DESIGN OF RCC STRUCTURES IN STAAD PRO

A: Option C sounds convincing because cracks are what everyone worries about first, but flexural cracking is governed by bending reinforcement and serviceability limits, not shear links. Option A reflects a real site failure: stirrups that exist but can't anchor don't arrest the crack. Option B points to a limit where shear steel can't help once the concrete strut fails. Option D is subtle and field-earned — poor anchorage means the shear force never gets into the steel, so cracks keep opening.

A: Option A feels procedural and neat, but matching combinations doesn't help if the model itself is wrong. Option B is a real test method, yet meaningless until you know what the model assumed. Option C is necessary for quality, though it doesn't validate reactions. Option D is where experienced reviewers start — wrong fixity quietly shifts reactions by double digits.

A: Option B looks suspicious to many juniors, yet equal steel can be valid. Option C is often intentional for durability. Option D mixes codes, but IS 456 legitimately governs design. Option A is the quiet trap — STAAD will analyse it, but the code assumption behind two-way behaviour breaks, and the drawing won't warn the site team.

A: Option C is tempting because serviceability is always discussed, but ductility doesn't stop deflection problems. Option A is exactly what under-reinforcement avoids. Option B is the behaviour designers rely on. Option D restates the mechanism — steel yields first, buying time.