ШИРИНА РАСКРЫТИЯ НОРМАЛЬНЫХ ТРЕЩИН В ЖЕЛЕЗОБЕТОННЫХ БАЛКАХ ТРАПЕЦИЕВИДНОГО ПОПЕРЕЧНОГО СЕЧЕНИЯ

Abstract

The article discusses experimental studies of the values of the crack opening width at various stages of loading the investigated trapezoidal beams. For comparison, reference samples of rectangular and tee cross-sections with the same overall dimensions are also considered. The use of trapezoidal beams in construction practice can significantly reduce the consumption of concrete in comparison with rectangular beams. It should be noted that when constructing trapezoidal beams, complete disassembly of the formwork is not required in comparison with beams of T-shaped and rectangular profiles. The paper compares the values of the loads of the appearance of the first cracks in beams with different transverse outlines. The values of the loads corresponding to the achievement of the normative limiting value of the crack opening width have been determined. In the course of the study, it was found that cracks in trapezoidal beams reach the maximum opening width at a higher loading level than cracks in rectangular and tee beams due to a greater number of cracks along the length of the element. An analysis of both absolute and relative characteristics was carried out, taking into account the consumption of concrete over the section of the elements. The main advantages and disadvantages of bending reinforced concrete elements of trapezoidal cross-section in comparison with reference samples are highlighted