En kapacitetsjämförelse mellan stålförstärktaträbalkar, limträ och konstruktionsvirke

Sammanfattning: Purpose: Throughout the years numerous studies have been made that concludes thatcombining steel and wood results in improved strength. Under optimal conditions woodis an effective structural material, as it’s both cheap and durable. Steel on the other handunder right circumstances has considerably higher strength than wood. To combinewood and steel has over the last years gathered more attention. Studies shows thathybrid structures can lead to an economical advantage when building multiple storeybuildings, as it can replace or complete pure steel frames. The purpose of this paper isto increase the knowledge and understanding of how steel and wood cooperate and tofind out the advantages and disadvantages of using a flitched beam, as well as compareit’s strength to structural wood and glulam.Method: The paper comprises a quantitative study with two different kinds of datacollection methods, Literature studies and calculations. The literature study consists ofscientific papers and papers published by known institutions and will help the paperanswer the first issue. The calculations has been made with the help of Tekla Tedds,which follows the Eurocode design principles. Which will help the authors answer bothof the papers issues.Findings: The paper has found that the flitch beam has improved strength overstructural wood and glulam, but a significantly higher price. The flitch beam also has amuch higher self weight than structural wood and glulam. The flitch beam can also spanlonger than structural wood and glulam with the same applied load.Implications: The study have concluded that it’s hard to motivate the usage of flitchedbeams in floor designs as they have such high price. The flitch beam has higher strengththan both structural wood and glulam. Which makes the flitch beam a good option asload bearing beam that requires slim dimensions. The added strength of the flitch beamcan motivate the high price under the right circumstances.Limitations: The paper has limited the calculations to an enclosed environment andwill not take moisture or any other type of exposure in to account, As a dry indoorenvironment is optimal for both steel and wood. The calculations the paper uses arebased on Eurocode and all other forms of dimension principles will not be taken intoaccount.