In a ductile material, which two stresses are used to calculate the factor of safety (FOS)?
- Working and yield
- Working and compressive
- Bending and yield
- Bending and compressive
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In a ductile material, which two stresses are used to calculate the factor of safety (FOS)?
→ FOS is calculated using yield and working stress in ductile materials.
A bus shelter is shown.
Describe a testing procedure that could be used to determine the structural strength of the laminated timber beam. Support your answer with a labelled sketch. (4 marks)
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Traverse Bend Test
→ Used to measure the beam’s flexural strength.
→ A single or double point load is applied to a beam supported at both ends.
→ The measured deflection is plotted onto a load/deflection graph.
Traverse Bend Test
→ Used to measure the beam’s flexural strength.
→ A single or double point load is applied to a beam supported at both ends.
→ The measured deflection is plotted onto a load/deflection graph.
A sketch of a post-tensioned concrete beam is shown.
Which of the following shows the most likely loading condition the beam is designed to resist when viewed from the front?
→ Concrete has high compressive strength, while the steel reinforcements have high tensile strength.
→ Hence, the most likely loading scenario will put the bottom of the beam in tension and the top in compression.
A cured cylindrical concrete specimen is tested under a compressive load through its vertical axis, until it fails.
Which of the following is the most likely shape of the front view of the failed specimen?
→ There are 3 common fracture patterns in concrete under compressive testing.
→ Of the options given,
Which of the following is a specialised test used to determine the compressive strength of cured concrete?
Considering each option:
→ Slump test – tests the workability and consistency of wet concrete.
→ Janka hardness test – tests hardwood flooring.
→ Shore hardness test – tests soft elastomers and other soft polymers.
→ Rebound hammer test – tests the compressive strength of cured concrete.