Load-carrying capacity of steel-to-timber joints with a pretensioned bolt |
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Authors: | Ali Awaludin Takuro Hirai Toshiro Hayashikawa Yoshihisa Sasaki |
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Institution: | (1) Laboratory of Bridge and Structural Design Engineering, Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-Ku, Sapporo 060-8628, Japan;(2) Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan;(3) Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan |
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Abstract: | Previous experimental studies reported that bolt pretensioning greatly increases the initial stiffness and load-carrying capacity
of bolted joints. It is also a matter of great importance to structural designers to understand the effect of pretension on
the load-carrying capacities of bolted joints, and this study presents an extended yield model that considers the fastener’s
pretension force. In the extended yield model, the load-carrying capacity was defined as the load at a slip of 15 mm. The
ultimate fastener bending angle at the yielded cross section equivalent to this joint slip, which was affected by the fastener’s
axial force, was iteratively evaluated in numerical analyses. The introduction of bolt pretensioning largely increased the
joint slip resistance at initial loading, but it decreased the ultimate fastener bending angle. This decrease of fastener
bending angle resulted in a relatively low stiffness hardening (or secondary stiffness), which is caused by secondary axial
forces associated with embedment of steel plates into the wood member. Prediction was verified by the tests of 36 steel-to-timber
joints under three different pretension forces and two loading directions relative to the grain. Some of the observed load-carrying
capacities of the joints, particularly in loading perpendicular to the grain, however, were not as high as those expected
by the numerical analyses considering the given pretension forces. |
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Keywords: | Load-carrying capacity Pretensioned bolt Timber joint Yield model |
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