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In first order elastic analysis, equilibrium is expressed in terms of ___________

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In first order elastic analysis, equilibrium is expressed in terms of ___________

(a) geometry of deformed structure

(b) geometry of undeformed structure

(c) geometry of both deformed and undeformed structure

(d) geometry of any structure

This question was addressed to me in exam.

Question is taken from Methods and Assumptions of Analysis in portion Structural Analysis, Loading and Load Combinations of Design of Steel Structures

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The correct choice is (b) geometry of undeformed structure

The best I can explain: In first order elastic analysis, equilibrium is expressed in terms of geometry of undeformed structure. This assumption is valid when elastic displacement are small compared to dimensions of structure.

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