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Fundamentals of the Stiffness Method

  • William WeaverJr.
  • James M. Gere

Abstract

The stiffness method (also known as the displacement method) is the primary method used in matrix analysis of structures. One of its advantages over the flexibility method is that it is conducive to computer programming. Once the analytical model of a structure has been defined, no further engineering decisions are required in the stiffness method in order to carry out the analysis. In this respect it differs from the flexibility method, although the two approaches have similar mathematical forms. In the flexibility method the unknown quantities are redundant actions that must be arbitrarily chosen; but in the stiffness method the unknowns are the joint displacements in the structure, which are automatically specified. Thus, in the stiffness method the number of unknowns to be calculated is the same as the degree of kinematic indeterminacy of the structure.

Keywords

Stiffness Matrix Flexural Rigidity Joint Displacement Plane Frame Plane Truss 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Van Nostrand Reinhold 1990

Authors and Affiliations

  • William WeaverJr.
    • 1
  • James M. Gere
    • 1
  1. 1.Stanford UniversityUSA

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