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Example 4.14: The three-span continuous concrete girder of an existing highway bridge The variation of the moment of inertia along its length is shown in Fig. We begin this chapter with the derivation of the three-moment equation for beams with prismatic spans and subjected to external loads and support settlements. The three-moment equation gives us the relation between the moments between any three points in a beam and their relative vertical distances or deviations. Aug 19, 2018 -The continuous beams are very common in the structural design and it is necessary to develop simplified force method known as three moment equation for their The algebraic sum of the primary and secondary moments then represents the The Theorem of Three Moments is known to most engineers in the following