TGPSC HMWSSB Manager 2015 Paper 2 · Question 125

Question 125 of the TSPSC Manager (Engineering), HMWSSB, 2015: Paper 2 (Civil Engineering) (1 November 2015). Try it first, then open the answer and explanation.

1. Manager 2015 Paper 2 (Civil) · Q125 · Strength of Materials & Structural Analysis · Structural Analysis

   In the stiffness matrix method, the boundary conditions are needed to avert ______.

   1. divergent solution
   2. singularity
   3. irrational solution
   4. zero displacement vector
   Show answer

   Answer: (2) singularity

   Without support conditions the assembled structure stiffness matrix permits rigid-body movement and is singular (its determinant is zero), so it cannot be inverted. Applying the boundary conditions removes these rigid-body modes and makes the matrix non-singular.

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