Jämförelse av olika stomsystem i ett flerbostadshus : En Fallstudie

Sammanfattning: In Sweden, the long-term climate goal is to achieve a net zero emission of greenhouse gases by 2045. At the same time, today the Swedish construction and property industry accounts for 21 percent of all greenhouse gas emissions, and the use of more climate-friendly materials can be part of the solution. The aim of the study is to analyze the climate impact and costs from a nine-floor building, where four different frame systems are compared. The nine-floor building is of a normal concrete frame with load-bearing steel columns in the outer walls. This building will then be compared against if the building was made of green climate-compensated concrete. As well as two hybrid solutions where the top three floors are dimensioned to a wooden frame and six floors in gray and green concrete below. In order to analyze the climate impact and costs, a life cycle analysis (LCA) and a life cycle cost analysis (LCC) will be carried out using the One Click LCA tool. In the life cycle analysis, the stages (A1-A5) will be studied and in the life cycle cost analysis the material costs (A1-A3) will be studied. The result from the life cycle analysis shows that the hybrid building with wood and green concrete has the lowest climate impact in terms of emissions of carbon dioxide equivalents (CO2e), followed by the building in green concrete. The result also shows that the hybrid building with wood and green concrete has approximately 43% lower climate impact compared to the gray concrete building which had the largest. The life cycle cost analysis shows that the gray concrete building has the lowest material costs, while the hybrid building with wood and green concrete has the highest. The conclusions of the study are that dimensioning a wooden frame meant thicker building parts compared to a concrete frame, which resulted in a smaller living area. But the hybrid buildings with three floors with a wooden frame, on the other hand, had a significantly smaller climate impact compared to the respective concrete building.