Ефективність використання фібробетону як ядра для сталебетонних колон квадратного поперечного перерізу

Abstract

UA: У статті розглядається ефективність використання фібробетону як ядра для сталебетонних колон. Для цього на першому етапі проведено розрахунок сталебетонної колони з використанням як ядра перерізу бетону марки С20/25. На наступному етапі дослідження підібрано поперечні перерізи з використанням фібробетону зі сталевою та базальтовою фібрами при різних значеннях товщини сталевої оболонки.

EN: The article examines the effectiveness of using fiber concrete as a core for reinforced concrete columns with a square cross-section. For this, at the first stage, the calculation of a steel-concrete column with dimensions of 100×100×3 mm, length of 500 mm was carried out using as a core a cross-section of concrete grade C20/25. At the next stage of the research, based on the conditions of the same bearing capacity of the columns, cross-sections were selected using fiber concrete with steel and basalt fibers at different values of the thickness of the steel shell. Steel fiber "Chilyabinka" was used, which was introduced at the rate of 32,536 kg/m3 of concrete. Basalt fiber was used with a length of 12 mm, and was added in the amount of 0.2% of the mass of cement. The dependence of the area of the concrete core and the area of the steel shell on the thickness of the steel shell is plotted. A comparison of the cost and characteristics of reinforced concrete columns with the use of ordinary concrete and fiber concrete with two types of fibers as a core cross-section was also carried out: steel and basalt. Based on research, the following conclusions can be drawn that the use of fiber concrete as the core of a steel concrete column of rectangular crosssection significantly improves a number of characteristics. Thus, with the same bearing capacity and thickness of the shell, the cost of a column with a core made of steel fiber concrete is reduced by 15%, weight by 26%, crosssectional size by 13% compared to concrete without fiber. The cost of a column with a core made of basalt fiber concrete is reduced by 12%, weight by 21%, cross-sectional size by 9% compared to concrete without fiber. By changing the thickness of the steel shell, you can also influence the characteristics of the column, in particular, reduce the cross-sectional dimensions and weight. But at the same time, the cost of the column increases.