Direct rigidity method applied to frames with variable section

Abstract

The purpose of this research article is to “Demonstrate the effectiveness of the direct stiffness method applied in variable sections”, using the SAP2000 software as aid material for the verification of the analysis of the variable section. The scope of our product is descriptive. and comparative since it demonstrates the direct stiffness method in variable sections being analyzed and verified by software. The methodology used is descriptive; The internal development was a frame with a variable section developed manually, resulting in a Q-D system, given the parameters of the method given by the direct rigidity method, because the precision of the analytical calculations must be known, which include: the main system, the transport factors and then the system matrix, resulting in the load vectors, internal forces, their bending, moment diagrams and the shear force diagrams. The discussion concerns; Since results in shear force and bending moment diagrams are often determined in decimals when analyzed by direct manual stiffness method analysis, it is necessary to verify the accuracy of these solutions in order to perform more precise calculations.