Experimental Response of Post-tensioned Steel Beam to Column Connection
Date Issued
2005
Date
2005
Author(s)
Yang, Wen-Chia
DOI
zh-TW
Abstract
Post-tensioned pre-stressed system (PT system) combines the characteristics of pre-stressed strands and energy-dissipating (ED) devices. Thus, the system possesses re-centering capability from the pre-stressed strands and while dissipating energy in the ED devices. In recent years, the PT system has gained notable applications in US and Japan. A NEES-SG research program was funded for a group of professors from Lehigh, Princeton and Purdue Universities. A combined experimental and analytical three-year joint research effort involving many university professors was also launched in 2004 in the Taiwan National Center for Research on Earthquake Engineering (NCREE).
This report first introduces the characteristics and behaviors of PT system, then describes three full scale PT connection specimens tested in NCREE. The steel PT beam-to-column connection details incorporate the beam flange cover plate stiffeners, buckling restrained steel rod ED devices and stiffened shear tab and beam-web joints. The main findings from the PT connection tests include: 1) the out-of-plane movement of the beam members observed in the tests can be mitigated by adding restraining stiffeners in the bolted beam web joint, 2) the residual compressive forces in the ED bars reduce the flexural strength of PT connections, it also reduces the decompression moment by as much as 70%, 3) the effects of the concrete slab on the re-centering characteristics can be eliminated by proper cutting the slab section at the column centerline perpendicular to the longitudinal axis of the PT beams.
Subjects
預力接頭
自行復位
實尺寸試驗
post-tensioned connection
re-centering
Type
thesis
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