Two vehicles are crossing a bridge 30m long. a passenger van weighing 11,000N is 7m from one end. a truck weighing 42,000N is 9m from the other end. if the bridge is symmetrical and weighs 1.3MN, what are the reations on the two supports at the ends of the bridge?

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Answers

2014-09-07T19:47:12+08:00
 relations? a force?
if force
take summation of moment at one end, let x =force on one end support
x(30m)=11kN(7m)+42kN(21m)+1.3x10^3kN(15m)
x=20459/30 = 681.97 kN
then summation of moment on  another end, let y = force of another end support
y(30m)= 42kN(9m)+ 11kN(23m) + 1.3x10^3kN(15m)
y=20131/30=671.03kN
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