本文關鍵詞：基于多元模糊評定的橋梁綜合地震易損性分析　出處：《振動工程學報》2017年02期 　論文類型：期刊論文

  更多相關文章： 地震易損性 連續(xù)梁橋 損傷 多元模糊評定 時變周期

【摘要】：傳統(tǒng)的鋼筋混凝土橋梁地震易損性分析一般只根據(jù)主要橋墩的截面曲率等參數(shù)進行評估,對橋梁動力特性演變和整體性能考慮不充分。闡述了通過對橋梁不同部位進行易損性分析進而實現(xiàn)綜合損傷評定的策略。從能量耗散角度論證損傷的形式和程度與結(jié)構(gòu)理想彈性變形能和實際彈塑性變形能之間的差異相關,建立基于滯回耗能差的橋墩損傷評價模型。提出基于多階周期的橋梁多維整體易損性分析方法。運用模糊數(shù)學中的綜合評判方法,結(jié)合基于位移的支座損傷分析、基于能量的橋墩損傷分析和基于周期的整體損傷分析,建立了能夠反映橋梁從細部到整體多層次損傷的多元模糊易損性分析方法。對算例橋梁進行多維增量動力分析和各級別的易損性分析,結(jié)果表明:基于多元模糊評定的橋梁地震易損性分析方法能準確細致地反映橋梁構(gòu)件和整體的動力特性的損傷演變過程,具有較好的準確性和實用性。
[Abstract]:The traditional seismic vulnerability analysis of reinforced concrete bridges is generally based on the parameters such as the sectional curvature of the main piers. The evolution of the dynamic characteristics and the overall performance of the bridge are not sufficiently considered. The strategy of comprehensive damage assessment by analyzing the vulnerability of different parts of the bridge is expounded. The form and extent of the damage are demonstrated from the point of view of energy dissipation. It is related to the difference between the ideal elastic deformation energy and the actual elastoplastic deformation energy of the structure. The damage evaluation model of bridge pier based on hysteretic energy difference is established. The multi-dimensional global vulnerability analysis method based on multi-order period is proposed. The comprehensive evaluation method in fuzzy mathematics is used. Combined with displacement-based support damage analysis, energy-based pier damage analysis and period based global damage analysis. The multivariate fuzzy vulnerability analysis method which can reflect the multi-level damage of bridge from detail to whole is established. The multi-dimensional incremental dynamic analysis and vulnerability analysis of each grade of bridge are carried out. The results show that the seismic vulnerability analysis method based on multivariate fuzzy evaluation can accurately and meticulously reflect the damage evolution process of the dynamic characteristics of the bridge members and the whole structure, and has good accuracy and practicability.
【作者單位】： 北京工業(yè)大學工程抗震與結(jié)構(gòu)診治北京市重點實驗室;中國建筑科學研究院建筑工程檢測中心;
【基金】：國家自然科學基金資助項目(51478024)
【分類號】：U442.55
【正文快照】： 引言橋梁是交通生命線工程的重要環(huán)節(jié),在以往的震害中,橋梁常常出現(xiàn)落梁、橋墩彎曲損傷和支座失效等局部破壞甚至整體嚴重倒塌,從而延誤抗震救援工作的開展,加劇人員傷亡與經(jīng)濟損失[1]。近年來,隨著非線性有限元分析方法的迅猛發(fā)展和基于性能的橋梁抗震設計思想和理論框架的不

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