鋼造預力梁柱接頭行為研究

Experimental Response of Post-tensioned Steel Beam to Column Connection

楊文嘉(Wen-Chia Yang)

指導教授 ： 蔡克銓

共同指導教授 ： 周中哲

國立臺灣大學/工學院/土木工程學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.00978

摘要

預力系統結合預力鋼腱與消能元件之特性，藉由鋼腱中之初始預力而具備自行覆位的能力，並藉由消能元件之降伏產生遲滯消能行為，因此整體預力式建築結構系統具有自行覆位、殘餘變位小及擁有遲滯消能的能力。近年來，預力系統在日本和美國逐漸被受重視，目前在台灣針對此類型結構的研究已有初步試驗結果及數值分析研究，並有為期三年的整合型研究專案於國家地震中心（NCREE）進行。
本文首先介紹預力結構系統的特性及其力學行為；接著敘述本研究中所進行之三座實尺寸預力接頭試驗之設計、經過與結果。實尺寸預力接頭試驗後主要結論有三：（1）預力接頭於面外之穩定性不佳，於梁接柱端會產生面外偏移，建議加上束制機制；（2）消能鋼棒之殘餘力會造成預力接頭之強度衰減，尤其會造成其解壓彎矩折減達七成左右；（3）將樓板系統於柱心處垂直梁軸向切開可使預力系統之反應機制正常運作。

關鍵字

預力接頭 ； 自行復位 ； 實尺寸試驗

並列摘要

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.

並列關鍵字

post-tensioned connection ； re-centering

參考文獻

20. 莊勝智、蔡克銓（2004），＂含三角形鋼板消能器與含預力構件構架耐震行為研究＂，國立台灣大學土木工程研究所碩士論文。

2. Christopoulos, C., Filiatrault, A., Uang, C. M., and Folz, B. (2002), “Posttensioned Energy Dissipating Connections for Moment-Resisting Steel Frames.”, Journal of Structure Engineering, Vol. 128, No. 9, pp.1111~1120, Sep. 2002.

3. Christopoulos, C., Filiatrault, A., and Folz, B., “Seismic Response of Self-Centring Hysteretic SDOF Systems.”, Earthquake Engineering and Structural Dynamics, Vol. 31, pp. 1131~1150, 2003.

4. Christopoulos, C., Pampanin, S. and Priestley, M. J. (2003) , “Performance-Based Seismic Response of Frame Structures Including Residual Deformations. Part I: Single-Degree of Freedom Systems. ”, Journal of Earthquake Engineering, Vol. 7, No. 1, pp. 97~118., 2003.

5. Chou, C. C., Chen, J. H., and Chen, C. Y. (2004). “Performance evaluation of post-tensioned steel connections for moment-resisting frames.” 6th Korea-Japan-Taiwan Joint Seminar on Earthquake Engineering for Building Structures, Taipei, Taiwan.