#### Assessment 2 Test UO Structures Exam

Table of Contents

## UO STRUCTURES 1 – ASSESSMENT 2 Online exam University of South Australia

Assessment Name | Assessment 2 – Test – Truss Analysis and Design Report |

Test Available from Test Due | 12 pm Adelaide Time on Saturday 20 ^{th} November 202112 pm Adelaide Time on Tuesday 23^{rd} November 2021 |

Weighting | 35% of the total grade for this course |

File Type to submit | One *.doc or *.docx file, with a maximum file size of 100MB |

Assessment 2 Test UO Structures

COURSE OBJECTIVES:

It is beneficial to familiarise yourself with the relationship between the assessment and the course objectives.

- CO1: Select and apply mathematical procedures to determine forces acting on structures and determine costs and use this to justify design decisions.
- CO2: Analyse and design physical structures and representations of structures to allow the calculation of support reactions, shear forces, bending moments and deflections.

ASSESSMENT SUMMARY:

COMPONENTS | COURSE OBJECTIVES | WEIGHTING | DUE DATE | DETAILS | SUBMISSION PROCESS |

2 Questions | CO 1, 2 | 35% | 12pm Adelaide time, Tuesday Week 10 | 3 days to complete and submit | Online |

ASSESSMENT DESCRIPTION

In this test, apply the relevant concepts covered in this course. In the first question, design different members of a truss, and in the second question determine loads, bending moments, shear forces and deflections in a building structure.

Where relevant, reference the relevant Australian Standard Loading Codes AS1170 and ASI Design Capacity Tables for Structural Steel.

Resources from weeks 1 – 10 will be a valuable reference.

### Notes:

**Test Conditions apply and there is to be no discussion with anyone else and no questions asked of teaching staff for the duration of the test.**Late submissions will not be accepted.- The Grade and Feedback for Assessment 1 Part B will be returned after both the Test (Assessment 2) has been submitted
*and*the Test deadline has elapsed. - If handwriting answers, the
**handwriting must be legible**and**pages are to be scanned**, not photographed.

### o Preferably, type the calculations using equation editor in MS Word.

**UO Structures 1 Test Instructions Read this page in detail**

- The Test is out of 100 marks and is worth 35% of overall course grade

- Answer All Questions

- No discussion is permitted with anyone, regarding the Test, until grades and feedback for the Test have been released.

- Late submissions will not be accepted.

- Except for the forums, all other course resources are available for your use for the duration of the test.

- Word document submission only
- Excel spreadsheets and software analysis tools will not be accepted for submission

- If handwriting calculations, the handwriting must be legible and pages are to be scanned, not photographed.
- Preferably, type the calculations using equation editor in MS Word.

### · Where relevant, diagrams must be included with calculations (e.g. Free body diagrams, tributary areas)

and these can be hand drawn and scanned in.

- Clear and informative diagrams can help the assessor follow your calculations and reasoning.

- For full marks for any part of a question, working must be displayed and units must be correct at every step of working.
- For example, in Question 1 Part A the correct support reactions with no working or free body diagram(s) to show how the support reactions were obtained, will score zero for that part.

- The marks for each part are
__underlined in bold font__

- Answers are to be correct to 1 decimal place.
- For example, an answer of “The force in member YZ is 125.367 kN (Compression)” can be written as

*The force in member YZ is 125.4 kN (Compression)*

- For example, an answer of “The force in member YZ is 300.00 kN (Compression)” can be written as

*The force in member YZ is 300 kN (Compression)*

- The
*Design Properties and Capacity Tables*can be found in the**Assessment 2**Section on the Course website.

- You will need to access the Australian Standards, especially AS/NZS 1170.1:2002 via Techstreet at the UniSA Library.

**QUESTION 1**

Use Figure 1, a pin jointed steel truss with bolted connections and the values presented in Tables 1 and 2, as well as your mathematical thinking and reasoning to respond to the following questions.

- Ignoring the self-weight of the members, determine the support reactions.
__10 marks__

- Ignoring the self-weight of the members, determine the force in the three members BC, BE, CD.

### 15 marks

- Design members BC, BE, CD. Use Equal Angle (EA) Sections for members in Tension and assume the member is bolted with 1 Hole in Leg. Use Square Hollow Sections (SHS) for members in Compression. For zero-force members use SHS 65x65x1.6.
__12 marks__

- Determine the stress, strain and elongation/shortening of member BC (Assume Esteel = 200,000 MPa)

# 8 marks

- Design the bolts for the connections on members BC, BE, CD. Use the same “Grade:8.8” bolt size for all connections. That is, whatever bolt size is selected on one member, needs to be used on the other two members.
__9 marks__

- The steel price is $15 per kg, and the bolt price is provided in Table 2. Determine the total cost of the material to build members BC, BE, CD.
__6 marks__

Remember to include free body diagrams at part (a) and part (b) and your answers must be consistent with the orientation of the truss presented in Figure 1.

**Table 1: Parameters you will use for Question 1**

P1 | P2 | P3 | 𝜽 | 𝜷 | L1 | L2 | L3 |

120kN | 170kN | 350kN | 45° | 10° | 4.4m | 5m | 3.2m |

**Figure 1: Steel Truss with bolted connection**

**Remember to include free body diagrams at part (a) and part (b) and your answers must be consistent with the orientation of the truss presented in Figure 1.**

**The x-axis is the horizontal axis. The y-axis is the vertical axis.**

**Table 2: Cost per bolt**

Cost per Bolt | ||

Bolt Size | Grade: 4.6 | Grade: 8.8 |

M12 | $9 | |

M16 | $11 | $20 |

M20 | $15 | $24 |

M24 | $17 | $26 |

M30 | $21 | $28 |

M36 | $23 |

**QUESTION 2**

A simple 6 storey building is to be constructed in Adelaide.

Use the details provided in Figure 2, Figure 3, and Table 3 to respond to the following questions.

- Calculate the dead load per area of the ﬂoor. The ﬂoor dead load consists of the ﬂoor weight plus a superimposed dead load for the wall partitions.
__7 marks__

- In the second floor beams, determine the maximum moment and maximum shear for beams A4-B4 and B4-C4 due to live load only. Also, in no more than 50 words, compare and discuss the maximum moment and shear of the two beams.
__10 marks__

- Calculate the deﬂection of beams A4-B4 and B4-C4 in the Second floor due to the dead load only if a cross section of 610 UB 101 is used. Also, in no more than 50 words, compare and discuss the deflection of the two beams.

# 6 marks

- In no more than 100 words, explain why I-shaped sections are usually used for beam members and also explain which part of an I-shaped section resists shear and which part resists moment.

# 5 marks

- Column
- Determine the force in columns A2 and B2 at the First Floor and Second Floor, due to dead load only
__6 marks__

- Determine the force in columns A2 and B2 at the First Floor and Second Floor, due to dead load only

- In no more than 50 words, Compare and discuss the loads of the edge (A2) and internal (B2) column. Also, in no more than 50 words, compare and discuss the loads of these columns in the Second and First floor.
__6 marks__

Your calculations are to be based on the following design assumptions:

- Ignore the weight of the beams and columns.
- Beams are simply supported at their ends
- The building has N levels
- First Floor

- Second Floor

- …

- N
^{th}Floor

- The loads on all ﬂoors including the roof (which is the ceiling of the N
^{th}Floor) are the same - All beam-column connections are pinned connections
- The slab design is a One-way slab in the Y-axis direction
- Assume Esteel = 200,000 MPa
- If required, make further design assumptions and justify with suitable explanations.

**Table 3: Parameters you will use for Question 2**

Number of floors (N) | Building function | Dead load due to partitions (kPa) | L1 (m) | L2 (m) | L3 (m) | L4 (m) | L5 (m) | Storey height (m) |

6 | Museum | 2kPa | 4.9m | 3.6m | 5.2m | 4m | 3.4m | 4m |

Floor Details (See Figure 2) | ||||

Floor surface | Sand | Concrete Slab | Ceiling | |

Clay tiling | Sand | Reinforcement ratio= 2.5% | Fibrous plaster | |

Thickness | 13mm | 35mm | 100mm | 29mm |

**Floor surface**

**Sand Concrete**

**Ceiling**

**Figure 2: Floor Detailing**

**Y **L_{1} L_{2}

**X ****Figure 3: Typical Floor Layout Plan**