基于線剛度識別的鐵路橋梁下部結構服役性能動力評估方法
發(fā)布時間:2018-07-28 14:33
【摘要】:以下部結構實測整體或局部振動模態(tài)參數為目標值,采用模型修正技術和優(yōu)化計算方法識別墩身剛度和基礎約束剛度參數,進而計算橋墩橫橋向和順橋向水平線剛度。分析線剛度對橋墩各類病害的靈敏度,建立線剛度指數的概念,在此基礎上提出下部結構服役性能評估準則和評估流程。對某高速鐵路橋墩進行現場試驗,并依據設計規(guī)范和本文所提出的評估準則對其工作狀態(tài)進行評估。橋墩評估狀態(tài)與現場勘查結果相符,從而證明本文所提評估方法的準確性和可靠性。
[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】: 北京交通大學土木建筑工程學院;中國鐵路總公司科技管理部;
【基金】:國家自然科學基金(51678032) 國家重點基礎研究發(fā)展計劃(973計劃)(2013CB036203) 中國鐵路總公司科技研究開發(fā)計劃(2015G006-M)
【分類號】:U446
本文編號: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】: 北京交通大學土木建筑工程學院;中國鐵路總公司科技管理部;
【基金】:國家自然科學基金(51678032) 國家重點基礎研究發(fā)展計劃(973計劃)(2013CB036203) 中國鐵路總公司科技研究開發(fā)計劃(2015G006-M)
【分類號】:U446
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