IOP Conference Series: Earth and Environmental Science Pub Date : 2020-11-21 , DOI: 10.1088/1755-1315/588/3/032028 J Helal 1 , A Stephan 2 , R H Crawford 3
The construction of tall buildings generates a high spatial and temporal concentration of greenhouse gas (GHG) emissions. Research has shown that as building height increases, more resources per floor area are required to withstand the increasing effects of wind and earthquake loads. This has major implications for the environmental performance of tall buildings since the embodied GHG emissions (EGHGE) of structural systems tend to represent the greatest portion of the life cycle GHG emissions of tall buildings. In mitigating the effects of climate change, life cycle assessment (LCA) has been proposed as an early stage design tool to facilitate the choice of structural systems for tall buildings. However, international standards on LCA do not specify which of the three main life cycle inventory (LCI) approaches to use - process analysis, environmentally-extended input-output analysis or hybrid analysis. The aim of this paper is to evaluate the influence of LCI approaches on the choice of structural systems for tall buildings to minimise their embodied GHG emissions.
The effects of LCI approaches on the choice of structural systems for tall buildings are evaluated using 10 tall buildings, ranging in height from 10 to 50 storeys, parametrically designed using finite element modelling. Two alternative structural systems are proposed and various LCI approaches are used to compare their EGHGE. The paper demonstrates that varying the LCI approach can significantly influence the values of EGHGE of structural systems for tall buildings by up to 116%. Notably, the paper demonstrates that, in minimising EGHGE, the adopted LCI approach can influence the choice of structural systems for tall buildings. The findings of this study confirm the need for clarity, transparency and comprehensiveness in the use of LCI approaches for comparative LCA studies, particularly in the structural design of tall buildings.
中文翻译:
生命周期清单方法对减少高层建筑隐含温室气体排放的结构系统选择的影响
高层建筑的建造会产生高空间和时间上的温室气体 (GHG) 排放浓度。研究表明,随着建筑高度的增加,每层建筑面积需要更多的资源来承受越来越大的风和地震载荷的影响。这对高层建筑的环境绩效具有重大影响,因为结构系统的隐含温室气体排放 (EGHGE) 往往代表了高层建筑生命周期温室气体排放的最大部分。为了减轻气候变化的影响,已提出生命周期评估 (LCA) 作为早期设计工具,以促进高层建筑结构系统的选择。然而,关于 LCA 的国际标准并未具体说明使用三种主要生命周期清单 (LCI) 方法中的哪一种——过程分析、环境扩展的投入产出分析或混合分析。本文的目的是评估 LCI 方法对高层建筑结构系统选择的影响,以尽量减少其隐含的温室气体排放。
LCI 方法对高层建筑结构系统选择的影响使用 10 座高层建筑进行评估,高度从 10 层到 50 层不等,使用有限元建模进行参数化设计。提出了两种替代结构系统,并使用各种 LCI 方法来比较它们的 EGHGE。该论文表明,改变 LCI 方法可以显着影响高层建筑结构系统的 EGHGE 值高达 116%。值得注意的是,该论文表明,在最小化 EGHGE 方面,采用的 LCI 方法可以影响高层建筑结构系统的选择。本研究的结果证实了在使用 LCI 方法进行比较 LCA 研究时需要清晰、透明和全面,特别是在高层建筑的结构设计中。