含橡膠墊之自復位斜撐耐震性能：震動台試驗與動力分析

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。 雙核心自復位斜撐過去試驗皆為靜態試驗與擬動態試驗，並沒有在震動台上做動態試驗。本研究目的在於探討雙核心自復位斜撐在震動台動態試驗下的耐震行為，並加裝橡膠墊在雙核心自復位斜撐是否能降低其彈性勁度。 本研究進行了兩組的雙核心自復位斜撐構架震動台試驗，試驗結果顯示兩組斜撐構架在動態試驗下整體力學行為擁有良好性，斜撐皆沒有破壞並且展現良好的耐震與自復位能力，加裝橡膠墊確實能降低斜撐的彈性勁度。此外，並利用非線性靜動態三維結構分析程式PISA3D模擬這兩組斜撐構架試驗行為，分析預測顯示與試驗結果相符，證明可利用非線性靜動態三維結構分析程式PISA3D來研究與設計此兩組斜撐構架。

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. In the past, the tests in the dual-core SCB are static and pseudo-dynamic tests, and there are no any dynamic tests in the dual –core SCB on the shaking table. The purpose of this study is to investigate the seismic behavior of dual-core SCB in the test on the shaking table and whether the elastic stiffness of dual-core SCB will be reduced with rubber pad is added in the dual-core SCB. In this study, two dual-core SCB frames did shaking table tests. The test results show good seismic behavior in these two braced frames, the braces did not destroy and show good seismic and self-centering behavior; the elastic stiffness of dual-core SCB can be reduced with adding rubber in the brace. And use the Platform of Inelastic Structural Analysis for 3D System software (PISA3D) to analyze the behavior of the tests of two braced frames, the predictions of analyses compare with the test results which are proved similar. The analysis results show these two braced frames can use PISA3D software to do parametric study and design.