Two piers from different eras, used to support civil structures, are shown.
Outline how innovations in engineering materials have improved the inservice properties of piers. (2 marks)
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Two piers from different eras, used to support civil structures, are shown.
Outline how innovations in engineering materials have improved the inservice properties of piers. (2 marks)
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Improvements in pier properties :
→ Concrete better than timber at resisting insect attack
→ Concrete less susceptible to environmental conditions.
→ Concrete properties include increased strength and durability
→ Less maintenance with concrete blocks
Improvements in pier properties :
→ Concrete better than timber at resisting insect attack
→ Concrete less susceptible to environmental conditions.
→ Concrete properties include increased strength and durability
→ Less maintenance with concrete blocks
Why did steel replace cast iron in bridges built after 1850 ?
→ Steel is stronger, more ductile, and has a higher tensile strength compared to cast iron, allowing for the construction of larger and more durable structures.
→ Cast iron generally has greater compressive strength than steel (eliminate D).
An image of an Allen truss bridge is shown.
Which of the following correctly identifies the loading conditions of an Allen truss bridge?
→ Members of a truss can only be in either tension or compression.
→ Steel has very high tensile strength, and although timber has lower tensile strength it has relatively high compressive strength.
→ Therefore D is the only answer that would produce an effective truss.
The image shows part of a large anchor recovered from waters off Western Australia. The anchor's approximate date of manufacture was 1790 .
This anchor is most likely made from
By Elimination:
→ In 1790 mild steel and silicon steel did not exist (eliminate
→ Since it is less brittle, wrought iron would have been used as anchors are subjected to sudden impacts against rocks (eliminate
The table shows materials that have been used to build civil structures over time.
Which row of the table shows the use of the materials in the correct historical order?
By Elimination:
→ Stainless steel must have been used after mild steel as it is an alloy of mild steel (not
→ Stone was used before iron as it did not require any processes to be formed (not