The study of full-scale samples of bent reinforced concrete beams using tensioned ropes in a synthetic shell filled with grease is considered in the article. The purpose of the research is to test reinforced concrete beams using post-tensioned ropes to assess the load-bearing capacity and stiffness. Experimental results of studies on bent samples with rope tension and without ropes are presented. The study on full-scale samples revealed a number of features of the work of bent beams with post-tensioned ropes. The use of a post-tensioned rope without coupling with concrete allows for a more evenly distributed development of normal cracks and reduces the width of the crack opening. Pre-tension cable reinforcement increases the load carrying capacity of the area of the transverse bend.

In this paper experimental studies of ring-shaped reinforced concrete matrices for explosive stamping on deformation indexes under the eff ect of impulse loads are viewed. The study was carried out on sample, which was subjected to explosive loading. The results of calibration tests using the “Dynamics- 1” strain gauge complex are presented. The dependence of the tension in the matrix on the reaction of the strain gauge system is obtained. The obtained experimental data are compared with theoretical calculations. The general results of the studies obtained are given taking into account their further use for serial testing of matrices in order to determine their durability.

Целью исследования, в продолжение проведенных исследований [1-6], является изучение методик расчета прогибов статически определимых железобетонных балок под действием равномерно распределенной нагрузки, а также сравнение результатов теоретического исследования. Схема загружения разработана с условием дальнейшего проведения экспериментальных исследований. Нагрузка принята эквивалентной равномерно распределённой. Расчетная схема исследуемых образцов представлена на рис. 1. Объектом исследования служит статически определимая железобетонная балка с прямоугольным поперечным сечением b=200 мм, h=400 мм и УДК 624.012.4

The article describes a new method for determining the design fi re resistance of composite (steel-concrete) building constructions of buildings. The advanced algorithm of the decision of the fi re-technical task in the part of express calculation of design fi re resistance of composite building constructions is given. A new constructive form of composite reinforced concrete structure of the building has been developed and the system of actions for assessing the fi re resistance of its elements at the level of inventions, which are implemented in building practice, has been improved. The components of the creative result of scientifi c work and the content of the technical eff ect, including resource saving, are introduced, with the introduction of an innovative solution in the practice of fi re protection and providing fi re resistance of perspective building constructions of buildings.