人造地表加速度產生方法之改進與比較

Improvement and Comparison on Methods of Generating Artificial Ground Acceleration

黃百誼(Barry Huang) ； 洪李陵(Li-Ling Hong)

《中國土木水利工程學刊》 26卷1期 (2014/03) Pp. 51-59

https://doi.org/10.6652/JoCICHE.201403_26(1).0005

摘要

台灣的隔震和消能建築物日漸增多，以歷時分析進行設計成為必然趨勢，需輸入與設計震譜相符之人造地表加速度。在國內建築物耐震設計規範的規定下，本文分析比較幾種產生人造地表加速度的方法和結果。本文提出單一週期最大偏差修正法，採用不同週期和不同延時的各個修正歷時，加入實測地震紀錄中，產生與設計震譜相符的人造地表加速度，此法運算效率較高，且修正範圍和幅度也比較小。採用此方法時，建議修正歷時的阻尼比取為5%，離散週期間距取為建築物基本振動週期的1%，可使反應譜在國內建築物耐震設計規範的週期範圍內，滿足相符條件。

關鍵字

人造地表加速度 ； 設計震譜 ； 耐震設計規範

並列摘要

Base-isolated and energy-dissipated buildings in Taiwan have been gradually increased. It is necessary to design those buildings by using the time history analysis. For such an analysis, the inputs should be artificial ground accelerograms compatible with a design spectrum. Under the regulation of the domestic seismic design code, this article discusses several methods in generating the artificial ground acceleration, and then compares the results. The modification method proposed by this article, named single period with maximum deviation method, adds a number of time histories with different periods and durations to a real seismic record for generating the spectrumcompatible artificial ground acceleration. This method owns high operation efficiency to modify the real record with narrow duration and amplitude. In this method, it is suggested that the damping ratio of the modification time history is 5% and the period step is 1% of the fundamental vibration period of a building in order to satisfy the compatibility criteria in the specified period range.

並列關鍵字

artificial ground acceleration ； design spectrum ； seismic design code