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Can anybody tell me if my calculations for the questions are correct? If not can you show me how you would work it out.
Much appreciated if someone can help me asap.
Thanks
Much appreciated if someone can help me asap.
Thanks
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(Original post by Smack)
Cordero31 I think you have made a mistake in calculating your shear forces: you seem to have not included the UDL.
Cordero31 I think you have made a mistake in calculating your shear forces: you seem to have not included the UDL.
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#4
(Original post by Cordero31)
I thought so, but I'm confused on how to include it in my calculations. Would you be able to help me? I've looked online for guides but still no help to me as I don't quite understand it.
I thought so, but I'm confused on how to include it in my calculations. Would you be able to help me? I've looked online for guides but still no help to me as I don't quite understand it.
I found this:
http://www.engineeringintro.com/mech...upported-beam/
May be helpful. Remember that for a UDL the SF diagram won't be flat like with a point load, the the BMD will be curved where the UDL is. For working out reaction forces I think you can consider the UDL to be a point load, where the weight is concentrated in the centre of the UDL, and weighs the same as the entire UDL.
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(Original post by Smack)
I'm not really that familiar with how to explain it, sorry, but I would encourage you ask your lecturer or keep looking on the net.
I found this:
http://www.engineeringintro.com/mech...upported-beam/
May be helpful. Remember that for a UDL the SF diagram won't be flat like with a point load, the the BMD will be curved where the UDL is. For working out reaction forces I think you can consider the UDL to be a point load, where the weight is concentrated in the centre of the UDL, and weighs the same as the entire UDL.
I'm not really that familiar with how to explain it, sorry, but I would encourage you ask your lecturer or keep looking on the net.
I found this:
http://www.engineeringintro.com/mech...upported-beam/
May be helpful. Remember that for a UDL the SF diagram won't be flat like with a point load, the the BMD will be curved where the UDL is. For working out reaction forces I think you can consider the UDL to be a point load, where the weight is concentrated in the centre of the UDL, and weighs the same as the entire UDL.
Any one else have any suggestions on how to use it? Much appreciated ! really stuck on this and how to draw the shear force diagram and the bending moments >.<
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#6
(Original post by Cordero31)
...
...
Since you know all the reactions, you can do a shear force and bending moment equilibrium to obtain an expression for the shear force and bending moment strictly valid for that segment only. So very importantly, your expressions for the shear force and bending moment distribution will be piecewise continuous.
Then repeat for the other three segments.
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#7
(Original post by Cordero31)
I've tried looking at that but still completely stuck on how to include the UDL. thank you tho!
Any one else have any suggestions on how to use it? Much appreciated ! really stuck on this and how to draw the shear force diagram and the bending moments >.<
I've tried looking at that but still completely stuck on how to include the UDL. thank you tho!
Any one else have any suggestions on how to use it? Much appreciated ! really stuck on this and how to draw the shear force diagram and the bending moments >.<
Remember that a UDL can be represented by a single force acting at the centroid of that section. Don't forget to multiply that force magnitude by the total length leading up to that section of the beam.
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#8
(Original post by Cordero31)
I've tried looking at that but still completely stuck on how to include the UDL. thank you tho!
Any one else have any suggestions on how to use it? Much appreciated ! really stuck on this and how to draw the shear force diagram and the bending moments >.<
I've tried looking at that but still completely stuck on how to include the UDL. thank you tho!
Any one else have any suggestions on how to use it? Much appreciated ! really stuck on this and how to draw the shear force diagram and the bending moments >.<
Transferring that UDL to the bending moment diagram means calculating the area between the slope and the zero line just like the other sections. However as other folk have said, the UDL is a steady curved line on a bending moment diagram
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#9
(Original post by Cordero31)
I thought so, but I'm confused on how to include it in my calculations. Would you be able to help me? I've looked online for guides but still no help to me as I don't quite understand it.
I thought so, but I'm confused on how to include it in my calculations. Would you be able to help me? I've looked online for guides but still no help to me as I don't quite understand it.
Knocked up a quick shear force diagram there.
Just realised now how pointless this reply is cos of age of the post hahahha. Hope you're having better luck, I'm 1st year HND at nescol at the moment and I've only just started getting decent at statics lol. the only thing im not 100% on with this 1 is the 8kN force on the end there, but the maths and the diagram works out so......
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