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CIVE3013 Steel and Timber Design

ONLINE EXAMINATION CIVE3013 Steel and Timber Design (SP2-2020)

Examination Duration:

240 minutes (including 1 hour for uploading)

Instructions to Students: 1. This exam is open book. 2. Answer all questions 3. Ensure that you show all calculations in all parts of each question 4. When uploading your exam file, make sure that you include all pages in the correct order. Only 1 file will be allowed in a PDF or .doc format.

ONLINE EXAM SUPPORT: IT Helpdesk: If you experience any technical issues while completing your exam, contact the IT Helpdesk, this may include internet connection issues or computer performance which has impacted on your ability to complete your exam. Please note the specific details of the technical issue, including time and any screen shots or other evidence to support your request. IT Helpdesk can be contacted on: • Local: (08) 8302 5000 • Interstate & Country: 1300 558 654 (cost of a local call) • International: (+61 8) 8302 5000 (we can call you back to minimise your call costs) Please do not hang up even if you are on hold as a service ticket will be raised once the call is answered. This service ticket will be your evidence of an issue occurring. Course Coordinator: If you require clarification of any question in the exam, you should contact your Course Coordinator via email. This can occur during the first 60 minutes of the exam period.

Page 1 of 12

CIVE3013 Steel and Timber Design

Question 1 (Answer ALL Parts) 1.1 Describe the main steps of making steel from raw material to finished steel

products include one type of furnace used. (4 marks) 1.2 What is a ‘fly-brace’ and where is it used? What function does it perform?

(4 marks) 1.3 What is ‘Glulam’ and are the laminations normally vertical or horizontal?

(4 marks) 1.4 Name four (4) different types of engineered timber.

(4 marks) 1.5 Name 2 different ways to connect two pieces of timber. Will any of these

affect the tension capacity of the timber being connected? (4 marks) Total = 20 marks

Page 2 of 12

CIVE3013 Steel and Timber Design

Question 2 You have been asked to design a NEW timber roof truss for a hotel in Darwin, Northern Territory. The truss has the configuration in the figure below (element DB is perpendicular to AB and BC):

The roof truss needs to carry the following roof load, P (point load): • Dead Load PG (kN) (unfactored) • Live Load PQ (kN) (unfactored) Note*: Please find truss dimension H(mm), L(mm), load PG (kN) and PQ (kN) from attached Variables Table based on your student ID number (see at the end of the exam). 2.1

Determine all possible strength combinations and identify the critical strength combination for the above truss. (Hint: Table G1) (8 marks)

2.2

Determine the forces in ALL the members ie AB, AD, BC, BD, CD. Assume that ALL the connections are pinned. Use only the critical strength combination. Determine which members are in tension and compression. (8 marks)

2.3

Design the critical compression member. The truss will be constructed from MGP12 timber. Assume that L ex will be the full length of the member and that Ley will be ¼ x Lex ie Ley = 0.25 * Lex. Assume each end of member is held by two bolts. Assume seasoned timber. If your first size doesn’t have enough capacity, complete at least 1 more iteration. (If you didn’t solve Q2.1, you can assume Nc*=35kN). (16 marks)

2.4

Design the critical tension member assuming that the truss will be connected using 2 rows of 2- M12 bolts at each end. If your first size doesn’t have enough capacity, complete as least 1 more iteration. (If you didn’t solve Q2.1, you can assume Nt*=30kN). (8 marks) Total = 40 Marks Page 3 of 12

CIVE3013 Steel and Timber Design

Question 3 A farmer wants to re-use an existing steel beam (UB) to support the first floor of his new residential house. The beam will span L (mm), the distance between the beam and a paralleled wall is B (mm), both shown in the sketch below:

Note*: Please find L (mm), B (mm) and Proposed UB section from attached Variables Table based on your student ID number (see at the end of the exam). Additional information : -

The floor dead load will be 1.0kPa (unfactored). The self weight of the beam is allowed for in this load. All dimensions are to the centerline of the members and all connections are pinned. Grade 300Plus steel will be used for all members.

3.1.

Determine the design live load for the residential first floor (in kPa) using AS1170.1 and the critical strength combination on the beam in kN/m. (6 marks)

3.2.

Determine the maximum bending moment and shear force for the beam. Draw the bending moment and shear force diagram for the beam. (6 marks)

Page 4 of 12

CIVE3013 Steel and Timber Design

3.3.

Check if the beam has sufficient bending moment capacity assuming that the beam will be fully laterally restrained by the floor joists. (6 marks)

3.4.

Determine if the beam has sufficient shear capacity. (6 marks)

3.5.

The allowable deflection of the floor beam is span / 500 ie L / 500. Determine if the beam is satisfactory for deflection due to dead load and short term live load. Use Ψs = 0.7. If the deflection of the beam does NOT meet this criteria, determine the maximum span (L) of the beam to achieve the deflection criteria above ie deflection NOT to exceed L / 500. (16 marks) Total = 40 marks

END OF EXAMINATION

Page 5 of 12

CIVE3013 Steel and Timber Design

Q2

StudentID

Q3

L (mm)

H (mm)

PG(kN)

PQ(kN) L (mm) B (mm) Proposed UB

100031342

4000

3100

20

15

8000

4000

250UB25.7

100080076

4000

3200

20

20

8000

4100

250UB25.7

100082243

4000

3300

20

25

8000

4200

250UB25.7

110067430

4000

3400

25

10

8000

4300

250UB25.7

110082160

4000

3600

25

20

8000

4500

250UB31.4

110109802

4000

3700

30

5

8000

4600

250UB31.4

110139094

4000

3800

30

10

8000

4700

250UB31.4

110143047

4000

3900

30

15

8000

4800

250UB37.3

110150092

4000

4200

20

15

8000

4900

250UB37.3

110154611

4000

4100

20

20

8000

5000

250UB37.3

110162515

4000

4200

20

25

8000

4100

250UB37.3

110164012

4000

4300

25

10

8100

4000

250UB37.3

110168088

4000

4400

25

15

8200

4000

250UB31.4

110170431

4000

4500

25

20

8300

4000

250UB31.4

110183590

4200

3100

30

5

8400

4000

250UB31.4

110183613

4200

3200

30

10

8500

4000

310UB32.0

110195041

4200

3300

30

15

7900

4500

310UB32.0

110195042

4200

3400

20

15

7800

4500

310UB32.0

110198225

4200

3500

20

20

7700

4500

310UB32.0

110205061

4200

3600

20

25

7600

4500

310UB32.0

110205231

4200

3700

25

10

7500

4500

310UB32.0

110206759

4200

3800

25

15

8000

4500

310UB32.0

110206905

4200

3900

25

20

8100

4000

250UB25.7

110207898

4200

4000

30

5

8200

4000

250UB25.7

Page 6 of 12

CIVE3013 Steel and Timber Design

Q2

StudentID

Q3

L (mm)

H (mm)

PG(kN)

PQ(kN) L (mm) B (mm) Proposed UB

110210764

4200

4100

30

10

8300

4000

250UB25.7

110211347

4200

4300

30

15

8400

4000

250UB31.4

110220206

4200

4300

20

15

8500

4000

250UB31.4

110220774

4200

4400

20

20

7900

4000

250UB31.4

110220874

4200

4500

20

25

7800

4000

250UB31.4

110221434

4000

3100

20

15

8000

4000

250UB25.7

110224354

4000

3100

20

15

8000

4000

250UB25.7

110226268

4000

3200

20

20

8000

4100

250UB25.7

110226360

4000

3300

20

25

8000

4200

250UB25.7

110226436

4000

3400

25

10

8000

4300

250UB25.7

110227499

4000

3600

25

20

8000

4500

250UB31.4

110227681

4000

3700

30

5

8000

4600

250UB31.4

110231603

4000

3800

30

10

8000

4700

250UB31.4

110231978

4000

3900

30

15

8000

4800

250UB37.3

110232743

4000

4200

20

15

8000

4900

250UB37.3

110233512

4000

4100

20

20

8000

5000

250UB37.3

110234831

4000

4200

20

25

8000

4100

250UB37.3

110235517

4000

4300

25

10

8100

4000

250UB37.3

110235755

4000

4400

25

15

8200

4000

250UB31.4

110236468

4000

4500

25

20

8300

4000

250UB31.4

110236694

4200

3100

30

5

8400

4000

250UB31.4

110236711

4200

3200

30

10

8500

4000

310UB32.0

110237420

4200

3300

30

15

7900

4500

310UB32.0

110237595

4200

3400

20

15

7800

4500

310UB32.0

Page 7 of 12

CIVE3013 Steel and Timber Design

Q2

StudentID

Q3

L (mm)

H (mm)

PG(kN)

PQ(kN) L (mm) B (mm) Proposed UB

110238043

4200

3500

20

20

7700

4500

310UB32.0

110238900

4200

3600

20

25

7600

4500

310UB32.0

110241095

4200

3700

25

10

7500

4500

310UB32.0

110242253

4200

3800

25

15

8000

4500

310UB32.0

110242782

4200

3900

25

20

8100

4000

250UB25.7

110243119

4200

4000

30

5

8200

4000

250UB25.7

110243505

4200

4100

30

10

8300

4000

250UB25.7

110243661

4200

4300

30

15

8400

4000

250UB31.4

110243973

4200

4300

20

15

8500

4000

250UB31.4

110244023

4200

4400

20

20

7900

4000

250UB31.4

110244195

4200

4500

20

25

7800

4000

250UB31.4

110245008

4000

3100

20

15

8000

4000

250UB25.7

110247426

4000

3100

20

15

8000

4000

250UB25.7

110247552

4000

3200

20

20

8000

4100

250UB25.7

110248632

4000

3300

20

25

8000

4200

250UB25.7

110249452

4000

3400

25

10

8000

4300

250UB25.7

110252270

4000

3600

25

20

8000

4500

250UB31.4

110253497

4000

3700

30

5

8000

4600

250UB31.4

110253932

4000

3800

30

10

8000

4700

250UB31.4

110254132

4000

3900

30

15

8000

4800

250UB37.3

110254570

4000

4200

20

15

8000

4900

250UB37.3

110255494

4000

4100

20

20

8000

5000

250UB37.3

110256574

4000

4200

20

25

8000

4100

250UB37.3

110256883

4000

4300

25

10

8100

4000

250UB37.3

Page 8 of 12

CIVE3013 Steel and Timber Design

Q2

StudentID

Q3

L (mm)

H (mm)

PG(kN)

PQ(kN) L (mm) B (mm) Proposed UB

110256899

4000

4400

25

15

8200

4000

250UB31.4

110257488

4000

4500

25

20

8300

4000

250UB31.4

110257689

4200

3100

30

5

8400

4000

250UB31.4

110258880

4200

3200

30

10

8500

4000

310UB32.0

110259128

4200

3300

30

15

7900

4500

310UB32.0

110259342

4200

3400

20

15

7800

4500

310UB32.0

110260122

4200

3500

20

20

7700

4500

310UB32.0

110262812

4200

3600

20

25

7600

4500

310UB32.0

110263056

4200

3700

25

10

7500

4500

310UB32.0

110265218

4200

3800

25

15

8000

4500

310UB32.0

110267830

4200

3900

25

20

8100

4000

250UB25.7

110268503

4200

4000

30

5

8200

4000

250UB25.7

110271137

4200

4100

30

10

8300

4000

250UB25.7

110273586

4200

4300

30

15

8400

4000

250UB31.4

110275828

4200

4300

20

15

8500

4000

250UB31.4

110275970

4200

4400

20

20

7900

4000

250UB31.4

110276769

4200

4500

20

25

7800

4000

250UB31.4

110278113

4000

3100

20

15

8000

4000

250UB25.7

110278205

4000

3100

20

15

8000

4000

250UB25.7

110278290<...