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In the approximate portal method for a multistorey frame under lateral loading, points of contraflexure are commonly assumed at the

Correct answer: D. Mid-height of columns and midspan of beams

  • A. Quarter-height of columns and beam midpoints
  • B. Column bases and beam ends
  • C. Top of columns and beam supports
  • D. Mid-height of columns and midspan of beams

Explanation

The portal method commonly assumes points of contraflexure at the mid-height of columns and the midspan of beams. This assumption simplifies the analysis of lateral loads by dividing members into approximately determinate segments.

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About Structural Analysis

Structural analysis determines how beams, frames, trusses and arches carry loads through reactions, shear forces, bending moments, axial forces and deflections. It covers free-body diagrams, equilibrium equations, determinacy, influence lines and methods such as slope deflection, moment distribution and virtual work, while distinguishing analysis of a structure from its design.

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