Crack Growth Resistance of Cellular Concrete Walls in Buildings with Reinforced Concrete Frame

ABSTRACT

The results of numerical studies of cellular concrete walls of buildings with reinforced concrete monolithic frame with supporting troughs overlap and shrinkage of masonry are presented. On the basis of realized research the features of the stress-strain state of the walls and the formation of cracks in them are revealed. It is established that during the deflection of the overlap, the maximum values of the main tensile stresses in the masonry of continuous filling occur along the border of the contact zone of the masonry with the overlap, and in the wall with the doorway in the upper corners of the opening. It is shown that shrinkage of the masonry causes the appearance of the main tensile stresses in the wall, the trajectories of which coincide with the direction of the horizontal mortar joints. In this case, in the walls with window openings, the most sub-windowed area of masonry is most prone to cracking. The dependences that connect the stiffness of the nodes of the interface of the wall with the vertical elements of the frame with the magnitude of the main tensile stresses arising in the wall at normalized values of shrinkage deformations of the masonry are obtained. The effect of friction coefficients between masonry surfaces and floors on the magnitude of the main tensile stresses arising in the wall during floor deflection and masonry shrinkage is shown. Constructive applications have been proposed to reduce the risk of cracking in the walls of frame buildings. These measures include the installation of a separating layer between the masonry and the floor slab, the use of malleable bonds in the junctions of the wall filling with the frame, as well as the local reinforcement of the masonry with grids of composite materials in places of the expected formation of cracks.

Keywords: masonry, cellular concrete blocks, shrinkage, floor slabs deflection, connecting elements, reinforcing meshes.

For citation: Derkach V. Crack Growth Resistance of Cellular Concrete Walls in Buildings with Reinforced Concrete Frame. Contemporary Issues of Concrete and Reinforced Concrete: Collected Research Papers. Minsk. Institute BelNIIS. Vol. 10. 2018. Pp. 155–168. https://doi.org/10.23746/2018-10-10 (in Russian)

Full text in Russian:



References:

1. Derkach V. N. Stroitelstvo i rekonstruktsiya. 2012. No. 2 (40). Pp. 3–11. (rus)
2. Derkach V. N., Orlovich R. B. Zhilishchnoye stroitelstvo. 2012. No. 8. Pp. 34–37. (rus)
3. Derkach V. N. Promyshlennoye i grazhdanskoye stroitelstvo. 2013. No. 6. Pp. 62–66. (rus)
4. Brameshuber W., Beer I., Bong-Gu Kang Untersuchungen zur Vermeidung von Rißschäden bei nichttragenden Trennwänden // Mauerwerk. 2007. No. 11. Heft 1. Pp. 54–62.
5. Derkach V. N. Stroitelstvo i rekonstruktsiya. 2013. No. 4 (48). Pp. 14–22. (rus)
6. Kania T. Analiza przyczyn pekania scian dzialowych w nowooddanym wysokim budynku mieszkalnym w Warszawie // XXV Konferencja Naukowa-Techniczna. Miedzyzdroje, 24‒27 maja, 2011. Pp. 443–450.
7. Derkach V. N. Problemy sovremennogo betona i zhelezobetona: Collected Research Papers Annual. Minsk. 2014. Vol. 6. Pp. 90–97. (rus)
8. Derkach V. N. Arhitektura i stroitelstvo. 2015. No. 1. Pp. 14–16. (rus)

ISSN 2076-6033