應用槓桿機制放大阻尼器變形以提升斜撐構架耐震性能之研究;Evaluation and Enhancement on the Seismic Performance of Framed Structures with Amplified-Deformation Lever-Armed Damper in Braces

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题名:	應用槓桿機制放大阻尼器變形以提升斜撐構架耐震性能之研究;Evaluation and Enhancement on the Seismic Performance of Framed Structures with Amplified-Deformation Lever-Armed Damper in Braces
作者:	艾譜圖;Sarassantika, I Putu Ellsa
贡献者:	土木工程學系
关键词:	槓桿臂阻尼器;變斷面消能板;反覆載重試驗;耐震性能;強健性;歷時反應;Lever-armed damper;Tapered energy dissipation plate;Cyclic load tests;Seismic performance;Resilience;Time-history response
日期:	2023-03-24
上传时间:	2024-09-19 14:11:56 (UTC+8)
出版者:	國立中央大學
摘要:	本研究的目的是開發和驗證一種新型的斜撐設計，以提高結構性能，此斜撐包括鉸接桿件和一組槓桿臂阻尼器 (LAD) ，稱為 LAD-Brace。槓桿臂阻尼器具有有效的旋轉機制，可在變斷面消能板中產生均勻的降伏區，並可藉由槓桿機制放大阻尼器變形。此設計中，消能板在反覆載重試驗和固定振幅下均可有效消散能量，提升斜撐之承載性能。此外，本研究亦針對應用LAD-Brace之構架在反覆載重及不同地震下之耐震性能，進行探討。試驗結果顯示，LAD-Braces 有效提高了結構的強度、等效黏滯阻尼、能量消散及強健性。本研究中另外使用 11 組不同的地震評估應用LAD-Brace之多跨、多層構架耐震行為。依據歷時反應分析結果可知，與對應的抗彎矩構架相比，應用LAD-Brace 之斜撐構架的最大層間位移和殘餘位移明顯減小， LAD 斜撐構架之基底剪力亦可保持在等於或小於相應之抗彎矩構架之值。前述結果顯示，使用 LAD-Brace 以提升構架耐震性能為一可行之設計。;The purpose of this research was to develop and validate a novel brace design for improving structural performance that included a hinged truss member and a set of lever-armed dampers (LAD), named the LAD-Brace. The lever-armed damper was created with an adequate rotation mechanism to produce uniform yield zones and amplified deformation in the tapered energy dissipation plate. The energy dissipation plates were used to test LAD-Braces with a variety of geometries under cyclic loads and constant peak amplitudes. On framed structures with and without LAD-Braces, cyclical loading tests and time-history response simulations using different earthquake ground motions were carried out. The test results were used to derive analytical expressions for yield strength estimation that were successfully validated. According to the test results, sufficient strength, efficient equivalent viscous damping, significant energy dissipation, and resilience were all attained at once. By using 11 different earthquake excitations, multi-bay, multi-story framed structural simulations were used to assess the applicability of the LAD-Brace structural system. The maximum story drifts and residual drifts of LAD-Braced frames were significantly less when compared to the corresponding SMRFs, according to the time-history structural responses. The LAD-Braced frame base shears were maintained at magnitudes equal to or less than the values of the corresponding SMRFs. This phenomenon, along with the significant decreases in story drifts and residual drifts, supported the use of LAD-Brace in the improvement of framed structural performance.
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