Method of Sections: Frame vs. Trusses

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The method of sections can be applied to frames, but it is only effective if the structure consists entirely of two-force members. If the connections between members are fixed in both rotation and translation, the method may not yield accurate results due to the presence of moments. In such cases, analysis of each member individually or more complex methods like finite element analysis may be necessary. The method of joints similarly requires the assumption of two-force members to be valid. Therefore, careful consideration of the structure's characteristics is essential for accurate force analysis.
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Is it possible to use method of sections on a frame or only on trusses? I have a frame that opposes a horizontal load and to find the forces in each member, I used method of sections. Is this right or is the only way to solve the forces is by analysis of each member.
 
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When you say frame, do you mean the connection points between each member are fixed in both rotation and translation (e.g. they are moment connections)?
 
Method of sections only works if your structure is entirely composed of two-force members. This also holds true for the method of joints. If your structure contains moments or the assumption of only two-force members is not valid, then neither method will work and you will need to look at more complex methods (finite element).
 

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