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How many independent equations must be fulfilled to achieve static equilibrium in a planar structure?

Structural Analysis MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Structural Analysiscivil-engineering-mcqs › structural-analysis
Published
19 Jan 2019
Last updated
28 May 2026

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Explanation

For a structure lying in a plane, static equilibrium requires satisfying three independent equations: the sum of forces in the horizontal direction, the sum of forces in the vertical direction, and the sum of moments about a point must all be zero.

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Practice related questions from the same subject.

  1. 1.Consider the following statements regarding the applicability of displacement and force methods in structural analysis. Which pair of statements is accurate?
  2. 2.For a stable structure, which statements correctly describe the characteristics of the diagonal elements in the flexibility and stiffness matrices?
  3. 3.How is the j-th column of the flexibility matrix obtained?
  4. 4.According to the slope deflection method, which of the following forces are responsible for causing deformations?
  5. 5.For a pin-jointed planar frame with m unknown member forces, r unknown reaction components, and j joints, how is the degree of static indeterminacy calculated?
  6. 6.What is the degree of static indeterminacy for a rigidly connected planar frame consisting of 15 members, 14 joints, and 3 reaction forces?
  7. 7.What are the independent displacement components at every joint in a rigid-jointed planar frame?
  8. 8.Under which condition is a pin-jointed planar frame considered unstable?
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