Steel timber-concrete beams. Numerical and full-scale experiments

Abstract

The first composite beams in the cross section of which concrete and wood were used, were patented at the end of the 19th century. In this article, technical solutions are analyzed based on works of the recent years. New beam designs have been developed. The Russian Federal Service for Intellectual Property (Rus. Rospatent) has issued patents to Kazan State University of Architecture and Engineering (KSUAE) for invention and utility model of new solutions of steel-concrete section beams. Analytical and experimental studies, the experience of using wood-concrete and wooden structures with reinforcement from different materials in the stretched area of the beam are studied. Based on their analysis, new solutions for steel-concrete beams were developed, in which bent steel profiles were used in the stretched zone of the beam, a research program was drawn up. Numerical studies of steel-concrete beams and thickness variations of bent steel profiles, wall height, pitch, length and diameter of self-tapping screws were carried out. Experimental studies were carried out using a beam model, the parameters of which are taken from the results of numerical studies. The methodology and test results of the beam are given. The test results are presented in the form of graphs of stresses, deformations, deflections. In conclusion, satisfactory convergence of the results of numerical and laboratory studies of the studied beams of composite section is noted.