The Portal Method is suitable for building which has a low elevation and uniform framing. The frames are considered to be a cantilever as they are fixed in the bottom. Moreover, to analyze the building frames using the portal method require following assumptions.
01. A hinge is placed at the center of each girder, since this is assumed to be a point of zero moment.
02. A hinge is placed at the center of each column, since this is assumed to be a point of zero moment.
03. At a given floor level the shear of the interior column hinges is twice that at the exterior column hinges, since the frame is considered to be a super position of portals.
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| Figure 01: A simple frame |
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| Figure 02: Application of assumption 03:the shear of the interior column hinges is twice that at the exterior column hinges |
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