Aspekt promene geometrije pri dejstvu koncentrisane sile u projektovanju montažnih membranskih konstrukcija

Abstract

Point loads can act on membrane structures; nevertheless, they are rarely checked in the structural analysis. This is a consequence of the fact that there are no precise instructions that would oblige and direct membrane structures designers how to conduct this analysis. The work to create Eurocode for the Structural Design of Tensile Membrane Structures is underway. When this standard comes into force, it will require following Eurocode 1 with regard to actions on membrane structures. This means that point loads will be included in this structural analysis. However, the consequences of point load actions have yet to be investigated. The subject of this doctoral dissertation research is the change of geometry of membrane structures under point load action. The research for this doctoral dissertation is conducted by testing numerical models of membrane structures in software package Sofistik 2016. Parametric analysis is used to find out how much and in which way varying the values of selected parameters changes the geometry of membrane structures under point load action. Nine parameters divided into groups of those which are related to load, membrane material and the supports have been analyzed. A large number of models differing by parameter values has been created. The goal of the research is to find out how the change of values of analyzed parameters affects the changes of geometry, how big is the influence of these parameters, and what is the importance of point loads for changes of geometry of membrane structures. Based on the obtained results, the dependence of changes of geometry under point load on the analized parameters is determined. The results of the research show that the point load can cause larger changes of geometry compared to the area load whose value is taken to be the usual snow load. Since the point load actions are currently almost completely neglected, this result was not expected. Based on this, it can be concluded that the point load actions are very significant, and that it is necessary to further continue the research of point load action on membrane structures.