評估抗彎構架跨數對斜撐構架之耐震性能:挫屈束制與自復位斜撐震動台試驗與分析

Evaluating the Number of MRF Bays on Seismic Performance of Braced Frames: Shake Table Tests and Analyses of SBRB and DC-SCB

林春霖(Chun-Lin Lin)

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(2018年)

https://doi.org/10.6342/NTU201800462

摘要

雙核心自復位斜撐(Dual-Core Self-Centering Brace, DC-SCB)是利用斜撐中拉力構件連接斜撐中的鋼受壓構件與內外端板，並在斜撐受軸拉與軸壓下提供自復位能力。在拉力構件相同應變下，雙核心自復位斜撐的變形量可以達到傳統單核心自復位斜撐的兩倍變形量，或在相同斜撐變形量下，雙核心自復位斜撐拉力構件應變為傳統單核心自復位斜撐拉力構件應變的一半，因此可有效降低拉力構件彈性應變需求。夾型挫屈束制斜撐(Sandwiched Buckling-Restrained Brace, SBRB)是利用高強度螺栓將兩組獨立的圍束單元與核心消能構件夾合在一起，使斜撐受壓下不會挫屈而產生與傳統挫屈束制斜撐一樣的消能行為。
斜撐構架中在過去試驗與分析皆為探討單跨之耐震行為，本研究期望能去探討若增加了不同跨數的抗彎構架是否會對斜撐構架在耐震行為上有不同的表現，並設計了總共14組的斜撐構架進行動力分析比較，分析結果顯示在最大層間位移角並沒有明顯的差異，在殘餘變形上雙核心自復位斜撐(DC-SCB)明顯小於夾型挫屈束制斜撐(SBRB)，在最大樓層加速度則顯示了隨著跨數減少有越來越大的反應趨勢。
本研究並進行了兩組的斜撐構架震動台試驗與分析，確認斜撐模擬在動力分析下是否與震動台試驗吻合，證明上述14組斜撐構架之動力分析結果之正確性。

關鍵字

雙核心自復位斜撐 ； 夾型挫屈束制斜撐 ； 抗彎構架跨數 ； 震動台試驗 ； 耐震分析

並列摘要

Dual-Core Self-Centering Brace (DC-SCB) uses tendons to constrain steel compression members and ened plates of the brace, on the same time, it provides self-centering properties under brace in tension and compression that is stored to zero residual deformation. Under same strain of tendons, dual-core SCB has two times brace deformation capacity than conventional single-core SCB (or reduce to half the additional strain of tendons under same brace deformation capacity), that effectively reduce the elastic strain demand of tendons. Sandwiched Buckling-Restrained Brace (SBRB) uses two identical restraing members that sandwich the Energy-Dissipative core with fully tensioned high-strength bolts to prevent core buckling and have stable hysteretic response.
In the past, the tests and analyzes in the braced frames are all aimed at exploring the seismic behavior of single span. The purpose of this study is to investigate wherher the seismic behavior of the braced frames will have different performance if the moment frames with different bays are added, 14 braced frames were designed for dynamic analysis. The results show that there is no significant difference between the maximum story drift, but in the residual deformation , the dual-core SCB are less than the SBRB. At maximum story acceleration, the response shows a growing trend of reaction with decreasing bays.
In this study, two braced frames did shake table tests and analyses, confirming whether the simulation of brace is consistent with the shaking table test under dynamic analysis. Prove the correctness of the dynamic analysis results of the above-mentioned 14 braced frames.

並列關鍵字

Dual-Core Self-Centering Brace (DC-SCB) ； Sandwiched Buckling-Restrained Brace (SBRB) ； Number of Moment Frame Bays ； Shake Table Tests ； Seismic Analyses

參考文獻

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