Assessing effect of seismic risk and building site on carbon footprint of high-rise buildings

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Assessing effect of seismic risk and building site on carbon footprint of high-rise buildings

ارائه دهنده: Provider: mohamad javad jahani

اساتید راهنما: Supervisors: Seyed Mahdi Hosseinian (Ph. D)

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: javad tahrinezhad (Ph. D) and mohsen babaei(ph.D

زمان و تاریخ ارائه: Time and date of presentation: 2023/10/14

مکان ارائه: Place of presentation: seminar 1

چکیده: Abstract: Approximately 33% of the world's total greenhouse gases are attributed to the construction sector. A significant portion of these greenhouse gases is related to carbon emissions. Therefore, managing the amount of carbon generated due to the construction industry is considered a crucial matter. Carbon footprint serves as a suitable tool for managing carbon production in construction since it indicates the direct and indirect carbon intensities for any product or service. One of the notable sources of carbon emissions is the production of materials and the construction of tall buildings. This research aims to highlight the importance of the carbon footprint in selecting the structural specifications of tall buildings and evaluate the effects of building type, height, construction location, including seismicity and soil type, on the carbon footprint intensity using the proposed CFAA algorithm and the life cycle concept. A set of six buildings with steel and concrete structures constructed in areas with different seismicity and soil types were chosen to assess and calculate the carbon footprint of materials, transportation, and construction workshop. The results obtained in this research also demonstrated that the carbon footprint of construction materials, with over 87%, contributes the most to the carbon footprint intensity of building construction. Furthermore, transportation accounted for the least contribution to the carbon footprint intensity, with 6.50%. This value was reported as 6.40% for the construction workshop. The results indicated that the choice of building type has the most significant (38 kg/m²) and seismicity (12 kg/m²) has the least effect on increasing the carbon footprint intensity in the material consumption stage. Based on the obtained results, steel-framed buildings have a significant role in increasing the carbon footprint intensity compared to reinforced concrete buildings. This increase in carbon footprint intensity was estimated at about 11% (63 kg/m²). Therefore, it is recommended to use reinforced concrete structures instead of steel structures. Tall buildings have a higher carbon footprint intensity compared to mid-rise buildings, and with an increase in height in tall buildings, an approximate 22% increase (109 kg/m²) in carbon footprint intensity was reported. However, by replacing tall buildings with a number of mid-rise buildings, the carbon footprint intensity can be reduced by over 19% (158 kg/m²). Moreover, the results showed that tall buildings are more sensitive (over 16%) than mid-rise buildings to changes in the soil type, and in tall buildings, changing the soil type increased this value by about 11% (58 kg/m²). Additionally, constructing buildings in highly seismic areas resulted in an approximately 7% (38 kg/m²) higher carbon footprint intensity compared to areas with moderate seismicity. This increase was reported to be about 5.17% (93 kg/m²) compared to areas with average seismicity. In the transportation stage, the type of structure has the least impact, and the seismicity of the region (10.5 kg/m²) has the most significant impact on increasing this value. Moreover, in the construction workshop stage, the level of increase in carbon footprint intensity due to structural specifications, including the type of structure (30.5 kg/m²), was the highest, while height (9.2 kg/m²) was the least influential parameter reported. Thus, the choice of structure can have a significant impact on the carbon footprint in various stages of construction

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