本文關(guān)鍵詞：基于多元模糊評(píng)定的橋梁綜合地震易損性分析　出處：《振動(dòng)工程學(xué)報(bào)》2017年02期 　論文類(lèi)型：期刊論文

  更多相關(guān)文章： 地震易損性 連續(xù)梁橋 損傷 多元模糊評(píng)定 時(shí)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(jìn)行評(píng)估,對(duì)橋梁動(dòng)力特性演變和整體性能考慮不充分。闡述了通過(guò)對(duì)橋梁不同部位進(jìn)行易損性分析進(jìn)而實(shí)現(xiàn)綜合損傷評(píng)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(shí)際彈塑性變形能之間的差異相關(guān),建立基于滯回耗能差的橋墩損傷評(píng)價(jià)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(yùn)用模糊數(shù)學(xué)中的綜合評(píng)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(xì)部到整體多層次損傷的多元模糊易損性分析方法。對(duì)算例橋梁進(jìn)行多維增量動(dòng)力分析和各級(jí)別的易損性分析,結(jié)果表明:基于多元模糊評(píng)定的橋梁地震易損性分析方法能準(zhǔn)確細(xì)致地反映橋梁構(gòu)件和整體的動(dòng)力特性的損傷演變過(guò)程,具有較好的準(zhǔn)確性和實(shí)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(xué)工程抗震與結(jié)構(gòu)診治北京市重點(diǎn)實(shí)驗(yàn)室;中國(guó)建筑科學(xué)研究院建筑工程檢測(cè)中心;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51478024)
【分類(lèi)號(hào)】：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(yán)重倒塌,從而延誤抗震救援工作的開(kāi)展,加劇人員傷亡與經(jīng)濟(jì)損失[1]。近年來(lái),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(shè)計(jì)思想和理論框架的不

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