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IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints

IASS Symposium 2014

SESSION: Environmentally Compatible Structures

Carbon footprint based sustainable structural design of super tall buildings

< Table of Contents for Environmentally Compatible Structures
  • Proceedings Name: IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints
  • ISSN: (Electronic Version) 2518-6582
  • Session: Environmentally Compatible Structures
  • Title: Carbon footprint based sustainable structural design of super tall buildings
  • Author(s): Xin ZHAO, Shuo FANG
  • Keywords: Carbon footprint, Embodied carbon, Structural system comparison, Super tall buildings, Structural design, Sustainable design
A large number of super tall buildings have been built in China in recent years. Due to the huge quantity material and carbon assumption, the super tall buildings exert great impact on environment. This paper deals with the embodied carbon impacts of different structural systems of super tall building structures and relevant sustainable structural design methods. Embodied carbon is the main part of the carbon footprint that is mainly contributed by the building structure, and is an important tool to measure the environmental impacts of super tall buildings. Embodied carbon based design method is introduced. Benchmark values of embodied carbon in different areas are given. Design stages and relevant works are given, especially the work in concept design stage, which was the focus of the paper. Embodied carbon based structural system comparison of super tall buildings in the concept design stage is given. Different structural system of frame-core wall and tube-in-tube are established, designed and compared. Reference structures are established range from 200m to 300m. Different seismic fortification intensity of 6 degree, 7 degree (0.1g) and 8 degree (0.2g) of the site are considered respectively. Different structural materials of core wall, floor and frame are compared, including RC, steel, SRC (steel reinforced concrete) and CFT (concrete-filled tube). The embodied carbon of each structure is calculated according to material amount and ICE (Inventory of carbon and carbon) database in total, of the components and per net area. Economy considering emission reduction cost is considered and compared with pure economy. The results show that factors of structural system, height, seismic action and material composition have different impacts on the embodied carbon of total structural system and per net area. Emission reduction cost has effects on the total economy. A higher building can be sustainable as well. The comparison study shows that the embodied carbon is a powerful tool to guide the design of a more sustainable super tall building, especially in concept design stage.

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