Flexural behaviour and connection efficiency of cross-laminated timber–glulam composite floor systems

作者：Xiaoyue Zhang, Sigong Zhang, Binjie Niu, Huifeng Yang · 发表于：Structures · 年份：2025 · DOI：10.1016/j.istruc.2025.110204 · 被引用次数：4 · 研究领域：Wood Treatment and Properties、Structural Analysis of Composite Materials、Masonry and Concrete Structural Analysis

Driven by the growing demand for sustainable and high-performance construction, mass timber products are increasingly recognised for their potential in modern structural engineering. Recently, cross-laminated timber (CLT)–glulam composites are emerging as a promising solution for efficient and environmentally friendly long-span floor systems. However, the structural behaviour of CLT-glulam composites–particularly the performance of their shear connections remains insufficiently understood, often resulting in overly conservative designs. This study presents a comprehensive experimental investigation into the flexural behaviour of CLT–glulam composite floor assemblies through full-scale four-point bending tests. A range of connection systems were examined, including inclined and vertical self-tapping screws, perforated steel plates, and adhesive connections–representing both mechanical and hybrid connection systems. Detailed analyses of failure modes, load-deflection, and load-slip were conducted, alongside evaluations of strain distribution and composite efficiency. The results show that all assemblies exhibited brittle failure, characterised by a combination of tensile rupture, shear failure along the lamina, and delamination. The adhesive connections achieved full composite actions, though with sudden failure without prior sign. Assembly with 45° inclined self-tapping screws exhibited the highest load-bearing capacity and the second-highest stiffness. The addition of perfora...