Example of Portal Method of Analysis/ Statically Indeterminate Building Frame Approximate Analysis

The portal method for analyzing fixed-supported building frames requires the following assumptions:
1. A hinge is placed at the center of each girder, since this is assumed
to be a point of zero moment.
2. A hinge is placed at the center of each column, since this is assumed
to be a point of zero moment.
3. At a given floor level the shear at the interior column hinges is
twice that at the exterior column hinges, since the frame is considered
to be a superposition of portals.
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#Portal_Method_of_Analysis #Approximate_reactions #Approximate_moments

[@joemathai6253]

Finally someone that can explain it clearly. Thanks a lot!

[@oyamaemmanuel6623]

Great lesson.

[@randysaula7883]

veryyyyy helpful. Thank you

[@markjhunmantilla8972]

why is it that R prime y and S prime y are at opposite direction from P prime y and Q prime y?