自復位斜撐耐震性能研究

Seismic Performance of Re-Centering Brace

林敬傑(Ching-Chieh Lin)

指導教授 ： 蔡克銓

國立臺灣大學/工學院/土木工程學研究所/碩士(2007年)

https://doi.org/10.6342/NTU.2007.02151

摘要

自復位斜撐包含(1)預力元件，並施予預拉力；(2)斜撐在受拉或受壓時，預力元件均保持受拉狀態；(3)斜撐有軸向變形時能啟動消能元件的功能。本研究利用玻璃纖維初始預力提供斜撐自行復位能力，而利用摩擦消能裝置提供消能機制，設計此種自復位斜撐使其在建築結構系統受震時可具有自行復位、殘餘變位小及遲滯消能能力。
本研究研發出兩種自復位斜撐並探討自復位斜撐的特性及其力學行為。另外利用含長條孔摩擦消能裝置進行拉伸試驗、玻璃纖維拉伸試驗、及兩組縮尺自復位斜撐試驗，探討相關試驗規劃、分析與試驗結果。
本研究之主要結論為：(1)含長條孔摩擦消能裝置拉伸試驗得知由銅(C2680)跟鋼所組成的摩擦介面有穩定之遲滯行為，試驗顯示摩擦係數約為0.32；(2)直徑12.7mm玻璃纖維利用特殊夾頭能使的拉力強度由30kN上升至70kN左右，有效的提高拉力強度；(3)自復位斜撐試驗結果顯示本研究研發之斜撐有極大的拉壓差，自復位行為不夠理想，此與玻璃纖維的非軸力破壞有關；(4)本研究所提之理論方法能夠準確預測自復位斜撐勁度；(5)非線性結構系統動態反應歷時分析結果顯示含自復位斜撐之構架系統能有效的控制系統受震時樓層側位移角以及受震後的殘餘變形。

關鍵字

預力自動復位 ； 摩擦消能 ； 玻璃纖維 ； 非線性動力分析

並列摘要

Re-centering brace (RCB) comprises of (1) the tensioning element and subjected to the post-tensioned force (PT), (2) a mechanism that assures the elongation of the tensioning elements under both compressive and tensile brace forces and (3) a energy dissipating mechanism. Re-centering braces could be made by combining the characteristics of the glass fiber reinforced plastic (GFRP) and the friction devices (FDs). Thus, the post-tensioned system possesses re-centering capability from the pre-stressed GFRP while dissipating seismic energy in the friction devices.
This research proposes two types of re-centering braces. The force-deformation relationships of the re-centering braces are studied analytically first. Then the test results of the long slotted friction devices, GFRP tendons and two reduced scale re-centering braces are discussed in details.
Tests confirm that (1) hysteretic behavior of the long slotted friction devices is very stable. The friction coefficient between the steel plate and the brass (C2680) shim is about 0.32, (2) the special anchors attached to the 12.7mm diameter GFRP tendons imcrese the tendon tension strength from 30kN to 70kN, but the failure of the GFRP is still within the grip of the anchor, (3) the performance of the proposed RCBs is not satisfactory, and the RCBs failed at the GFRP anchor, (4) the stiffness of the RCBs can be accurately predicted, (5)Nonlinear time history analysis conducted on the moment resisting frame (MRF) and the re-centering braced frame (RCBF) confirmed that the RCBF (compared with MRF) can effectively reduce the inter-story drift and the residual deformation.

並列關鍵字

post-tension ； re-centering ； friction device ； GFRP ； nonlinear time history analysis

參考文獻

19. 蔡克銓、林錦隆(2006) 鋼造含摩擦型消能裝置預力梁柱接頭之耐震行為研究。國立台灣大學土木工程研究所碩士論文。

20. 蔡克銓、魏志毓(2006) 挫屈束制支撐局部挫屈與構架耐震效益分析研究。國立台灣大學土木工程研究所碩士論文。

21. 蔡克銓、莊勝智(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。

22. 蔡克銓、楊文嘉(2005) 鋼造預力梁柱接頭行為研究。國立台灣大學土木工程研究所碩士論文。

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