【摘要】：為提高橋墩沖刷深度監(jiān)測的經(jīng)濟(jì)性與便利性,提出一種基于動力特征識別的橋墩沖刷狀態(tài)分析理論。該理論首先基于結(jié)構(gòu)自振頻率與振型,對其合理篩選后轉(zhuǎn)換得到能反映橋梁狀態(tài)的結(jié)構(gòu)柔度矩陣,基于該結(jié)構(gòu)柔度矩陣得到反映關(guān)注方向結(jié)構(gòu)剛度的"計算結(jié)構(gòu)位移差",將其作為橋墩沖刷識別參數(shù)。進(jìn)而利用參數(shù)分析得到該沖刷識別參數(shù)與不同橋墩沖刷深度之間的理論定量關(guān)聯(lián),同時利用橋梁檢測時獲得的結(jié)構(gòu)實(shí)際動力特性和實(shí)際取值,以及預(yù)先得到的"計算結(jié)構(gòu)位移差"與沖刷深度之間的關(guān)系進(jìn)行反演計算,得到了橋墩沖刷此時的反演深度。最后以簡支梁橋?yàn)槭纠?基于American Petroleum Institute(API)規(guī)范所推薦的計算公式建立多方向的樁土彈簧模型,利用逐步移除相應(yīng)彈簧單元模擬橋墩沖刷行為,演示了所提出的基于動力特性識別的橋墩沖刷狀態(tài)分析理論的具體應(yīng)用方法與步驟,并給出該方法的應(yīng)用前提。研究結(jié)果表明:反演得到的橋墩沖刷深度具備一定的準(zhǔn)確性,而多橋墩之間的耦合性可利用擬合公式進(jìn)行修正;該方法可借助常規(guī)橋檢項(xiàng)目對橋墩沖刷狀態(tài)進(jìn)行定性及定量分析,具備計算邏輯嚴(yán)密準(zhǔn)確、監(jiān)測設(shè)備便利經(jīng)濟(jì)的優(yōu)點(diǎn),在動力特征準(zhǔn)確識別的基礎(chǔ)上,可準(zhǔn)確預(yù)測橋墩沖刷深度。
[Abstract]:In order to improve the economy and convenience of scour depth monitoring of bridge piers, a theory of analysis of pier scour state based on dynamic feature recognition is proposed. Firstly, based on the natural vibration frequency and mode shape of the structure, the flexibility matrix of the bridge can be obtained by the reasonable selection and conversion. Based on the flexibility matrix of the structure, the "calculation of structural displacement difference", which reflects the directional stiffness of the bridge, is obtained and used as the identification parameter of the bridge pier scour. Furthermore, the theoretical quantitative correlation between the scour identification parameters and the scour depth of different piers is obtained by using the parameter analysis. At the same time, the actual dynamic characteristics and the actual values of the structures obtained during the bridge detection are used. And the relationship between the calculated structural displacement difference and the scour depth is obtained in advance, and the inversion depth of the bridge pier erosion is obtained. Finally, taking simply supported beam bridge as an example, a multi-direction pile-soil spring model is established based on the formula recommended by American Petroleum Institute (API) Code, and the scour behavior of pier is simulated by removing the corresponding spring element step by step. The application method and steps of the theory of scour state analysis based on dynamic characteristic identification are demonstrated, and the application premise of this method is given. The results show that the depth of erosion of bridge piers obtained by inversion has certain accuracy, and the coupling between multiple piers can be modified by fitting formula. This method can be used for qualitative and quantitative analysis of the scour state of bridge piers with the help of conventional bridge inspection projects. It has the advantages of strict and accurate calculation logic, convenient economic monitoring equipment, and on the basis of accurate identification of dynamic characteristics, The erosion depth of bridge piers can be accurately predicted.
【作者單位】： 東南大學(xué)交通學(xué)院;同濟(jì)大學(xué)橋梁工程系;
【基金】：江蘇省自然科學(xué)基金項(xiàng)目(BK20161417) 交通運(yùn)輸部建設(shè)科技項(xiàng)目(2013 318 223 380,2014 318 J14 250) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(2242016R30023)
【分類號】：U442.32

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