側推分析暨F_u-R-T法於橋梁耐震評估強化及其演算法之建議

Recommendations of Pushover Analysis and F_u-R-T method for Bridge Seismic Capacity Evaluation and its Algorithm

10.6849/SE.202109_36(3).0006

曾榮川(Dzong-Chwang Dzeng)；黃鎮齊(Chen-Chi Huang)；劉靖俞(Ching-Yu Liu)；周贊翔(Tsan-Hsiang Chou)

動力歷時分析 ； 側推分析 ； 容量曲線 ； 容量譜曲線 ； 雙線性化 ； EPA（有效最大地表加速度） ； dynamic time history analysis ； pushover analysis ； capacity curve ； capacity spectrum curve ； bi-linearization ； EPA (Effective Peak Acceleration)

結構工程

36卷3期（2021 / 09 / 01）

111 - 135

繁體中文

側推分析暨F_u‐R‐T法目前為國內橋梁耐震能力檢核或評估所普遍採用，但在實務應用上仍有多方面待檢討釐清及擴充強化，以進一步了解此方法的適用性及變異性，確保分析評估結果的可靠度。本文提出了對水平譜加速度係數短、中週期分界T_0的擴充，以及求得譜位移S_d對應之EPA（有效最大地表加速度）的演算法，建立連續的EPA與受力狀況（如位移、塑鉸韌性比等）曲線，並經由規則橋梁簡化模型的案例分析，與非線性動力歷時分析結果比較檢討，確認其適用性與可靠度。利用此一連續的EPA與受力狀況曲線，結合橋址處的地震危害度，可作為量化計算橋梁震害風險成本或補強效益的依據基礎。除此外，本文也針對容量譜曲線雙線性化方法的研析檢討，證明了採用「非彈塑性雙線性化」方法，將會得到較「彈塑性雙線性化」方法為高的橋梁耐震能力，且有相當幅度，在實務應用上須謹慎注意。

While the approach combined pushover analysis with F_u-R-T process is universally adopted in examination and evaluation of seismic capacity for domestic bridge, there are still many aspects to be reviewed, clarified, expanded and improved to further recognize its applicability and variation and to ensure the reliability of the analyzed results. This work presents an algorithm expanding the period T_0 at the end of constant spetral design acceleration plateau to obtain the ������������ (effective peak acceleration) corresponding to any spectrum displacement S_d ), establishing the continuous ������������ and load condition curve (e.g. displacement and plastic hinge ductility ratio) and verifying its applicability and reliability by comparing the results of simplified regular bridge model analysis with nonlinear dynamic time-history analysis. Combining this continuous EPA and load condition curve with seismic hazard at bridge site, it could be the basis for quantified calculation of bride seismic risk costs and the benefits of retrofit. In addition, this work also studies and reviews the bi-linearization method of capacity spectrum curve. It proves that a much greater seismic capacity would be obtained by the ＂non-elastoplastic bi-linearization method＂ than the ＂elastoplastic bi-linearization method＂ . It should be cautious in practical applications.

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