Influence of temperature on the bending capacity of timber beams strengthened with CFRP laminate
Journal Title: Annals of WULS, Forestry and Wood Technology; Zeszyty naukowe SGGW - Year 2016, Vol 94, Issue
Abstract
Influence of temperature on the bending capacity of timber beams strengthened with CFRP laminate. Nowadays external bonding of high strength fiber laminates is very popular method of enhancing the load capacities of existing structures. Sometimes those strengthenings are subjected to direct sun exposition. Paper shows the dangers appearing due to the uncontrolled growth of temperature caused by the solar radiation. Possible development of temperature was investigated by the exposition of timber samples during the summer months in the southern Poland. The maximum noted temperature in the adhesive layer exceeded 70°C and was almost 10°C higher than measured together on concrete samples. This phenomena is caused by generally lower heat capacity and heat transfer ability of timber. The second part of the experiment consisted of bending tests of timber beams heated from the strengthened side with the use of linear infra-red radiators. When the temperature measured in the adhesive layer reached the 70°C beams were loaded to the moment of failure. Despite fears, such a temperature did not result in loss of adhesion and delamination of overlays. Only a slight decrease of stiffness and consequently the strengthening effectiveness was observed. It means that CFRP strengthening of timber elements, which could be subjected to direct sun exposition should be protected by additional layer of thermal insulation able to reflect the infra-red radiation
Authors and Affiliations
Rafał Krzywoń, Marcin Górski, Szymon Dawczyński
Keywords
Related Articles
- EP ID EP355985
- DOI -
- Views 83
- Downloads 0
Changes of cellulose crystallinity determined microscopically in polarised light
Changes of cellulose crystallinity determined microscopically in polarised light In the course of estimating the changes of cellulose crystallinity in wood decayed by two fungi species Trametes versicolor and Coniophora...
Comparative analysis of compression and buckling of European beech wood (Fagus sylvatica L.)
Beech wood is a material whose importance in the wood industry is growing. In the manufacture of many different products, e.g. frame furniture, it is essential to know the compressive strength in connection with buckling...
The technological parameters of medium-size raw material for mechanical processing
The technological parameters of medium-size raw material for mechanical processing. It is possible to use some sorts of medium-size raw material and obtain parameters that meet the requirements for obtaining sawnwood. Th...
The study of chemical composition of juvenile poplar branches (Populus deltoides x maximowiczii)
The study of chemical composition of juvenile poplar branches (Populus deltoides x maximowiczii). The aim of this work was determination of chemical composition of the poplar annual shoots collected from a plantation ene...
Project of a lumbar area stiffness regulator for an upholstered bed enabling the minimization of the user’s discomfort
Project of a lumbar area stiffness regulator for an upholstered bed enabling the minimization of the user’s discomfort. The point of this research was creating of a solution for an upholstered bed base that would minimis...