搖擺控制機制橋柱之實驗與模擬

可搖擺式柱與基礎設計在反覆載重下的消能效果有賴於其接合之消能元件，預鑄構件雖具有高品質之優點，但消能元件之接合性或其消能元件若無法發揮消能能力，對於結構之承載能力將會大打折扣。為達到小震不壞、中震可修、大震不倒之目標，本研究提出一個柱與基礎之設計，首先針對外置消能棒的單向承載行為做探討，在安置於可搖擺式柱與基礎做結合觀察各部件之反應，最後使用SAP 2000進行參數分析，界定有效之模擬設計細節，用以探討本研究設計之柱與基礎在擬動態載重下之行為以及使用不同外置消能棒尺寸對整體反應的影響。研究結果顯示本研究設計之柱與基礎搭配外置消能棒能達到預期的消能能力，而外置消能棒破壞模式大多為拉斷而非挫屈。此外，本研究之柱底倒角之設計可有效的降低柱軆在搖擺機制下，柱軆保護層所會造成的碎裂破壞；且在柱與基礎交界加入橡膠後，相較無加入橡膠之柱軆，柱軆遲滯迴圈面積與最大側向外力更為優良，且柱體構件也無顯著之開裂。最後利用實驗數據推估SAP 2000模擬所需之細部參數，再使用SAP 2000模擬柱軆與不同尺寸之外置消能棒，以數值模擬的方式找出外置消能棒最佳之長度與直徑比。

關鍵字

消能鋼棒；搖擺柱與基礎

並列摘要

To mitigate the column damage during seismic events and to reduce the recovery time after a major earthquake, a post-tensioned bridge column with a rocking interface above the foundation and externally-installed energy dissipation devices was proposed. The energy dissipation devices were specially designed to serve as fuse elements that can be easily replaced after yielding. In addition, a mechanical joint that can rotate freely in all directions was incorporated at one end of the dissipater to ensure bending was not transmitted into this device. To verify the seismic performance of the proposed system, two proposed specimens with different prestressing forces and design details in the rocking base were constructed and tested. From the experiments, it was found that the proposed post-tensioned specimens suffered minor damage after cyclic loadings. All of the damage was concentrated on the inelastic deformation that occurred at the external energy dissipaters. The ease of replacement for the external energy dissipaters was also confirmed. However, the stiffness of the proposed system was less than that of the conventional cast-in-place monolithic specimen. Finally, parametric study are performed using SAP 2000 to improve the designs of the externally-installed energy dissipation devices.

並列關鍵字

post-tensioned bridge column ； rocking ； fuse elements

參考文獻

14. 陳清泉 (1982)，「預鑄房屋有關耐震設計、施工及檢驗規範之調查及研究」，財團法人台灣營建研究中心。

12. 田正平 (2008)，「預力式預鑄鋼筋混凝土柱與基礎接合雙向乘載行為研究」，國立中央大學土木工程研究所，碩士論文

1. ACI. (1969). "Effect of steel strength and reinforcement ratio on the mode of failure and strain energy capacity of reinforced concrete beams." ACI Structural Journal, Vol 66, No 3, pp 165-173.

2. Christopoulos, C. , Filiatrault, A. , Uang, C. M. , Folz, B. (2002), “Posttensioned energy dissipating4 connections for moment-resisting steel frames”, Journal of Structural Engineering, September, Vol 128, No 9, pp. 1111-1120.

3. Sarti, F., Palermo, A. and Pampanin, S., (2016) “Fuse-type external replaceable dissipaters: Experimental program and numerical modeling”,Vol 142, No 12, 04016314.

國際替代計量

搖擺控制機制橋柱之實驗與模擬

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