The above equation relates to force and displacement at a single point. We can write the above equation in the following form:ĭelta = unit shift of the respective point. In other words, the stiffness “S” is the force required at a given point to cause the unit to move at that point. 5.2, stiffness is the slope of this line. If an elastically behaving rod is exposed to an alternating axial tensile load (W), as shown in Fig.5.1 and a graph is drawn of load (W) versus displacement () the result will be a straight line as shown in fig. The stiffness of an element is defined as the force that must be applied at a given point to produce a unit displacement when all other displacements are constrained to be zero. The stiffness of a rod measures its resistance to deformation. The displacement analysis method is preferred over the computer implementation. The unknown displacements of the joints (the degrees of freedom of the structure) are calculated by solving simultaneous equilibrium equations. The displacement method of analysis writes the equilibrium equations in the form of the unknown joint displacements in terms of loads using load-displacement relationships. Also Read: How to calculate Catchment Area Stiffness or Displacement Method
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