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CIV1501, S3, 2011 Assignment Questions Due: 11.55pm 31st

August 2012

This is the third assessment item due for CIV1501, semester 2, 2012. Rev 3

Due Date: 11.55pm 31st August 2012

Total Marks: 150 marks

Assignment completion instructions:

Ensure that you:

Attempt as many questions as possible. Write clearly and set out your work in a tidy and professional manner, illegible or badly set out

work will not be marked.

o Set out your working so that it is clear from where your numbers have been derived andwhy you are undertaking each step (E.g. using statements such as Fx = 0; asappropriate), this is modelled throughout the textbook.

o Clearly differentiate between vectors and scalars in your working, using the notationdiscussed in your studybook, Module 2.

Start a new page of working for each question. Draw a free body diagram at the start of your working for each question. You must include and

label all known and unknown forces, axes and relevant dimensions or geometry. (Refer to

Chapter 5.2-5.3 of the text.) This is an important part of your problem solution, you should alsoinclude additional diagrams if necessary to clarify your working method.

Report all answers to three significant figures; carry a minimum of four significant figuresthrough your calculations.

Show the correct units with your final answer(s). Clearly identify all final answers requested in the question by summarising them at the end of

your working for the question.

Use the methods and notation in the solution of problems that are consistent with the relevantsections of the course material, otherwise the question may not be marked.

Handwritten calculations and diagrams must be produced and submitted for marking.

Questions follow the course material that is presented in the studybook and textbook. It is stronglyrecommended that you complete your study of the relevant section of course material, includingsufficient Activity questions and online tutorial questions, prior to attempting the assignment questions.

Assignment Submission

You must submit your original working to the examiner for marking via the Assignment Submission Boxprovided on the course studydesk site (Assessment Area).

Signed Assignment coversheets must be included as the first page of your assignment. You will need todownload the coversheet through your UConnect Student centre, print it and sign it.

You must retain a copy of your submitted working for your own reference and be able to produce it ifrequested by the examiner.

Working submitted for marking must be clear and easily legible or it may not be marked.

Students Own Work

All assessable work in this course is to be the individual students own work. It is unacceptable forstudents to share solutions to assessable work in any manner. Violations of this principle are regarded asAcademic Misconduct and will be dealt with under the USQ Academic Regulations.

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CIV1501, S3, 2011 Assignment Questions Due: 11.55pm 31st

August 2012

Question 1 15 marks

Before attempting this question you should complete your study up to and including Module 2.

Three cables exert forces on a bracket as shown.

(i) If the resultant of the forces has a magnitude of 400N and a line of action along theaa axis find the magnitude and direction, , of force, F3, in the third cable.

(ii) Sketch the arrangement of the three applied forces relative tox-y coordinate axes.(iii) Write the three applied forces in Cartesian form.

Question 2 20 marks

Before attempting this question you should complete your study up to and including Module 2.

A pre-cast concrete slab weighing 200kN is lifted by means of three chains connected by a

smooth ring at A. If pointA is directly above the centre of gravity G of the slab determine the

tension in all three chains.

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CIV1501, S3, 2011 Assignment Questions Due: 11.55pm 31st

August 2012

Question 3 15 marks

Before attempting this question you should complete your study up to and including Module 2.

Find the resultant force acting at point D and write it in Cartesian form. (Note that CD is parallel

to they-axis, the 40N force acts parallel to thez-axis and the 30N force is parallel to thex-axis.)Find the magnitude of the projected component of the resultant force acting along the lineAD.

Question 4 15 marks

Before attempting this question you should complete your study up to and including Module 3.

Find the tension in the three weightless chains (AC,BC& CD) and the springDEthat support

the loads shown. Find the un-stretched length ofDEifk= 150 kN/m.

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CIV1501, S3, 2011 Assignment Questions Due: 11.55pm 31st

August 2012

Question 5 10 marks

Before attempting this question you should complete your study up to and including Module 4.

One fork of the lifting assembly of a garbage truck which empties industrial waste bins is shown.

If the bin exerts a force of 10kN on the fork, the weight of memberABCis 3kN acting at pointBand the weights of the other members can be neglected, calculate the reactions at the pin at A

and the force in the hydraulic cylinderBD. Assume all pins are smooth.

Question 6 15 marks

Before attempting this question you should complete your study up to and including Module 4.

Determine the magnitude of the moment of the force F about the baseline CA of the tripod

ABCD, ifF = {40i -30j -100k}N.

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CIV1501, S3, 2011 Assignment Questions Due: 11.55pm 31st

August 2012

Question 7 15 marks

Before attempting this question you should complete your study up to and including Module 5.

A reinforced concrete footing is to support the three column loads shown. If the resultant is a

force of 3500kN acting through the centre of the footing, determine the load applied to the slabby the third column and its locationx andy.

Question 8 15 marksBefore attempting this question you should complete your study up to and including Module 5.

A reinforced concrete retaining wall I subjected to the soil pressures shown. Determine the

equivalent resultant force on the wall, FR, and locate its line of action horizontally with respect

to the toe of the footing A. Sketch the resultant force acting at the base of the footing.

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CIV1501, S3, 2011 Assignment Questions Due: 11.55pm 31st

August 2012

Question 9 15 marks

Before attempting this question you should complete your study up to and including Module 6.

A shaft is supported by two smooth, correctly aligned bearings atA andD. Determine the

reactions at each of the bearings. Neglect the weight of the shaft and its pulleys.

Question 10 15 marks

Before attempting this question you should complete your study up to and including Module 6.

A small truck mounted crane lifts a pallet of bricks weighing 10kN. Calculate the magnitude of

the compressive force in the hydraulic cylinderACif the crane is in equilibrium.