面內撓曲式拱型阻尼器之彈性力學理論與試驗

Abstract

本研究提出面內撓曲式拱形阻尼器作為建築抗震設計之用，並根據彈 性力學發展拱形阻尼器之線彈性分析理論，以估算阻尼器之初始勁度與降 伏強度。本文完成一系列足尺元件測試，結果顯示初始勁度之理論估算值 與元件試驗結果相當吻合，誤差約為5%，符合規範容許範圍(15%)。元件 測試所得之遲滯迴圈除因孔隙造成退縮之外，整體而言相當飽滿且穩定， 且與ANSYS 分析結果相當接近。此外，與門形阻尼器相較，拱形阻尼器 的應力分佈較為全面而均衡，材料利用效率較佳，不管是韌性抑或極限強 度等各方面之表現皆有顯著提升。拱形阻尼器之振動台耐震性能測試，證 明其具備相當優異之減震效能，結構加裝阻尼器後各模態之等效阻尼比隨 地震強度之增加而提升，符合非線性阻尼器之特徵。

This study proposes an in-plane flexural type damper referred to as the in-Plane Arched Dampers ( i-PAD ) for seismic design of buildings. A linear elastic theory based on elasticity is developed to estimate the initial stiffness and yield strength of the i-PAD. In this paper, a series of full-scale component tests has been conducted and the initial stiffness agrees very well with the theoretical prediction with a difference of 5% which is well within the allowable error of 15% by the code. The hysteresis loops from the component test are steady in repeated cycles and exhibit characteristics of fullness, except for some setback due to gap between the pin and drill hole. They are in good agreement with the ANSYS prediction. In addition, i-PAD shows a more comprehensive and balanced stress distribution pattern than that of the original iii in-Plane flexural damper in the shape of a portal frame, with a better efficiency on material utilization. As a result, the proposed damper is superior in the aspects of ductility and ultimate strength The seismic performance test of the proposed i-PAD shows excellent capability in dynamic response mitigation of the structure. With the dampers implemented, the effective damping ratios of the model structure increase with the earthquake intensity, consistent with the characteristics of nonlinear dampers.