Comparative life cycle assessment for two structural framing plan alternatives in a composite hybrid steel—cross laminated timber (CLT) building
複合ハイブリッド鉄骨—クロスラミネーテッドティンバー（CLT）建築における2つの構造フレーム計画案の比較ライフサイクルアセスメント (AI 翻訳)
Baiyu Chen, M. Eckelman, Michelle Laboy, Mark D Webster, Jerome F. Hajjar
🤖 gxceed AI 要約
日本語
この研究は、鉄骨とCLTの複合ハイブリッド構造における2つのフレーム計画（基本ハイブリッドとストレッチ）のライフサイクルアセスメントを実施。ストレッチ設計はバイオジェニック炭素貯蔵を含めると基本より83%高い炭素便益を示すが、森林再生によるオフセットには23年の運用期間が必要。建物全体のネットゼロ達成には5-plyシステムで80年、7-plyで67年と試算。
English
This study compares two structural framing plans (Basic Hybrid and Stretch) for steel-CLT composite hybrid buildings via life cycle assessment. The Stretch design shows 83% greater carbon benefit when including biogenic carbon storage, but requires 23 years of service for forest regrowth to offset initial forestry emissions. Net-zero for the whole building is achieved in 67 years for the 7-ply system vs. 80 years for the 5-ply system.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本では木造建築の推進が進んでおり、CLT利用の高層建築は政策課題。本論文は鉄骨とCLTのハイブリッド構造の炭素排出トレードオフを示し、設計判断に有用。
In the global GX context
This paper contributes to the growing body of LCA on timber-steel hybrid structures, highlighting trade-offs between span, material use, and biogenic carbon storage. Relevant for net-zero building design worldwide.
👥 読者別の含意
🔬研究者:Offers comparative LCA data for steel-CLT hybrid systems, useful for further optimization.
🏢実務担当者:Provides design guidance based on embodied carbon and payback period for biogenic carbon storage.
📄 Abstract（原文）
The construction industry is increasingly focused on reducing embodied carbon emissions to address climate change. Steel—cross laminated timber (CLT) composite hybrid structures, where CLT floors and steel framings work in composite action to resist gravity forces, offers benefits such as carbon storage, recyclability, reduced use of carbon-intensive materials, and improved project schedule and quality control. This composite hybrid system can accelerate progress toward net-zero embodied carbon by integrating carbon-storing materials within the existing AEC (Architecture, Engineering, and Construction) ecosystem for commercial and high-rise buildings, where timber use is limited. This study analyzes two structural patterns within the composite hybrid system and uses life cycle assessment (LCA) to identify trade-offs in embodied carbon. A 12-story office prototype is designed using two framing spans of 12.5 feet (3.8 m, Basic Hybrid) and 25 feet (7.6 m, Stretch), resulting in a change in the wood-to-steel ratio. In the Stretch design, the structure’s mass increases by 20% due to thicker CLT panels for the longer span, despite reduced steel framing, resulting in a 5% heavier foundation. The LCA considers upfront emissions from the product and transportation stages (A1–A4). Excluding biogenic carbon, the Stretch design has 3% higher embodied carbon than Basic Hybrid; however, including biogenic carbon storage shows an 83% greater carbon benefit for Stretch. A dynamic assessment of biogenic carbon storage reveals that the building must be in service for 23 years for forest regrowth to offset initial forestry emissions, while the 7-ply system achieves net-zero carbon for the whole building in 67 years, compared to 80 years for the 5-ply system.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.1088/2634-4505/ae368dfirst seen 2026-06-29 06:55:04
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