Open AccessGLASS FIBER REINFORCED CONCRETE IN THIN-WALLED CONSTRUCTIONS
Author(s) -
L. A. Panchenko,
L. A. Panchenko,
Е. Ерижокова,
Е. Ерижокова
Publication year - 2019
Publication title -
vestnik bgtu im. v.g. šuhova
Language(s) - English
Resource type - Journals
ISSN - 2071-7318
DOI - 10.34031/article_5cb1e65c9f1f72.39954168
Subject(s) - fiber , materials science , glass fiber , von mises yield criterion , volume (thermodynamics) , composite material , precast concrete , structural engineering , engineering , finite element method , physics , quantum mechanics
Fibrous composites are progressive materials for buildings and structures. Structures based on them are characterized by high technical and economic characteristics. Glass fiber concrete is effective for thin-walled structures. Various principles of structural mechanics applied to fiber composites are pro-posed for solving design problems. The optimal configuration of the covering is determined by the sta-tionarity of its potential energy for given values of the calculated resistances of the material compo-nents. This formulation of the problem leads to a global minimum of the covering volume. In particu-lar, an axisymmetrically loaded spherical cover is considered; the optimal thickness is determined from the condition of equal resistance by the von Mises yield criterion. Types of elements for precast glass-fiber concrete of various spans are recommended. In addition, the shallow tunnels are consid-ered; they are a prevalent object of transport communications. The rationality of using the thin-walled spatial systems consisting of rectangular plates is established. The isoperimetric problem is solved for a given volume of material based on the generalized Lagrangian principles. The thickness of the rec-tangular plates of the spatial system of the tunnel is taken as a variable parameter.