【摘要】：橋梁結(jié)構(gòu)的健康監(jiān)測、損傷預(yù)后以及安全預(yù)后是當(dāng)前橋梁工程界的研究熱點(diǎn),建立一個準(zhǔn)確的、能同時兼顧結(jié)構(gòu)整體特性和局部細(xì)節(jié)特性的有限元模型是實(shí)現(xiàn)橋梁健康監(jiān)測目標(biāo)的有效手段之一。同時,為使建立的有限元模型能較好地反應(yīng)橋梁結(jié)構(gòu)的實(shí)際狀況,應(yīng)采用有效的模型修正技術(shù)來提高模擬精度,并考慮參數(shù)的不確定性對修正后的模型進(jìn)行確認(rèn)。本文以江蘇沿海高速(G15)灌河大橋(結(jié)合梁斜拉橋)為工程背景,建立灌河大橋多尺度模型,并對該多尺度模型進(jìn)行模型修正和確認(rèn),主要工作如下：1.對比分析材料多尺度模擬和結(jié)構(gòu)多尺度模擬的基本理論和方法,為實(shí)際結(jié)構(gòu)多尺度模擬提供參考。2.采用結(jié)構(gòu)多尺度模擬方法實(shí)現(xiàn)不同類型單元跨尺度的連接,從而建立灌河大橋初始多尺度有限元模型。3.通過分析灌河大橋多尺度模型的特點(diǎn)及誤差來源,基于多項(xiàng)式響應(yīng)面方法和支持向量回歸機(jī)方法建立兩階段模型修正的基本框架,開展灌河大橋多尺度模型修正。4.結(jié)合灌河大橋健康監(jiān)測系統(tǒng)實(shí)測數(shù)據(jù),從計(jì)算結(jié)果和試驗(yàn)結(jié)果相關(guān)性分析、不確定性正反向傳遞分析、模型有效性評估三方面進(jìn)行了灌河大橋多尺度模型確認(rèn)。得到的主要結(jié)論如下：1.本文借鑒材料多尺度模擬的思想,基于Arlequin結(jié)構(gòu)多尺度模擬方法建立了面向結(jié)構(gòu)健康監(jiān)測的灌河大橋多尺度有限元模型。2.提出了兩階段結(jié)構(gòu)多尺度模型修正方法,其中第一階段針對大尺度模型采用三階多項(xiàng)式響應(yīng)面方法進(jìn)行修正;第二階段針對實(shí)測數(shù)據(jù)分別采用三階多項(xiàng)式響應(yīng)面方法與支持向量回歸機(jī)方法進(jìn)行修正,兩種方法分別建立了正反向代理模型。兩階段修正后的灌河大橋多尺度模型的計(jì)算頻率與實(shí)測頻率之間的最大誤差由21%降低為3%。3.建立了多尺度模型確認(rèn)的基本框架,研究了參數(shù)不確定性的正反向傳遞規(guī)律。若不考慮均值誤差,正向傳遞時各階頻率的重合度指標(biāo)均大于75%,反向傳遞時各結(jié)構(gòu)參數(shù)的重合度指標(biāo)均大于65%。模型有效性評估結(jié)果表明修正后的灌河大橋多尺度模型在整個參數(shù)空間均具有較高精度,因此確認(rèn)后的灌河大橋多尺度模型可用于結(jié)構(gòu)損傷預(yù)后與安全預(yù)后分析。
[Abstract]:The health monitoring, injury prognosis and safety prognosis of bridge structure are the research hotspots in the field of bridge engineering at present. The establishment of an accurate finite element model which can take into account the overall and local details of the structure is one of the effective means to achieve the goal of bridge health monitoring. At the same time, in order to make the finite element model reflect the actual situation of the bridge structure, the effective model correction technique should be used to improve the simulation accuracy, and the uncertainty of the parameters should be taken into account to confirm the modified model. In this paper, based on the engineering background of Jiangsu Coastal Expressway (G15) Guanhe Bridge (combined beam cable-stayed bridge), the multi-scale model of Guanhe Bridge is established, and the multi-scale model is modified and confirmed. The main work is as follows: 1. The basic theories and methods of material multi-scale simulation and structure multi-scale simulation are compared and analyzed, which provides a reference for the actual structure multi-scale simulation. 2. The structural multi-scale simulation method is used to realize the cross-scale connection of different types of elements, and the initial multi-scale finite element model of Guanhe Bridge is established. Based on the analysis of the characteristics and error sources of the multi-scale model of Guanhe Bridge, the basic framework of two-stage model correction is established based on the multinomial response surface method and the support vector regression method, and the multi-scale model correction of Guanhe Bridge is carried out. 4. Combined with the measured data of the health monitoring system of Guanhe Bridge, the multi-scale model of Guanhe Bridge is confirmed from three aspects: the correlation analysis between the calculated results and the test results, the positive and negative transfer analysis of uncertainty, and the evaluation of the validity of the model. The main conclusions are as follows: 1. In this paper, based on the idea of material multi-scale simulation and Arlequin structure multi-scale simulation method, a multi-scale finite element model of Guanhe Bridge for structural health monitoring is established. 2. A two-stage structure multi-scale model correction method is proposed, in which the third-order polynomial response surface method is used to modify the large-scale model in the first stage, and the third-order multinomial response surface method and the support vector regression method are used to modify the measured data in the second stage, and the forward and backward proxy models are established by the two methods respectively. The maximum error between the calculated frequency and the measured frequency of the two-stage modified multi-scale model of Guanhe Bridge is reduced from 21% to 3%. The basic framework of multi-scale model confirmation is established, and the forward and backward transfer law of parameter uncertainty is studied. Without considering the mean error, the coincidence index of each order frequency is more than 75% in forward transmission and 65% in reverse transfer. The evaluation results of the validity of the model show that the modified multi-scale model of Guanhe Bridge has high accuracy in the whole parameter space, so the confirmed multi-scale model of Guanhe Bridge can be used to analyze the prognosis and safety prognosis of structural injury.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U448.27

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