Which of the following assumptions is not correct for plastic design?(a) plastic hinge rotations are small compared with elastic deformations so all the rotations are concentrated at plastic hinges(b) segments between plastic hinges are rigid(c) influence of normal and shear forces on plastic moments is not considered(d) plane section remains plane after bending and the effect of shear is neglectedThis question was addressed to me during an online interview.My question comes from General Requirements for Plastic Design and Plastic Hinge in division Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures

Which of the following assumptions is not correct for plastic design?(

1.	Which of the following assumptions is not correct for plastic design?(a) plastic hinge rotations are small compared with elastic deformations so all the rotations are concentrated at plastic hinges(b) segments between plastic hinges are rigid(c) influence of normal and shear forces on plastic moments is not considered(d) plane section remains plane after bending and the effect of shear is neglectedThis question was addressed to me during an online interview.My question comes from General Requirements for Plastic Design and Plastic Hinge in division Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures
Answer» RIGHT answer is (a) plastic hinge rotations are small compared with elastic deformations so all the rotations are concentrated at plastic hinges To elaborate: The plastic hinge rotations are large compared with elastic deformations so all the rotations are concentrated at plastic hinges. The SEGMENTS between plastic hinges are rigid. The INFLUENCE of NORMAL and shear forces on plastic moments is not considered. The plane section remains plane EVEN after bending and the effect of shear is neglected.

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