Estudo do traçado das linhas de influência dos esforços solicitantes em uma ponte em viga de concreto armado.

Abstract

The line of influence is a graphic representation that reveals at each point of a bridge how much effort will be required on it, due to a concentrated and/or distributed load. With this reference line, it is possible to discover which is the weakest point of the structure, so that we can combine the loads, in order that it is the most unfavorable for the bridge. In order to discover the greatest weakness of the bridge, it is necessary to calculate and compare several probable points of greatest effort. We have three types of influence lines, they can be obtained for Reactions, Shear and Bending Moments (+) and (-). It is up to the designer to design the bridge based on the discovery of this “worst” load. In other words, the influence line serves as an aid to determine the position of mobile and accidental loads, in the most critical way, so that they reach the maximum load values ​​for projection. Examples of these are for road and rail bridges, as has been said, not only the weight of the loads is important, but also the position in which these loads act on the structure. The combination of these two factors will guide the Structural Engineer towards the correct dimensioning of the structure. The main objective of this work is to apply the Lakmazaheri method (2022) and compare it with the results found in FTOOL. It appears that the results obtained by the Lakmazaheri method (2022) and the Ftool application are practically identical, validating the efficiency of the Lakmazaheri method (2022), showing the practicality and simplicity of the Lakmazaheri method (2022) in obtaining the internal efforts with the use of the Lines of Influence for the projection of its short bridges.