基于線(xiàn)剛度識(shí)別的鐵路橋梁下部結(jié)構(gòu)服役性能動(dòng)力評(píng)估方法
發(fā)布時(shí)間:2018-07-28 14:33
【摘要】:以下部結(jié)構(gòu)實(shí)測(cè)整體或局部振動(dòng)模態(tài)參數(shù)為目標(biāo)值,采用模型修正技術(shù)和優(yōu)化計(jì)算方法識(shí)別墩身剛度和基礎(chǔ)約束剛度參數(shù),進(jìn)而計(jì)算橋墩橫橋向和順橋向水平線(xiàn)剛度。分析線(xiàn)剛度對(duì)橋墩各類(lèi)病害的靈敏度,建立線(xiàn)剛度指數(shù)的概念,在此基礎(chǔ)上提出下部結(jié)構(gòu)服役性能評(píng)估準(zhǔn)則和評(píng)估流程。對(duì)某高速鐵路橋墩進(jìn)行現(xiàn)場(chǎng)試驗(yàn),并依據(jù)設(shè)計(jì)規(guī)范和本文所提出的評(píng)估準(zhǔn)則對(duì)其工作狀態(tài)進(jìn)行評(píng)估。橋墩評(píng)估狀態(tài)與現(xiàn)場(chǎng)勘查結(jié)果相符,從而證明本文所提評(píng)估方法的準(zhǔn)確性和可靠性。
[Abstract]:The whole or local vibration modal parameters of the following structures are measured as target values. The stiffness parameters of pier body and foundation constraint are identified by model modification technique and optimization calculation method, and then the horizontal stiffness of bridge piers in transverse direction and horizontal direction of forward bridge is calculated. The sensitivity of line stiffness to various defects of pier is analyzed and the concept of linear stiffness index is established. On this basis, the evaluation criteria and flow chart of service performance of substructure are proposed. Field test was carried out on the pier of a high speed railway, and its working condition was evaluated according to the design code and the evaluation criterion proposed in this paper. The evaluation state of bridge pier is consistent with the result of site survey, which proves the accuracy and reliability of the evaluation method proposed in this paper.
【作者單位】: 北京交通大學(xué)土木建筑工程學(xué)院;中國(guó)鐵路總公司科技管理部;
【基金】:國(guó)家自然科學(xué)基金(51678032) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)(2013CB036203) 中國(guó)鐵路總公司科技研究開(kāi)發(fā)計(jì)劃(2015G006-M)
【分類(lèi)號(hào)】:U446
本文編號(hào):2150542
[Abstract]:The whole or local vibration modal parameters of the following structures are measured as target values. The stiffness parameters of pier body and foundation constraint are identified by model modification technique and optimization calculation method, and then the horizontal stiffness of bridge piers in transverse direction and horizontal direction of forward bridge is calculated. The sensitivity of line stiffness to various defects of pier is analyzed and the concept of linear stiffness index is established. On this basis, the evaluation criteria and flow chart of service performance of substructure are proposed. Field test was carried out on the pier of a high speed railway, and its working condition was evaluated according to the design code and the evaluation criterion proposed in this paper. The evaluation state of bridge pier is consistent with the result of site survey, which proves the accuracy and reliability of the evaluation method proposed in this paper.
【作者單位】: 北京交通大學(xué)土木建筑工程學(xué)院;中國(guó)鐵路總公司科技管理部;
【基金】:國(guó)家自然科學(xué)基金(51678032) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)(2013CB036203) 中國(guó)鐵路總公司科技研究開(kāi)發(fā)計(jì)劃(2015G006-M)
【分類(lèi)號(hào)】:U446
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