PULL-OUT BEHAVIOR OF CROSS-LAMINATED TIMBER CONNECTIONS USING STEEL RODS AND LAG SCREW BOLTS
Abstract
This paper investigates the use of Cross-Laminated Timber (CLT) as support members for seismic panel damper systems in steel-framed structures to promote the utilization of forest resources. Steel beams and CLT members are connected using lag screw bolts (LSBs) and hexagonal bolts to transfer tensile and shear forces. As the base ends of the CLT support members are subjected to tensile forces during seismic loading, it is necessary to evaluate the pull-out strength of the LSBs. Since the pull-out failure of LSBs exhibits brittle behavior, a connection method using steel rods as intermediaries was investigated. A reduced section in the shank of the steel rod promotes plastic deformation, thereby mitigating the brittle behavior of the LSBs. This study conducted pull-out tests to evaluate the tensile performance of the connection. The results indicated that specimens with a reduced section reached approximately 91% of the maximum strength of those without a reduced section, due to the decrease in the shank's cross-sectional area. In contrast, the deformation at the point of rod fracture increased by an average of 4.75 times, as the reduced section underwent significant plastic deformation. It was found that the plastic deformation of the reduced section prevents brittle pull-out failure of the LSBs, resulting in behavior characterized by enhanced deformation capacity.
Reference
Yo Kuratomi; Ryota Toyama; Daiju Mori. (2026). PULL-OUT BEHAVIOR OF CROSS-LAMINATED TIMBER CONNECTIONS USING STEEL RODS AND LAG SCREW BOLTS. Proceedings of International Structural Engineering and Construction. https://doi.org/10.14455/isec.2026.13(2).str-58
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