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# mudzm10 - Muddy Card Responses Lecture M10 Why is the...

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Muddy Card Responses Lecture M10 Why is the answer 5? (with reference to the last pair of PRS questions) I don’t understand how there can be no displacement. Admittedly the idea of the pins sitting on rigid supports is an idealization (nothing can be perfectly rigid), but given that the supports are rigid, the bar is prevented from extending or contracting axially. FL Are there any other constitutive laws for bars besides: d = + a D TL ? We will meet AE some other constitutive laws later this term, and next term. However, this one is the most useful for the bars in trusses. Could you put the concept questions on the web?. Certainly. What is superposition? I like colored chalk. I am glad you like the chalk - I hope that it clarifies things. Superposition refers to the idea that we can break down complicated loading and or support conditions to a linear combination of simpler ones. This is due to the fact that the structures are linear and elastic. Displacement diagrams are just greatly scaled ways of demonstrating how the joints move, is that correct? . Yes. Do they really move like that or is it just a theoretical representation, or do they really move like that but on a much smaller scale? The second. Trusses such as the one you have tested in the truss lab are quite stiff, so the deflections are small. The displacements are measured in mm while the bar lengths are 0.5-1 m. This means that the deflections and displacements are very small. However, a truss that conforms to the pin-jointed model, will really deform in this way. Superposition. I don’t quite understand what you were talking about, but I imagine you will cover it further later on. We will indeed meet superposition on several occasions in the future. I brought it up today because some people find it easier to think about statically

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mudzm10 - Muddy Card Responses Lecture M10 Why is the...

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