Multiple choice

A beam PQRS is 18 m long and is simply supported at points Q and R 10 m. Overhangs PQ and RS are 3 m and 10 m part. Overhangs PQ and RS are 3 m and 5 m respectively. A train of two point loads of 150 kN and 100 kN, 5 m apart, crosses this beam from left to right with 100 km load leading.

During the passage of the loads, the maximum and the minimum reactions at support R, in kN, are respectively

  1. 300 and - 30

  2. 300 and - 25

  3. 225 and - 30

  4. 225 and - 25
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The reaction at support R is determined by placing the moving loads at positions that maximize and minimize the reaction. By analyzing the beam as a simply supported span with overhangs, the extreme values for the reaction at R are 300 kN and -30 kN.

Keep practicing — related questions