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Assumptions of Multi-stored and Multi-bay Frames

**Portal Method**
- Point of contra flexure is assumed to be at mid-height of each column.
- Point of contra flexure assumed to be at mid-span of each girder or beam.
- Horizontal shear on each story is divided between columns in that story such that each interior column carries twice as much shear as exterior Column caries.

**Cantilevers Method**
- Point of contra flexure is assumed to be at mid-height of each column.
- Point of contra flexure is assumed to be at mid-span of each girder or beam.
- Intensity of axial stress in each column of a story is proportional to the horizontal distance from the c.g of all the columns of that story.

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