 8.8 |
8 – M30 Gr 8.8 |
|
Brace length (pin-to-pin) (m) |
5.5 |
5.5 |
Rubric:
Refer to the general rubric for this course. Make sure you identify all members, their maximum forces and the connection locations.
From your submission, a draftperson should be able
to make a detailed structural drawing.
1. Make any assumption if information is missing and verify your assumption at the end.
2. Steel plates 350 MPa yield strength.
3. Use the Detailed Method to design the dowelled connections.
4. Submit your EXCEL spreadsheet with the PDF file of your assignment submission.
Fig. 1. Timber brace with Tectonus Resilient Brace Assembly. 1. RBA. 2. Steel bracket. 3 Dowelled connection. 4. Timber brace.
