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# Btec Level 3 Construction and the built environment help

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1. I am currently undertaking a btec level 3 in construction and the built environment. It involves a lot of maths and science which I aren't too good at although I passed both at gcse.

I am struggling on unit 48 if anyone has any experience of doing this or could help me with my assignments? I have attached them to this post.

Any help will be much appreciated
Attached Files
2. Unit 48 - Ass 2..docx (792.3 KB, 18 views)
3. Can't read attachment and it won't open,what's the math/science question?
4. (Original post by TSRPAV)
Can't read attachment and it won't open,what's the math/science question?
"A simply supported reinforced concrete beam is to span 3.8m carrying auniform load of 70kN (inclusive of self-weight). The beam is to be 160mm wide.Assume the 70kN consist of 60% dead load and 40% live load."
Determine the following using limit state design method for the ultimatelimit state.
• A suitable effective depth
• Overall depth
• Area of steel
• Then draw afully-annotated sketch of the cross-section of the beam.
5. So I've never done anything like this before as I've only done a level subjects so this is beyond me aha but I guess the 60% dead load you can use as a constant force of 42kN (weight) acting on the beam and I've just looked up what live load means and its temperary load from what I understand e.g people walking on bridges this means that it should be treated as force per area (pressure) which can vary. Guessing in this scenario 40% live load implies that 28kN of force (in weight) is on this beam. So 3.8m*0.16m (160mm) = 0.608 or 0.61 (2.d.p) meters squared of area. So as pressure is force/area then there is a pressure of 28E3 / 0.608 = 46052.63... = 46053 Nm^-2 (5.S.F) so I guess you now have the weight and pressure that the beam can support (46053 Nm^-2 or pascals). Find out the details of how much pressure concrete can withstand and base your arguments on that? Cos you got to make it so the it can hold the live load but not buckle under its own weight. I literally have no idea so sorry ahah but I had a go at learning something new.

I'm just guessing but useful equations could be..

Density = mass/volume
Pressure=force/area
Weight=force=mass*acceleration(o r rate of change of momentum)= mass of object *9.81 on earth
7. Ok now stuff posts? Wtf

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