Question

As space trusses are used in bridges. When the bridges are extended over long routes or distance then:

(a) A rocker or a roller is used at the joints

(b) They are not extended to such a long distance

(c) The bridges are painted

(d) The roads are made narrow

The question was posed to me during an online interview.

Query is from Space Trusses in portion Structural Analysis of Engineering Mechanics

Answer 1

Correct option is (a) A rocker or a roller is used at the joints

Easiest explanation: When the bridges are extended over long routes or distance then a rocker or a roller is used at the joints. This allows the bridge joints to move around. That is when the temperature is raised. The elongations and the contractions of the joints part are not much affected if the rollers and rockers are used.