In analyzing frames with hinged joints, one cannot assume horizontal forces are zero without verification through equilibrium equations. The discussion emphasizes the importance of considering all forces, even when horizontal forces are not explicitly given. A practical example provided is a simple 3-hinged arch structure, which consists of two inclined rods on hinged supports subjected to a central point load. This example illustrates that balancing horizontal forces may still be present despite vertical loads only.
PREREQUISITESCivil engineers, structural analysts, and students studying mechanics of materials who are involved in the design and analysis of frame structures.