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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Experimental investigation on structural concrete masonry in fire: emphasis on the thermal behavior and residual strength

Full text
Author(s):
Davi Fagundes Leal ; Rafael Henrique Dupim [2] ; Jorge Munaiar Neto [3] ; Márcio Roberto Silva Corrêa [4]
Total Authors: 4
Document type: Journal article
Source: Rev. IBRACON Estrut. Mater.; v. 14, n. 4 2021-05-21.
Abstract

abstract: This paper aims to analyze the thermal behavior and residual mechanical properties of concrete hollow-blocks structural masonry and its component materials in fire situation using experimental investigation. Compression tests were carried out on blocks, prisms and small walls at room temperature and after being exposed for 70 minutes to the ISO 834 Standard Fire. The test at high temperatures was run using a furnace powered by natural gas and instrumented with thermocouples to measure temperatures in the specimens. The influence of the initial concrete strength on masonry behavior was evaluated considering the use of blocks with different strengths at room temperature. In addition, exposure to fire was also investigated considering masonry elements with no coverings and submitted to two different fire exposure conditions: one or both sides. The results indicate a substantial loss in the masonry load capacity at high temperatures, especially in cases of fire exposure on both sides, where the residual compressive strength resulted, on average, between 20% and 27% for the blocks and approximately 14% for prisms and small walls. Its performance with fire heating up on only one face is much higher, with an average residual masonry strength equal to 46% compared to its strength at room temperature. The obtained results are also useful for evaluating masonry regarding the integrity and thermal insulation criteria, the latter achieved with little over 60 minutes of testing. (AU)

FAPESP's process: 17/20255-4 - Numerical and experimental analysis of mansory elements in fire aiming standards.
Grantee:Carlito Calil Junior
Support Opportunities: Regular Research Grants