全尺寸二層樓雙核心自復位斜撐構架與夾型挫屈束制斜撐構架之耐震試驗與非線性動力歷時分析

Seismic Tests and Nonlinear Time History Analyses of Full-Scale Two-Story Steel Frames with DC-SCBs and SBRBs

周中哲(Chung-Che Chou) ； 蕭佳宏(Chia-Hung Hsiao) ； 陳澤邦(Ze-Bang Chen) ； 鍾秉庭(Ping-Ting Chung) ； 范廷海(Dinh-Hai Pham)

《結構工程》 32卷2期 (2017/06) Pp. 35-64

https://doi.org/10.6849/SE.201706_32(2).0002

摘要

雙核心自復位斜撐是利用斜撐中的兩組拉力構件束制斜撐中的三組鋼受壓構件，並利用第一核心構件與外層構件之相對位移進行摩擦消能，使斜撐受軸拉與軸壓下提供自復位及消能能力，即在大變形下具有回到零殘餘變形的能力；夾型挫屈束制斜撐則是利用兩組獨立分離的圍束構件以栓接方式束制斜撐中的核心構件，使得斜撐受壓不會挫屈而產生飽滿的遲滯消能。本研究主要目的為比較雙核心自復位斜撐與夾型挫屈束制斜撐安裝在相同梁柱構架下的影響，因此設計三組三層樓鋼造斜撐構架，分別為雙核心自復位斜撐構架(Dual-Core Self-Centering Braced Frame, DC-SCBF)、特殊混合斜撐構架(Special Mixed Braced Frame, SMBF)及夾型挫屈束制斜撐構架(Sandwiched Buckling-Restrained Braced Frame, SBRBF)，其中特殊混合斜撐構架之斜撐由雙核心自復位斜撐和夾型挫屈束制斜撐分別配置於不同樓層，目的是結合兩種不同力學行為的斜撐於單一構架中進行抗震。本研究以非線性側推及動力歷時分析三組斜撐構架在20組強地動地震紀錄下的反應，並於實驗室進行三組全尺寸二層樓鋼造斜撐構架試驗，目的為檢驗三組斜撐構架的側向勁度、能量消散、殘餘變位、累積韌性、等效阻尼比及耐震性能等抗震行為。

關鍵字

雙核心自復位斜撐 ； 夾型挫屈束制斜撐 ； 二層樓鋼構架試驗

並列摘要

Traditional seismic resisting systems in a large earthquake can experience significant damage and residual drifts due to energy dissipation of some structural members, which leads to difficult or expensive to repair after earthquakes. A steel dual-core self-centering brace (DC-SCB), which utilizes three steel bracing members, two friction devices, and two sets of tensioning elements that are in a parallel arrangement for doubling its axial deformation, has been proposed and validated to provide both the energy dissipation and self-centering properties to seismic resisting systems. A prototype three-story steel dual-core self-centering braced frame (DC-SCBF) was designed, and its full-scale one-bay DC-SCBF was tested to validate the system response. The DC-SCB was then replaced by the sandwiched buckling-restrained brace (SBRB) in a full-scale two-story frame, so the seismic performance of the DC-SCBF and the special mixed braced frame (SMBF) that has both the DC-SCB and SBRB in a frame could be evaluated. The full-scale two-story DC-SCBF, SMBF and BRBF subassembly specimen performed well up to an interstory drift of 2% after multiple tests. Nonlinear time history analyses were also performed on the prototype braced frames to obtain seismic demands.

並列關鍵字

Dual-core self-centering brace (DC-SCB) ； Sandwiched buckling-restrained brace (SBRB) ； Tests of two-story steel braced frames