具變形放大消能器之斜撐構架耐震行為研究;Seismic Performance of A-Braced Frames with Amplified Deformation Steel Curved Dampers

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Title:	具變形放大消能器之斜撐構架耐震行為研究;Seismic Performance of A-Braced Frames with Amplified Deformation Steel Curved Dampers
Authors:	林光耀;Halim, Hendra
Contributors:	土木工程學系
Keywords:	曲線消能器;變形放大;耐震性能;能量消散;斜撐設計;Steel Curved Damper;A-Brace;Amplified Deformation;Seismic Performance;Energy Dissipation;Brace Design
Date:	2019-01-24
Issue Date:	2019-04-02 14:08:31 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究針對配置變形放大曲線消能器之鋼結構耐震性能進行評估，研究中使用不同尺度之曲線阻尼器製作斜撐(A-Brace)，並將之應用於結構設計。此設計中，藉由變形放大機制，在結構承受較小樓層位移比時，即可在阻尼器上造成倍數之變形，藉以在結構早期變形時有效消能。為驗證此設計之有效性，研究中首先針對配置不同尺度A-Brace之鋼構架進行一系列週期載重試驗，實驗結果顯示，此設計在位移放大機制作用下，結構在早期變形階段有效消散能量，結構之強度及勁度亦可因此設計而獲有效提升。另為進一步確認此新型設計在結構耐震設計之應用性，研究中亦選擇12個地震紀錄，進行結構動力分析，研究結果顯示，配置此變形放大曲線消能器之鋼構架在不同地震作用下之破壞，均可獲有效減低。上述研究結果顯示，變形放大曲線消能器可有效提升結構之強度、變形能力及能量消散能力，因此應為一有效之結構耐震效能提升設計。;This study focused on the performance evaluation of new A-Brace designs that adopted steel curved dampers (SCD) with amplified deformation mechanisms. The A-Brace was implemented in the strengthening scheme. The purpose of adopting A-Brace to the existing structure is to possess an allowable story drift and reduce the number of formation plastic hinges which might be occurred during major earthquake. The brace enhanced the lateral force resisting capacity and frame stiffness. The application was verified through experimental and numerical studies of the test frames. A series of cyclic load tests with various damper dimensions, subjected to cyclic increasing displacement histories, were conducted. It was confirmed experimentally that A-Brace started to dissipate energy in early deformation stage by amplifier mechanism and have large energy dissipation capacity. In the seismic evaluation, twelve earthquake ground motions were selected for time history analyses. A-Brace was modeled as kinematic link element based on multilinear force-displacement relationship obtained from finite element analysis. The results showed that significant improvement could be achieved by adding A-Brace to the existing steel moment frame. Therefore, the structural damages can be minimized. Simultaneous accomplishments in high strength, large deformation capability, and significant energy dissipation validated the applicability of the proposed A-Brace design to earthquake-resistant structural designs.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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