Comparison of analytical methods for obtaining the equivalent strength of sandwich panels produced with different connectors
DOI:
https://doi.org/10.46421/encac.v17i1.3805Keywords:
Thermal performance, NBR 15575, Sandwich panels, Equivalent thermal resistance, FRP connectorAbstract
Sandwich panels are a type of wall consisting of two layers of concrete, and an inner layer of insulating material. They are commonly used as an option to improve thermal performance of buildings internationally, but they are little explored in Brazil. Moreover, the metallic connectors commonly used to join these layers generate thermal bridges that can reduce this performance. The use of Glass Fiber Reinforced Polymer (FRP) connectors has emerged as an alternative. The aim of this work is to calculate the equivalent thermal resistance of a sandwich panel with two types of connectors by different analytical methods to verify the impact on the results regarding the level of thermal performance by the simplified method normative. The methods are: ASHRAE's Parallel Flow and Isothermal Planes, and ABNT NBR 15220:2005’s. Although differences between them were detected, they were not enough to change the result of thermal performance by the simplified method of ABNT NBR 15575: 2021 for any Brazilian bioclimatic zone, being reached the minimum level for all of them.
References
ABNT. Associação Brasileira de Normas Técnicas. NBR 15220: Desempenho térmico de edificações. 1. Ed. Rio de Janeiro: 2005.
ABNT. Associação Brasileira de Normas Técnicas. NBR 15575: Edificações habitacionais – Desempenho 1. Ed. Rio de Janeiro: 2021.
ASHRAE. ASHRAE Handbook: Fundamentals, American Society of Heating, Refrigerating and Air-Conditioning Engineers. Atlanta, GA: [s.n.]. 2001.
ASHRAE. AMERICAN NATIONAL STANDARDS INSTITUTE. ASHRAE STANDARD 90-1: Energy Standard for Buildings Except Low-Rise Residential Buildings. Atlanta, GA: 2016, 2016.
FJP. Fundação João Pinheiro. Déficit Habitacional no Brasil. Disponível em: <https://fjp.mg.gov.br/deficit-habitacional-no-brasil/>. Acesso em: 10 abr. 2023.
KIM, Yail. J.; ALLARD, Austin. Thermal response of precast concrete sandwich walls with various steel connectors for architectural buildings in cold regions. Energy and Buildings, v. 80, p. 137–148, 2014. https://doi.org/10.1016/j.enbuild.2014.05.022.
KNÖNER, Nery. Análise experimental da ligação entre placas de painéis sanduíche unidas com treliça metálica. Tese (Doutorado) – Estruturas e Construção Civil, Universidade Federal de São Carlos, p. 179, 2019.
LAMEIRAS, Rodrigo Melo. Sandwich structural panels comprising thin-walled SFRSCC and GFRP connectors : from material features to structural behaviour. Tese (Doutorado em Engenharia Civil). Universidade do Minho, Guimarães, Portugal, p. 446, 2015.
LEE, Byoung-Jun.; PESSIKI, Stephen. Analytical investigation of thermal performance of precast concrete three-wythe sandwich wall panels. PCI Journal, v. 49, n. 4, p. 88–101, 2004.
MORGADO, Tiago. et al. Resistência ao fogo de perfis pultrudidos de polímero reforçado com fibras de vidro (GFRP) para aplicações em reabilitação: Estudo experimental, numérico e analítico. Revista ALCONPAT, v. 6, p. 157–172, 2016.
SANTOS, Tiago. Avaliação das Vantagens Económicas e Tecnológicas da Utilização do Conceito de Sistema Modular para Edifícios. Dissertação (Mestrado) - Estruturas e Geotecnia, Escola de Engenharia, Universidade do Minho, p. 215, 2010.
SILVA, John Kennedy Fonsêca. Avaliação experimental sobre o comportamento mecânico de conectores de cisalhamento do tipo PERFOFRP em paredes pré-moldadas de concreto com isolamento incorporado. Dissertação (Mestrado) – Estruturas e Construção Civil, Departamento de Engenharia Civil e Ambiental, Universidade de Brasília, p. 99, 2020.
SOARES, Nelson. et al. Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review. Energy and Buildings, v. 182, p. 88–110, 2019. https://doi.org/10.1016/j.enbuild.2018.10.021.
YU, Sisi. et al. Theoretical, experimental and numerical study on the influence of connectors on the thermal performance of precast concrete sandwich walls. Journal of Building Engineering, v. 57, n. 13, p. 104886, 2022. https://doi.org/10.1016/j.jobe.2022.104886.
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