Pretend that you're working as a transportation engineer for an agency like Caltrans, for example. Let's just say that you're part of a team working on the construction of a new bridge for automobile traffic. A structural engineer comes into your cubicle and offers to draw influence lines for the beam reactions at the support columns. Explain why these influence line drawings s/he makes will be very relevant to your project. Your explanation had better be clear and complete, or you will be marked down!
Before discuss about application of influence line diagram (ILD)we have to know besic definition of ILD.
It tells you the effect of unit load (shear force bending moment, axial force, deflection) which is applied at some location of structure over total span of structure.
The main purpose of drawing ILD to find out worst effect due to rolling loads(moving traffic) . In order to design structure(bridge) or to check and analyse the structure. From observing ILD we can find critical location and keep in mind such critical location we have to design components of bridge such as diamensions of girders, steel reinforcement details etc.
This ILD reduce complicated calculations and also consume time of calculation and make it easy.
That's why for design of traffic bridge structural engineer offers you draw ILD.
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