Material nature versus structural nurture: the embodied carbon of fundamental structural elements.
Material nature versus structural nurture: the embodied carbon of fundamental structural elements.
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物质自然与结构培育：基本结构元素的体现碳。
DOI：
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发表时间：
2012
影响因子：
11.4
通讯作者：
Phil Purnell
中科院分区：
文献类型：
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作者：
Phil Purnell
建筑行业面临着减少 CO(2) 排放量的巨大立法压力。目前的重点是运营中的 CO(2) 排放，但随着这些排放量被强制减少，结构部件的隐含 CO(2)（主要归因于制造它们的材料）将变得更受关注。目前，选择最小化 CO(2) 的结构材料要么基于主观叙述论点，要么基于每单位体积或质量的 CO(2) 值。在这里我们证明这样的论点是无效的。我们发现，基本结构部件（简单梁和柱）的结构设计参数（尺寸、截面选择和承载能力）至少与材料选择一样重要，因为它们对每单位尺寸每单位承载能力所包含的 CO(2) 的影响，在材料选择内和材料选择之间可能会变化数十年。这一结果表明，依靠基于每单位体积或质量的 CO(2) 的明显客观分析不会得出最低碳解决方案；必须使用内含 CO(2) 的正确功能单位的正式定义。简而言之，绿色结构材料并不存在。
The construction industry is under considerable legislative pressure to reduce its CO(2) emissions. The current focus is on operational CO(2) emissions, but as these are compulsorily reduced, the embodied CO(2) of structural components, overwhelmingly attributable to the material from which they are manufactured, will become of greater interest. Choice of structural materials for minimal embodied CO(2) is currently based either on subjective narrative arguments, or values of embodied CO(2) per unit volume or mass. Here we show that such arguments are invalid. We found that structural design parameters (dimensions, section choice, and load capacity) for fundamental structural components (simple beams and columns) are at least as important as material choice with regard to their effect on embodied CO(2) per unit load capacity per unit dimension, which can vary over several decades within and between material choices. This result demonstrates that relying on apparently objective analyses based on embodied CO(2) per unit volume or mass will not lead to minimum carbon solutions; a formal definition of the correct functional unit for embodied CO(2) must be used. In short, there is no such thing as a green structural material.