Structural Analysis: Internal Forces and Displacements

This lecture discusses the analysis of a beam supported at three points, focusing on internal forces and displacements. The instructor explains the concept of a fundamental system, emphasizing the importance of making the structure isostatic by allowing freedom in kinematic conditions without external loads. The lecture covers the calculation of unknowns, particularly the internal moment represented as X, and how it affects the structure's behavior. The instructor illustrates the process of determining displacements associated with the unknowns A1 and A0 under different conditions. The lecture also highlights the significance of using the theorem of virtual work to calculate moments and angles in the structure. By analyzing the internal forces and their effects on the beam, the instructor provides a comprehensive understanding of how to approach structural problems involving internal moments and displacements, ensuring clarity in the calculations and the relationships between forces and displacements.