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 Adam Crewe posted on Sunday, May 17, 2009 - 04:42 pm
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Do we have to do stress and displacement calculations for the building?
No. We are only looking for a conceptual design. You need to think through the types of loading that the building will be subjected to and the structural elements required to carry the resulting forces.
You can do some basic calculations if you wish, but we also recommend that you build and test some trial models. To find out how you can test your model, see
http://www.ideers.bris.ac.uk/comp/model_test.html |
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| Adam Crewe posted on Sunday, May 17, 2009 - 04:47 pm
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What are the properties of MDF?
We do not know the exact properties of the MDF that will be used for the challenge in your country. The density and modulus of elasticity for MDF can vary, and you can find typical values from an internet search. Typical ranges for these properties are:
Density 680–830 kg/m3
Modulus of Elasticity 2.5 GPa -5.0 GPa
You do not need to do detailed calculations for this challenge. Approximate calculations will be enough. It is more important that you get concepts of the design correct and that you construct your model well. |
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Do we need to design the foundations for the building?
No. For this challenge, we are only interested in the structure above the ground, so you will not get any additional credit for including any design of the foundations. Concentrate on the main structure as this is what will be tested in the final when the models are subjected to the earthquakes on the shaking-table. |
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| Adam Crewe posted on Monday, June 15, 2009 - 09:32 am
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What are the properties of the string?
The string for the competition in Korea is about 3mm in diameter and is made from cotton. This means it will be quite strong but that it is possible to snap it under extreme loading. Cotton string is generally less stretchy than nylon string but it carries a lower maximum load (for the same diameter). |
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Can we use string from the edges of the MDF base board to the model?
You can use string ONLY from the corners of the baseboard and attach it to any part of the structure; and
you MUST leave space for the clamps to be attached.
Below is a picture showing an example of how a model can be fixed to the shaking-table
Also, you can drill some of the permitted holes (see Rule 4 for the Structure) in the corners of the baseboard, so that you can tie the string to the base board.
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Do we have to use paper to cover each floor as shown in the example figures in the "Specification for the Model Building?"
You do not have to use paper across each floor. However, you can use it as diaphragm which will add torsional stiffness to your building.
See http://www.ideers.bris.ac.uk/resistant/strength_diaphrams.html |
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