AbstractAbout AuthorsReferences
When compressing the masonry, brick and mortar strength is not fully used. Due to the irregularities of horizontal mortar joints, the brick is subjected to bending and shear. Tensile stresses can occur in the brick as a result of lateral expansion of the mortar in the horizontal joints in the case when the coefficient of transverse expansion of the mortar is higher than that of brick. Many foreign standards define the mark of brick strength according to one indicator only – a limit of compression strength that is guaranteed by high bending strength of made bricks made. Calculations by the formula of L.I. Onishchik show that the influence of bending and shear of bricks in the masonry decreases with the improvement of the quality of horizontal mortar joints and the surface of brick. Therefore, the appointment of the brand of ceramic bricks of format 1NF on strength should be done according to two factors: compressive and bending strengths. Stones and blocks having a height, and therefore the moment of resistance to bending greater than that of brick of 1NF format, are less prone to bending and shear due to the irregularities of mortar bed. For this reason, the appointment of their brand on strength is made only by the compressive strength.
M.K. ISHCHUK, Candidate of Sciences (Engineering), Head of Laboratory, (This email address is being protected from spambots. You need JavaScript enabled to view it.)
Research Institute of Building Constructions (TSNIISK) named after V.A. Kucherenko, JSC Research Center of Construction (6, 2-nd Institutskaya Street, Moscow, 109428, Russian Federation)
1. Code of Regulations 15.13330.2012 Stone and reinforced structures. Updated version of SNiP II-22-81 *. Moscow: Ministry of Regional Development of Russia, 2012. http://docs.cntd.ru/document/1200092703 (In Russian).
2. Kameiko V.A., Sementsov S.A. Sostoyanie i osnovnye napravleniya issledovaniya prochnosti kamennykh konstruktsii. V kn.: Teoreticheskie i eksperimental’nye issledovaniya kamennykh konstruktsii. Trudy TsNIIKS [The state and main directions of the study of the strength of stone structures. In: Theoretical and experimental studies of stone structures. Proceedings of the TsNIIKS]. Moscow: 1978, pp. 6–45.
3. Polyakov S.V. Dlitel’noe szhatie kirpichnoi kladki. Nauchnoe soobshchenie [Long-term compression of the brickwork. Scientific communication]. Moscow: Stroyizdat. 1959. 183 p.
4. Onishchik L.I. Kamennye i armokamennye konstruktsii promyshlennykh i grazhdanskikh zdanii [stone and reinforced stone constructions of industrial and civil buildings]. Moscow-Leningrad: State Publishing House of Building Literature. 1939. 215 p.
5. Onishchik L.I. Features of the work of stone structures under load in the stage of destruction. Collection: Studies on stone structures. Moscow: Stroyizdat. 1949, pp. 5–44.
6. Bedov A.I., Gabitov A.I. Proektirovanie, vosstanovlenie i usilenie kamennykh i armokamennykh konstruktsii [Design, restoration and strengthening of stone and reinforced structures]. Moscow: ASV. 2006. 556 p.
7. Polyakov S.V., Falevich B.N. Proektirovanie kamennykh i krupnopanel’nykh konstruktsii [Design of stone and largepanel structures]. Mosocw: Vysshaya shkola. 1966. 241 p.
8. EN 1966-1-1 Eurocode 6 - Design of masonry structures – Part 1-1: Generalrules for reinforced and unreinforced masonry structures. CEN, Brussels 2005. 123. p. https:// www.phd.eng.br/wp-content/uploads/2015/02/ en.1996.1.1.2005.pdf
2. Kameiko V.A., Sementsov S.A. Sostoyanie i osnovnye napravleniya issledovaniya prochnosti kamennykh konstruktsii. V kn.: Teoreticheskie i eksperimental’nye issledovaniya kamennykh konstruktsii. Trudy TsNIIKS [The state and main directions of the study of the strength of stone structures. In: Theoretical and experimental studies of stone structures. Proceedings of the TsNIIKS]. Moscow: 1978, pp. 6–45.
3. Polyakov S.V. Dlitel’noe szhatie kirpichnoi kladki. Nauchnoe soobshchenie [Long-term compression of the brickwork. Scientific communication]. Moscow: Stroyizdat. 1959. 183 p.
4. Onishchik L.I. Kamennye i armokamennye konstruktsii promyshlennykh i grazhdanskikh zdanii [stone and reinforced stone constructions of industrial and civil buildings]. Moscow-Leningrad: State Publishing House of Building Literature. 1939. 215 p.
5. Onishchik L.I. Features of the work of stone structures under load in the stage of destruction. Collection: Studies on stone structures. Moscow: Stroyizdat. 1949, pp. 5–44.
6. Bedov A.I., Gabitov A.I. Proektirovanie, vosstanovlenie i usilenie kamennykh i armokamennykh konstruktsii [Design, restoration and strengthening of stone and reinforced structures]. Moscow: ASV. 2006. 556 p.
7. Polyakov S.V., Falevich B.N. Proektirovanie kamennykh i krupnopanel’nykh konstruktsii [Design of stone and largepanel structures]. Mosocw: Vysshaya shkola. 1966. 241 p.
8. EN 1966-1-1 Eurocode 6 - Design of masonry structures – Part 1-1: Generalrules for reinforced and unreinforced masonry structures. CEN, Brussels 2005. 123. p. https:// www.phd.eng.br/wp-content/uploads/2015/02/ en.1996.1.1.2005.pdf
For citation: Ishchuk M.K. The role of brick bending strength at compression of masonry. Stroitel’nye Materialy [Construction Materials]. 2018. No. 8, pp. 63–65. DOI: https://doi. org/10.31659/0585-430X-2018-762-8-63-65 (In Russian).