Estimation of structural steel and concrete stocks and flows at urban scale-towards a prospective circular economy
Estimation of structural steel and concrete stocks and flows at urban scale-towards a prospective circular economy
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DOI：
10.1016/j.resconrec.2021.105821
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发表时间：
2021-08-12
影响因子：
13.2
通讯作者：
Wang, Yong
中科院分区：
文献类型：
--
作者：
Ajayebi, Atta;Hopkinson, Peter;Wang, Yong
建筑材料库存和流量的量化是评估与破坏性拆除相比在寿命结束时创造更高价值的潜力的关键第一阶段。钢和混凝土是最广泛使用的建筑材料之一，主要用于结构部件。这样的部件在设计、类型和尺寸上都有很大的变化。在缺乏城市规模的结构部件或建筑平面图的数字化模型的情况下，准确的评估依赖于现场检查或材料强度系数(MI)系数的建模，其差异可高达100倍。在这项研究中，我们通过开发一种依赖于建筑原型的方法来扩展以前的库存建模方法，并产生代表框架类型的钢和混凝土的MI系数，这些系数在时间上是显式的，在产品水平上是分解的。将该方法与现有的计算MI的常用方法进行了比较，验证了该方法的有效性。结合城市建筑的时空模型，将这两种方法的改进MI应用于英国的一个案例研究。多层建筑物内在用钢材和混凝土的总库存估计分别为81,000公吨和655,000立方米(3)。钢材和混凝土的库存是根据它们作为产品的功能分类的，例如钢梁和钢筋是不同的。随后，使用中库存的包含碳被计算为350kt CO(2)当量。结果表明，所提出的方法能够更细粒度地评估结构材料的含碳量。
Quantification of stocks and flows of construction materials is a key first stage in assessing the potential for creating higher value at end-of-life decisions compared to destructive demolition. Steel and concrete are amongst the most widely used construction materials primarily in structural components. Such components are highly variable in design, type, and dimensions. In the absence of urban-scale digitised models of structural components or building plans, accurate assessment relies on either onsite inspection or modelling by material intensity (MI) co-efficient which can vary by up to a factor of 100. In this study, we extend previous stock modelling approaches through the development of a method that relies on building archetypes and produces MI coefficients of steel and concrete that are representative of frame types, temporally explicit and disaggregated at product level. This is compared to the common existent method of calculating MI to demonstrate the capabilities of the proposed method. Coupled with a spatiotemporal model of urban buildings, the developed MI of both methods are applied to a case study in the UK. The total in-use stock of steel and concrete within multi-storey buildings is estimated at 81,000 tonnes and 655,000 m(3) respectively. The stocks of steel and concrete are disaggregated based on their functions as products, for instance steel beams are distinguished from reinforcement steel. Subsequently, the embodied carbon of the in-use stock is calculated as 350 kt CO(2)eq. The results show the proposed method enables a more granular assessment of the embodied carbon of the structural material quantities.