雙核心自復位斜撐與夾型挫屈束制斜撐對構架影響：耐震實驗與動力分析

Abstract

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，或是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，因此可以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，使得斜撐受軸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。 本研究承自2015年周中哲教授與研究生陳澤邦所做二層樓雙核心自復位斜撐構架(DC-SCBF)，將雙核心自復位斜撐(DC-SCB)與夾型挫屈束制斜撐(SBRB)放進同一個構架中變成特殊混合斜撐構架(SMBF)並測試其耐震與自復位能力，且與雙核心自復位斜撐構架(DC-SCBF)與夾型挫屈束制斜撐構架(SBRBF)做比較，本研究除了說明特殊混合斜撐構架(SMBF)與夾型挫屈束制斜撐構架(SBRBF)的設計流程外，以動力分析20組地震下此三組構架之反應，設計及試驗兩組斜撐構架試體。 研究目的在於探討特殊混合斜撐構架(SMBF)與雙核心自復位斜撐構架(DC-SCBF)以及夾型挫屈束制斜撐構架(SBRBF)之間差異以及兩種不同勁度的斜撐是否會對樓層產生影響。試驗結果顯示三組斜撐構架整體力學行為擁有良好的穩定性，斜撐皆不會破壞而且展現良好的耐震與消能能力。此外，本研究並利用非線性靜動態三維結構分析程式PISA 3D模擬三組斜撐構架試驗行為，分析顯示與試驗結果預測相符，證明此三組斜撐構架可利用非線性靜動態三維結構分析程式PISA 3D來進行研究與設計。

Dual-Core Self-Centering Brace (DC-SCB) uses tendons to constrain steel compression members and end 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-Restrianed Brace (SBRB) uses two identical restraining members that sandwich the Energy-Dissipative core with fully tensioned high-strength bolts to prevent core buckling and have stable hysteretic response.This research is based on Chou and Chen,2015 two story Dual-Core Self-Centering Brace Frame (DC-SCBF),change Dual-Core Self-Centering Brace (DC-SCB) in second floor into Sandwiched Buckling-Restrianed Brace (SBRB) that as known as Special Mixed Brace Frame (SMBF).Do seismic tests and time history tests then compare the result with Dual-Core Self-Centering Brace Frame (DC-SCBF) and Sandwiched Buckling-Restrianed Brace Frame (SBRBF).The objective of research is about two different stiffness braces use in a building,what kind of influence will happened to this building? compare the result with Dual-Core Self-Centering Brace Frame (DC-SCBF) and Sandwiched Buckling-Restrianed Brace Frame (SBRBF).The test results shows three braced frames have good seismic behavior,braces do not destroy and show good seismic behavior,too.This work study also uses the Platform of Inelastic Structural Analysis for 3D System software (PISA3D) to analyze the test of three frames and also compare with the test results and predictions which are proved similar.The analysis results shows three frames can use PISA3D software to do parametic study and design.