考慮近斷層脈衝影響之隔震設計－以臺北盆地為例

Design of base-isolation systems subjected to pulse-like ground motions

10.6849/SE.202103_36(1).0003

楊甯凱(Ning-Kai Yang)；黃尹男(Yin-Nan Huang)；劉勛仁(Hsun-Jen Liu)；趙書賢(Shu-Hsien Chao)

近斷層地震 ； 隔震 ； 鉛心橡膠支承墊 ； 非線性動力歷時分析 ； 強地動模型 ； Near-Fault Ground Motions ； Base Isolation ； Lead-Rubber Bearings ； Non-Linear Response-History Analysis ； GMPE

結構工程

36卷1期（2021 / 03 / 01）

39 - 62

繁體中文

近斷層脈衝型震波因為含有中長週期速度脈衝，已為隔震結構之有效性帶來挑戰。然而台灣建築結構耐震設計規範並未提供具體作法來考慮脈衝型震波對隔震系統之影響，若因為脈衝型地震有可能造成隔震器過大位移而無法在近斷層區域採用，影響將十分重大。本文提出一套流程將脈衝型地震的影響合理地納入隔震系統之設計，此設計流程不更動現行法規要求，建議以現行耐震設計規範公告之設計反應譜進行隔震系統之初步設計，再輔以定值法建立之脈衝地震檢核反應譜以及適當選取之脈衝型地震紀錄，透過非線性動力歷時分析進行隔震系統及上部結構之性能檢核。本文並以一棟位於臺北盆地的15層韌性抗彎鋼構建築為例，考慮山腳斷層發生規模7.3並產生長週期脈衝之地震，說明如何以本文提出之流程進行隔震系統之設計，包括檢核反應譜之建立、地震紀錄之選取與縮放、以及隔震系統及上部結構之性能檢核。

Modernbuilding codes do not provide clearguidelineson the design of base-isolation systems against pulse-like ground motions, which may produce excessive displacement demand for isolators and endanger the systems. A procedureis proposed in this paper to address the impact of pulse-like ground motionson isolation systems. The procedure involves 1) the development of an ＂evaluation spectrum＂ using newly developed Taiwan ground motion prediction equations and a model for the ratio of spectral accelerations of pulse-like to non-pulse ground motions, and 2) selection and scaling of pulse-like records for nonlinear response-history analysis of the isolated building of interest. This paper presents an example of a 15-story steel special moment resisting frame isolated using lead-rubber bearings to demonstrate the proposed procedure.

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