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Welcome to the Spannovation weekly multiple-choice quiz to engage practicing and aspiring engineers to test their knowledge in bridge and seismic engineering. The quiz is open for a week, posted every Thursday and closed the following week. The winner will be selected from a random draw of correct entries, and the winner of the quiz will be announced along with the posting of the new quiz. The winner will be given a free subscription to one of the Spannovation Bridge & Seismic School online courses for a six-month period.

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Steel Truss Bridge

Take This Week’s Quiz

13 - 19 Mar 2025

Question

Question 1: Which of the following best explains why a Pratt truss is often more material-efficient than a Warren truss for bridges carrying moving loads?

a) The Pratt truss has diagonal members that alternate between tension and compression, reducing the need for oversized members.

b) The Pratt truss has shorter compression members and diagonal members that remain in tension, minimizing buckling concerns.

c) The Warren truss distributes forces more evenly, making it superior in all load conditions.

d) The Warren truss has longer diagonal members that only experience tension, making it more efficient for bridges.

Question

Question 2: A simply supported steel truss bridge has a span of 60m with 10 equal panels of 6m each. The bridge carries a uniformly distributed dead load of 30 kN/m and a live load of 25 kN/m. Using a load factor of 1.25 for dead load and 1.5 for live load, calculate the maximum axial force in the most heavily loaded diagonal member in the truss (assume a truss depth of 8m).

a) 1,890 kN

b) 2,250 kN

c) 2,520 kN

d) 2,813 kN

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