Feasibility of improved slotted bolted connection for timber moment frames |
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Authors: | Yoshikazu Araki Toshiki Endo Manami Iwata |
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Institution: | 1.Department of Architecture and Architectural Engineering,Kyoto University,Katsura, Nishikyo, Kyoto,Japan |
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Abstract: | This note examines the feasibility of an improved slotted bolted connection for timber moment frames. In the improved connection,
steel tubes are inserted into drill holes in glulam and fixed to the glulam with resin injection. Aluminum splice plates with
curved slots, or curved elongated holes, are fastened mechanically by using high-strength bolts that go through the steel
tubes. Since the compression due to bolt tension is fully supported by the steel tubes, the reduction of bolt tension due
to shrinkage of the glulam can be avoided. The use of slotted aluminum splice plates allows stable energy dissipation due
to smooth sliding between the aluminum splice plates and the end surfaces of the steel tubes within the specified range of
rotation angle. Through quasistatic cyclic loading tests of two connection specimens, it was demonstrated that stable and
nearly rigid-plastic hysteresis loops were obtained whose equivalent viscous damping ratio was more than 30% in the range
of rotation angle close to or greater than 1/50 radian. Although further improvement is necessary, the experimental results
demonstrate the feasibility and potential of the present connection. |
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