Special cases of uncracked sections and calculation of displacements
The procedures of analysis presented in Chapter 2 and in the present chap¬ ter give the values of the axial strain and the curvature at any section of a framed structure at any time after loading. These can be used to calculate the displacements (the translation and the rotation) at any section or at a joint. This is a geometry problem generally treated in books of structural analysis. In Section 3.8 two methods, which will be employed in the chapters to follow, are reviewed: the unit load theory based on the principle of virtual work and the method of elastic weights. The two methods are applicable for cracked or uncracked structures.