| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 94 === Post-tensioned (PT) steel beam to column connection constructed with friction devices (FDs) combines the characteristics of pre-stressed strands and frictional energy dissipating devices. Thus, the post-tensioned system possesses re-centering capability from the pre-stressed strands while dissipating seismic energy in the beam web friction devices. This paper first derives the force-deformation relationships of the post-tensioned steel beam to column connection constructed with bolted web friction devices. The paper then describes the test program conducted in the National Center for Research on Earthquake Engineering on four bolted friction devices and four full-scale PT beam-to-column moment connection subassemblies. Tests confirm that (1) hysteretic behavior of four bolted friction devices is very stable, and the friction coefficient between the steel plate and the brass shim is about 0.34, (2) the proposed force-deformation relationships accurately predict the experimental responses of the PT connections under cyclically increasing deformations up to a peak beam rotation of 0.05 radians, (3) the PT connection using the FDs can be designed with a higher decompression moment than those using other type of metallic yielding energy-dissipating devices, (4) the decompression moments do not degrade as beam cyclic deformations increase. The paper concludes with the design recommendations for self-centering moment connections using friction devices.
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