基于動(dòng)力指紋的斜拉橋橋塔沖刷深度識(shí)別方法
本文選題:橋塔沖刷 + 斜拉橋 ; 參考:《湖南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年11期
【摘要】:提出了一種基于動(dòng)力指紋的斜拉橋橋塔沖刷深度識(shí)別方法.利用理論分析得到不同沖刷深度與所提出的動(dòng)力指紋之間的定量關(guān)系;進(jìn)而在常規(guī)橋梁檢測(cè)中得到橋梁野外狀態(tài)下的動(dòng)力特性實(shí)測(cè)數(shù)據(jù),通過反演分析利用預(yù)先得到的定量關(guān)系最終得到對(duì)應(yīng)的橋塔沖刷深度.為研究該方法的適用性與可行性,分別提出全橋固有頻率以及模態(tài)柔度位移兩種動(dòng)力指紋構(gòu)成形式,并基于寧波招寶山大橋(斜拉橋),采用數(shù)值仿真的手段,分析兩種動(dòng)力指紋與沖刷深度之間的定量關(guān)系特征.分析結(jié)果表明:通過跟蹤兩種動(dòng)力指紋變化情況,均可較好地對(duì)斜拉橋橋塔沖刷深度進(jìn)行定量識(shí)別;特別采用主梁豎彎振型或主塔橫彎振型構(gòu)建模態(tài)柔度位移指標(biāo)時(shí)可得到更為敏感的沖刷識(shí)別效果.該方法可借助常規(guī)橋梁檢測(cè)項(xiàng)目對(duì)橋塔沖刷狀態(tài)完成定性判斷及定量分析,具備計(jì)算邏輯嚴(yán)密、監(jiān)測(cè)設(shè)備經(jīng)濟(jì)性好、完全避免水下操作等特點(diǎn),在上部結(jié)構(gòu)動(dòng)力特征正確識(shí)別的基礎(chǔ)上,可實(shí)現(xiàn)斜拉橋橋塔沖刷深度的準(zhǔn)確預(yù)測(cè).
[Abstract]:A method for identifying the scour depth of a cable-stayed bridge tower based on dynamic fingerprint is proposed. The quantitative relationship between the different scour depth and the dynamic fingerprint is obtained by theoretical analysis, and the measured data of the dynamic characteristics in the field state of the bridge are obtained in the conventional bridge detection. Through inversion analysis, the corresponding scour depth of the bridge tower can be obtained by using the pre-obtained quantitative relationship. In order to study the applicability and feasibility of this method, two kinds of dynamic fingerprint forms, natural frequency and modal flexibility displacement, are put forward, and based on Ningbo Zhaobaoshan Bridge (cable-stayed bridge), numerical simulation is used. The quantitative relationship between the two dynamic fingerprints and the scour depth was analyzed. The results show that the scour depth of the tower of cable-stayed bridge can be quantitatively identified by tracking the changes of two kinds of dynamic fingerprints. In particular, a more sensitive scour identification effect can be obtained when the modal flexibility displacement index is constructed by using the vertical bending mode of the main beam or the transverse bending mode of the main tower. This method can be used for qualitative and quantitative analysis of the scour status of bridge tower with the help of conventional bridge inspection projects. The method has the advantages of tight calculation logic, good monitoring equipment economy and avoiding underwater operation completely. Based on the correct identification of the dynamic characteristics of the superstructure, the erosion depth of the tower of the cable-stayed bridge can be accurately predicted.
【作者單位】: 東南大學(xué)交通學(xué)院;亞利桑那州立大學(xué)可持續(xù)工程與建筑環(huán)境學(xué)院;交通運(yùn)輸部公路科學(xué)研究所;西安建筑科技大學(xué)土木工程學(xué)院;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(51208097) 交通運(yùn)輸部建設(shè)科技項(xiàng)目(2014 318J14 250) 江蘇省自然科學(xué)基金資助項(xiàng)目(BK20161417) 中央高;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(2242016R30023)~~
【分類號(hào)】:U448.27
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