FULL-SCALE TESTS OF FLOOR SLABS OF LARGE-PANEL RESIDENTIAL BUILDINGS OF THE 97TH SERIES

Abstract

The authors consider objects of large-panel residential buildings, namely floor slabs, in this study. In view of the fact that the existing design of the slabs was carried out according to the old technical and regulatory documentation to comply with the requirements of modern regulatory documents «StroyPanelKomplekt» proposed new design solutions for the floor slabs of 97 series. The main design features of the slabs after the change in design solutions are: increased cross-sectional area of the working reinforcement (from 6 mm to 8 mm), increased concrete protective layer up to 25 mm. Therefore, before the start of mass production of these slabs, full-scale tests were carried out by «StroyPanelKomplekt» together with the department «Construction production and geotechnics» of PNRPU. The tested slab P3-6-501 is a floor element for large-panel residential buildings of the 97th series. The slab in the building is supported on four sides by internal and external wall panels, concrete design class B15. The design class of the working fittings is A400. During the tests, the indicators necessary for assessing the strength, stiffness and crack resistance, as well as the nature of destruction were controlled, including: the values of the loads causing the controlled limit state; product deflections; crack opening width. To measure the deflections, we used measuring instruments and instruments with a scale division of 0.01 mm, namely, 6PAO deflection meters. To measure the width of the crack opening during the tests, an MPB-2 microscope with a scale of 0.05 mm was used. The test results are presented in this article.