4.7 Article

Experimental and numerical study on the bending response of a prefabricated composite CLT-steel floor module

Journal

ENGINEERING STRUCTURES
Volume 260, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2022.114278

Keywords

Composite floors; Hybrid construction; Mass timber; Cross-laminated timber; Prefabricated construction; Low-carbon structures; Bending stiffness

Funding

  1. Government of British Columbia through a FII Wood First grant
  2. Natural Sciences and Engineering Research Council (NSERC) of Canada [RGPIN-2019-04530, DGECR-2019-00265]
  3. UBC four-year doctoral fellowship
  4. Laboratory of Materials and Structural Testing (LMST) of the University of Trento

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In this paper, a novel prefabricated CLT-steel composite floor module is investigated to assess its structural response to out-of-plane static loads. The results show that the floor attains a high level of composite efficiency and bending stiffness. However, further research is needed on the vibration, fire, and long-term behavior of this composite CLT-steel floor system.
Cross-laminated timber (CLT) is one of the most widely utilized mass timber products for floor construction given its sustainability, widespread availability, ease of fabrication and installation. Composite CLT-based assemblies are emerging alternatives to provide flooring systems with efficient design and optimal structural performance. In this paper, a novel prefabricated CLT-steel composite floor module is investigated. Its structural response to out-of-plane static loads is assessed via 6-point bending tests and 3D finite-element computational analysis. For simply supported conditions, the results of the investigation demonstrate that the floor attains a high level of composite efficiency (98%), and its bending stiffness is about 2.5 times those of its components combined. Within the design load range, the strain diagrams are linear and not affected by the discontinuous arrangement and variable spacing of the shear connectors. The composite floor module can reach large deflection without pre -mature failure in the elements or shear connectors, with plasticity developed in the cold-formed steel beams and a maximum attained load 3.8 times its ultimate limit state design load. The gravity design of the composite module is shown to be governed by its serviceability deflection requirements. However, knowledge gaps still exist on the vibration, fire, and long-term behaviour of this composite CLT-steel floor system.

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