Structural masonry walls exposed to high temperatures with thermal expansion control

Julia Menegon, Ângela Gaio Graeff, Luiz Carlos Pinto Silva Filho

Abstract


This study evaluates the behavior of small clay hollow-bricks walls exposed to high temperatures. Blocks measuring 14 and 19 cm thick were used, with strengths of 7 and 10 MPa. The thickness of the joints, the mortar, and the coating influence was evaluated. The temperatures of the furnace, the interior and the surface of the walls, the expansion of the blocks and the crushing of the joints were measured. It was possible to infer that the samples presented good performance, maintaining their integrity, thermal insulation, and load-bearing capacity. The restriction of the boundaries did not cause the spalling of the blocks, however, it was possible to observe the stress transfer to them in samples with rigid joint mortar. The masonry measuring 19 cm wide and the ones with coating showed better thermal performance.


Keywords


high temperatures; structural masonry; masonry walls; clay hollow-bricks; fire resistance.

References


Al-Sibahy, A., Edwards, R. (2013), Behaviour of masonry wallettes made from a new concrete formulation under combination of axial compression load and heat exposure: Experimental approach. Engineering Structures, v. 48, p. 193–204, 2013.

http://dx.doi.org/10.1016/j.engstruct.2012.09.028

Associação Brasileira De Normas Técnicas. (2001), NBR 5628: componentes construtivos estruturais - determinação da resistência ao fogo. Rio de Janeiro.

Associação Brasileira De Normas Técnicas. (1980), NBR 6120 - Cargas para o cálculo de estruturas de edificações. Rio de Janeiro.

Associação Brasileira De Normas Técnicas. (2001b), NBR 14432 - Exigências de resistência ao fogo de elementos construtivos de edificações - Procedimento. Rio de Janeiro.

Ayala, F. R. R. (2010). Mechanical properties and structural behaviour of masonry at elevated temperatures. Tese (Doutorado) - University of Manchester, Faculty of Engeneering and Physical Sciences. p. 294.

Beber, A. J. (2003). Comportamento Estrutural de Vigas de Concreto Armado Reforçadas com Compósitos de Fibra de Carbono, p. 317.

British Standards Institution. (1987). BS 476: fire tests on building materials and structures. London.

International Ogranization For Standardization. (1994). ISO 834: fire-resistance tests - Elements of building construction. Genève.

Li, Y., Lu, X., Guan, H., Ying, M., Yan, W. (2015). A Case Study on a Fire-Induced Collapse Accident of a Reinforced Concrete Frame-Supported Masonry Structure. Fire Technology. https://doi.org/10.1007/s10694-015-0491-0

Navarro, M. C., Ayala, F. R. R. (2015). Degradación de Materiales de la Construcción Ante la Acción de Altas Temperaturas. Congreso Internacional de Ciencias de la Ingeniería, 2., 2015. Los Mochis. Anais... . Los Mochis.

Nguyen, T. D., Meftah, F. (2012). Behavior of clay hollow-brick masonry walls during fire. Part 1: Experimental analysis. Fire Safety Journal, v. 52, p. 55–64.

https://doi.org/10.1016/j.firesaf.2012.06.001

Russo, S., Sciarretta, F. (2013). Masonry exposed to high temperatures: Mechanical behaviour and properties - An overview. Fire Safety Journal, v. 55, p. 69–86, Elsevier.

Shieids, T. J., Connor, D. J. O., Silcock, G. W. H., Donegan, H. A. (1988). Thermal bowing of a model brickwork panel. International brick/block masonry conference, 8., 1988. Dublin. Anais... Dublin: Elsevier Applied Science, v. 2. p.846–856.

Souza, R. P. (2017). Avaliação da influência da espessura do revestimento argamassado e do carregamento no comportamento de alvenaria frente a altas temperaturas. Dissertação (Mestrado) - Universidade do Vale dos Sinos. São Leopoldo. 138 p.




DOI: http://dx.doi.org/10.21041/ra.v10i1.440

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