Posts By: Mark Evernden
Correct SFD is D: Check out http://expeditionworkshed.org/applets/2D_frames/sketch_10/sketch_10.html for a great pushmepullme model of the problem.
Thanks to Al form supplying the answer
Would you like a quick revision of simple hanging cables? CLICK HERE
If the cable has a diameter of 24mm what is the maximum stress in the cable?
The correct answer is approx 676N/mm2, if you got it wrong please check out the full SOLUTION
For the structure shown below calculate the position of the roller support from the free end of the beam (C) such that the moment at the fixed end (A) is zero kNm.
If you didnt get it right or were unsure of the BMD or deflected shape check out this SOLUTION
After the maths of last week's question, here is something to make your brain work in a slightly different way!
UPDATE: Its about real world design and the implications of inaccuracies in construction.
A person weighing 600N sits on a three-legged stool. For what basic force should each leg be designed? There is no catch to this problem - the stool is to be symmetrical, the person sits in the center of the seat. The answer is of course 200N
The same person now sits on a square stool with four legs, one at each corner and again the stool and the loading are symmetrical. For what force should each leg of the stool be designed?
You can assume the floor is flat and rigid! Once you have decided how much load each leg should be designed for, please answer the question below.
Which type of stool uses the least amount of material in the design of each leg?
Voting is now closed!
Well done to the 62 people that entered the quiz. If you consider that the length of each leg maybe very slightly different, then the 3 legged stool is by far the best design requiring 50% of the material in the legs than the 4 legged stool.
If you didn’t get this answer please read through the SOLUTION.
Something a bit harder this week to keep you all on your toes!
What diameter of steel cable is required such that the mid-span deflection of the timber beam is only 50% of the mid-span deflection of the beam without the cable?
Click the link below for the solution-->
Match each Shear Force Diagram (SFD- red) with a Bending Moment Diagram (BMD-blue).
Hint: BMDs are drawn on the tension side of the deflected shape.
No calculations this week! Which BMD matches the load-case for the structure shown below ?
Choose from the following
Write your answer to one decimal place and in units of kNm
Congratulations to Barrie Dams you've won some chocolates!
Tim Ibell, Antony Darby, Charlie Banthorpe, Natasha Watson and Ze Wen also got it right!
The answer is 8.4kNm, click on the link below for a worked solution.
Okay here goes, our first trial question. Get your pens ready ...GO
The largest BM felt by this Virendeel truss is approximately:
A. 10 kNm in BE
B. 5 kNm in AD
C. 40 kNm in BC
D. 20 kNm in EF
Submit your answers to firstname.lastname@example.org
A solution will be posted early next week. Good luck!