Find the SF and BM for the girder at a distance of 40m from the left end. The supporting cable has a central dip of 12m. Find, also the maximum tension in the cable and draw the BMD for the girder.

Subject : Structural Analysis 1

Topic : Cable & Suspension Bridge

Difficulty : High

1.To find support reaction:

Considering the stiffening girder as a suspension beam supporting the given external load system,

$ \Sigma M_{a}=0 $

$240 *25+300*80-V_{B}*120=0 $

$V_{B}=250KN $

$\Sigma F_{Y}=0 $

$V_{A}-240-300+250=0 $

$V_{A}=290KN $

2.To find H:

Beam moment at C$= BM_{c}=290*60-240*35) $

$BM_{c}=9000KNm $

Beam moment under the 240KN …