台北盆地之基本振動週期與設計震譜

The Vibration Periods and Design Spectra of Taipei Basin

陳希舜(Shi-Shuenn Chen) ； 王富貞(Fu-Lang Wang) ； 徐偉朝(Wei-Chao Hsu)

《建築學報》 33期 (2000/07) Pp. 103-118

https://doi.org/10.6377/JA.200007.0103

摘要

本研究以台北盆地過去所發生之地震及土層資料，利用波傳理論，探討台北盆地地盤之振動週期，並根據地盤特性，研製台北盆地考慮地盤影響之設計震譜。研究結果顯示，台北盆地之基本振動週期隨卵石層深度改變，當卵石層深度介於30至70公尺時，其振動週期約為0.92±0.11秒，而當卵石層深度超過80公尺時，其振動週期則可能超過1.5秒；因卵石層深度對台北盆地土層之動態反應有很大之影響，於進行耐震設計時，應依工址地盤狀況慎選合適之設計震譜，以確保結構物耐震設計之安全。

關鍵字

設計震譜 ； 振動週期 ； 耐震設計 ； 動態分析

並列摘要

This study uses earthquake records and soil profiles of Taipei basin to investigate the vibration periods and develop the design spectra in Taipei basin by wave propagation theory. The results show that the fundamental vibration period of Taipei basin changes with the depth of the gravelly layer and is about 0.92±0.11 seconds when the gravelly layer is lying between 30 to 70 meters deep while the vibration period might exceed 1.5 seconds as the gravelly layer is deeper than 80 meters. Therefore， it is necessary to choose appropriate design spectra for seismic design based on the site conditions to ensure the safety of structures.

並列關鍵字

design spectra ； vibration period ； seismic design dynamic analysis

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