2023 Volume 29 Issue 72 Pages 741-746
Pull-out fracture of lag-screw bolt is brittle and has a large dispersion in strength. therefore, the bucking of the pipe preceding the pull-out of the lag-screw bolt controls the strength and toughness of the joint. The pipe is sandwiched between the lag-screw bolts fixed to the base plate. The method of bucking the pipe has little dispersion, and the strength and toughness can be controlled by adjusting the thickness and length of the plate. The effect was confirmed by experiments. and it was also confirmed that once the maximum load is reached, it can be restored by exchanging the pipe.
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