Numerické modelování vybraných spojů dřevěných konstrukcí

Abstract

With the development of applications of timber structures and timber buildings in the Czech Republic the space opens for performing experimental (laboratory) tests and numerical modelling of structural timber. The new types of joints , especially glued lamellar elements of timber and timber-based composites have forced a new technical standards and computational approaches to address them. The aim of this work is to propose practical methods of feasible solutions of non - standard types of joints for timber structures, for which the technical standards do not provide appropriate guidance and in practice these connections have not been used, yes. The aim is to prepare mathematical models and their verification using procedures based on technical standards and to create recommendations for use them and for use of hand calculations based on the fundamental equations of statics and elasticity. The first chapter describes the area of studied problems, the analysis of timber structures. This chapter briefly describes the development of timber structures and possibilities of their analysis. The second chapter introduces the reader to the historical significance of timber as a building material, its properties and internal structure. Furthermore, this chapter describes the use of historical and contemporary joints of timber structures. The third chapter contains a description of the objectives of this dissertation. In the fourth chapter the methods of numerical modelling are described. The first subchapter deals mainly with timber and its description by as an orthotropic material. The second section contains description of plasticity conditions which are used for timber - based materials. The third section briefly summarizes the basic theory of finite element method which is used by the programs for numerical analysis. The fourth section is dedicated to the modelling of joints using finite element methods and recommendations for this modelling. In the fifth chapter include selected results which have been published in journal sand technical reports. There are numerical models of the structures and details of joints. These numerical models are supplemented by hand calculations. Part of the numerical models is also verified by experimental tests. The Conclusion contains a commentary on the results obtained and their analysis with recommendations and a summary of the procedures of numerical modelling joints of timber-based structures.