Development of an Environmentally Friendly Steel Structural Framework: Evaluation of Bending Stiffness and Yield Bending Moment of Cross-Laminated Timber Slab–H-Shaped Steel Composite Beams for Component Reuse

Sachi Furukawa (), Ryohei Iwami and Yoshihiro Kimura
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Sachi Furukawa: Graduate School of Engineering, Osaka Metropolitan University, Osaka 558-8585, Japan
Ryohei Iwami: KEN KEN Co., Ltd., Tokyo 103-0012, Japan
Yoshihiro Kimura: Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

Sustainability, 2025, vol. 17, issue 5, 1-31

Abstract: The building and construction sector accounts for nearly 40% of global greenhouse gas emissions, with steel-framed buildings being a significant contributor due to high CO 2 emissions during production. To mitigate this issue, integrating Cross-Laminated Timber (CLT) into structural systems has emerged as a sustainable alternative. CLT, known for its carbon sequestration properties, offers an environmentally friendly replacement for reinforced-concrete slabs, particularly when paired with steel structures to enhance material reuse and reduce lifecycle impacts. This study focuses on hybrid systems combining H-shaped steel beams and CLT floor panels connected using high-strength friction bolts. A four-point bending test, simulating a secondary beam, was conducted, demonstrating that the composite effect significantly enhances flexural stiffness and strength. Additionally, a simplified method for evaluating the flexural stiffness and yielding strength of these composite beams, based on material and joint properties, was shown to successfully evaluate the test results.

Keywords: component reuse; steel structures; CLT floor panel; bolt friction joint (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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