The 'approximate analysis' of building frames under lateral loads (portal frame method) assumes:
Choose the correct answer
All members have same stiffness (EI uniform)
Inflection points at mid-height of columns and mid-span of beams; interior columns resist double shear of exterior
Only horizontal loads exist
All beam moments are zero
Correct Answer
B. Inflection points at mid-height of columns and mid-span of beams; interior columns resist double shear of exterior
Why is this the answer?
Portal method (lateral loads, low-rise frames): (1) Inflection point at mid-height of each column; (2) Inflection point at mid-span of each beam; (3) Internal columns carry twice the shear of exterior columns (assume each bay is a portal frame). Results in statically determinate sub-frames. Suitable for low-rise frames (< 10 storeys). Cantilever method: assumes column axial force proportional to distance from centroid (for tall frames).
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