a国产,中文字幕久久波多野结衣AV,欧美粗大猛烈老熟妇,女人av天堂

當(dāng)前位置:主頁(yè) > 科技論文 > 路橋論文 >

斜拉橋多尺度模型修正及模型確認(rèn)方法研究

發(fā)布時(shí)間:2019-06-16 17:49
【摘要】:橋梁結(jié)構(gòu)的健康監(jiān)測(cè)、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(gè)準(zhǔn)確的、能同時(shí)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(cè)目標(biāo)的有效手段之一。同時(shí),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(lái)提高模擬精度,并考慮參數(shù)的不確定性對(duì)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(duì)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(duì)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(guò)分析灌河大橋多尺度模型的特點(diǎn)及誤差來(lái)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(cè)系統(tǒng)實(shí)測(cè)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(píng)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(cè)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(duì)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(duì)實(shí)測(cè)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(cè)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(shí)各階頻率的重合度指標(biāo)均大于75%,反向傳遞時(shí)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(píng)估結(jié)果表明修正后的灌河大橋多尺度模型在整個(gè)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(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:U448.27

【相似文獻(xiàn)】

相關(guān)期刊論文 前8條

1 張令彌;計(jì)算仿真與模型確認(rèn)及在結(jié)構(gòu)環(huán)境與強(qiáng)度中的應(yīng)用[J];強(qiáng)度與環(huán)境;2002年02期

2 黃麗麗;韓景龍;員,|;;考慮氣動(dòng)不確定性的氣動(dòng)彈性系統(tǒng)模型確認(rèn)[J];航空學(xué)報(bào);2009年11期

3 呂劍,何穎波,陳成軍,鄧宏見;泰勒桿試驗(yàn)的動(dòng)態(tài)本構(gòu)模型確認(rèn)應(yīng)用研究[J];環(huán)境技術(shù);2005年02期

4 陳志國(guó);鄧忠民;畢司峰;;基于Monte Carlo法的結(jié)構(gòu)動(dòng)力學(xué)模型確認(rèn)[J];振動(dòng)與沖擊;2013年16期

5 朱躍;張令彌;郭勤濤;;基于SVR方法的有限元模型確認(rèn)中不確定性建模研究[J];振動(dòng)與沖擊;2010年09期

6 臧朝平;劉銀超;;軸對(duì)稱結(jié)構(gòu)的模態(tài)振型描述和模型確認(rèn)[J];南京航空航天大學(xué)學(xué)報(bào);2012年05期

7 張保強(qiáng);陳國(guó)平;郭勤濤;;模型確認(rèn)熱傳導(dǎo)挑戰(zhàn)問(wèn)題求解的貝葉斯方法[J];航空學(xué)報(bào);2011年07期

8 ;[J];;年期

相關(guān)碩士學(xué)位論文 前5條

1 劉琦齊;斜拉橋多尺度模型修正及模型確認(rèn)方法研究[D];東南大學(xué);2015年

2 黃麗麗;具有不確定性的飛機(jī)氣動(dòng)彈性系統(tǒng)模型確認(rèn)研究[D];南京航空航天大學(xué);2009年

3 劉銀超;矩函數(shù)在結(jié)構(gòu)動(dòng)力學(xué)模型確認(rèn)中的應(yīng)用[D];南京航空航天大學(xué);2012年

4 賈晴晴;基于矩函數(shù)的結(jié)構(gòu)動(dòng)力學(xué)模型確認(rèn)方法研究[D];南京航空航天大學(xué);2012年

5 李同玉;電子設(shè)備環(huán)境振動(dòng)仿真分析及其模型確認(rèn)研究[D];南京航空航天大學(xué);2014年

,

本文編號(hào):2500706

資料下載
論文發(fā)表

本文鏈接:http://www.wukwdryxk.cn/kejilunwen/daoluqiaoliang/2500706.html


Copyright(c)文論論文網(wǎng)All Rights Reserved | 網(wǎng)站地圖 |

版權(quán)申明:資料由用戶fcc51***提供,本站僅收錄摘要或目錄,作者需要?jiǎng)h除請(qǐng)E-mail郵箱bigeng88@qq.com
国产午夜激无码av毛片| 亚洲第一a| 无码人妻精品一区二区三区免费| 日韩天堂| 欧美激情精品| 酒店操美女国产精品久久久久| 亚洲人成网站在线观看69影院| 久久久受WWW免费人成| 午夜爽爽爽男女免费观看影院| 光山县| 日本亚洲最大的色成网站www| 久久字幕| 久久久xxx| 七七88色| 要久久爱免费观看| 欧美精品一区二区三区在线| 极品白嫩的小少妇| 国产精品无码久久AV不卡| EEUSS鲁片一区二区三区| 欧美黑吊粗大猛烈18p| 武夷山市| 洪江市| 精品久久久久久久一区二区| 国产精品v亚洲精品v日韩精品| 免费久久久78色少妇| 美女91| 国产69精品久久久久久| 欧美成人黄色| 欧洲激情| 国产伦精品一区二区三区免费| 国色天香十七区品质怎么样| 搡老熟女老女人一区二区| 欧美日韩av| 91综合网| 少妇高潮喷水久久久影院| 一区二区亚洲精品精华液| 天天都需要你爱| 国产91精品一区二区绿帽| 夜色88v精品国产亚洲av小说| 日韩一区中文字幕| 国语自产偷拍精品视频偷拍图片|