本文選題：斜拉橋懸臂拼裝 + 數(shù)字圖像檢測(cè)��； 參考：《廣州大學(xué)》2017年碩士論文

【摘要】：斜拉橋相對(duì)于普通橋梁而言,施工過(guò)程繁雜且受外界干擾性大,設(shè)計(jì)與施工耦合性強(qiáng),選擇合適的施工方法和制定合理的監(jiān)控方案對(duì)成橋線形和結(jié)構(gòu)受力起到至關(guān)重要的作用。懸臂拼裝是斜拉橋運(yùn)用最為廣泛的施工方法,但受施工過(guò)程中各種因素的影響,其結(jié)構(gòu)內(nèi)力及變形等變化規(guī)律較為復(fù)雜,為確保最終成橋線形和受力狀態(tài)最大限度滿足設(shè)計(jì)需求,施工控制尤為重要。傳統(tǒng)的橋梁懸臂施工控制方法既費(fèi)時(shí)費(fèi)力,自動(dòng)化程度又不高,很難達(dá)到理想的施工控制效果,本文在傳統(tǒng)施工控制方法的基礎(chǔ)上提出了“虛實(shí)結(jié)合”施工控制的技術(shù)理念,本技術(shù)理念是基于Matlab強(qiáng)大的圖像處理功能和系統(tǒng)自帶的虛擬仿真功能,即數(shù)字圖像邊緣檢測(cè)技術(shù)和虛擬現(xiàn)實(shí)技術(shù)。最后通過(guò)實(shí)驗(yàn)室自加工斜拉橋?qū)嵗齺?lái)驗(yàn)證“虛實(shí)結(jié)合”施工控制技術(shù)的可行性。主要研究?jī)?nèi)容及研究成果如下:(1)詳細(xì)介紹了數(shù)字圖像檢測(cè)技術(shù)的原理及實(shí)現(xiàn)方法,同時(shí)介紹了其在橋梁變形檢測(cè)方面較傳統(tǒng)測(cè)量方法的優(yōu)勢(shì),并成功的將其應(yīng)用在斜拉橋懸臂拼裝各工況的位移識(shí)別上,將其識(shí)別結(jié)果與理論計(jì)算數(shù)據(jù)進(jìn)行了對(duì)比分析,其變化趨勢(shì)基本一致。(2)對(duì)虛擬現(xiàn)實(shí)技術(shù)進(jìn)行了系統(tǒng)化研究,基于虛擬現(xiàn)實(shí)建模語(yǔ)言VRML建立虛擬現(xiàn)實(shí)仿真模型,通過(guò)Simulink動(dòng)態(tài)仿真建模語(yǔ)言實(shí)現(xiàn)仿真模型的動(dòng)態(tài)化;將實(shí)測(cè)結(jié)果與理論計(jì)算結(jié)果導(dǎo)入虛擬仿真環(huán)境,形象逼真的展示兩者之間的差異;通過(guò)參數(shù)敏感性分析來(lái)確定主要設(shè)計(jì)參數(shù),進(jìn)而對(duì)有限元模型進(jìn)行修正,得到準(zhǔn)確合理的斜拉橋變形數(shù)據(jù),為其施工控制提供了有效的數(shù)據(jù)參考。(3)基于數(shù)字圖像檢測(cè)技術(shù)、VRML虛擬建模技術(shù)、Simulink動(dòng)態(tài)仿真技術(shù)和有限元分析技術(shù),在傳統(tǒng)施工控制方法的基礎(chǔ)上提出了“虛實(shí)結(jié)合”施工控制的技術(shù)理念,將其試應(yīng)用在某斜拉橋懸臂拼裝施工控制中,取得了理想的控制效果,說(shuō)明此次虛實(shí)結(jié)合施工控制的初次探索取得的較好的控制效果,為將來(lái)該技術(shù)運(yùn)用到實(shí)際橋梁施工監(jiān)控中提供了一定的理論參考價(jià)值。實(shí)踐證明:基于數(shù)字圖像處理技術(shù)和虛擬現(xiàn)實(shí)技術(shù)的虛實(shí)結(jié)合施工控制技術(shù)理念是合理有效的,它可以直觀逼真的展現(xiàn)出施工控制各階段實(shí)測(cè)結(jié)果與理論結(jié)果之間的誤差,同時(shí)使兩者之間的誤差及時(shí)得到解決,并且其信息化和自動(dòng)化程度較高,為將來(lái)實(shí)際橋梁施工控制提供了一種行之有效的施工控制方法。
[Abstract]:Compared with ordinary bridges, cable-stayed bridges have complex construction process and strong coupling between design and construction. It is very important to select appropriate construction methods and establish reasonable monitoring schemes for bridge alignment and structural stress.Cantilever assembly is the most widely used construction method for cable-stayed bridges. However, due to the influence of various factors in the construction process, the internal force and deformation of the structure are complicated.Construction control is particularly important to ensure that the final bridge alignment and stress state meet the design requirements to the maximum extent.The traditional bridge cantilever construction control method is time-consuming and laborious, and the degree of automation is not high, so it is difficult to achieve the ideal construction control effect. Based on the traditional construction control method, this paper puts forward the technical concept of "virtual reality combination" construction control.The idea of this technology is based on the powerful image processing function of Matlab and the virtual simulation function of the system, that is, digital image edge detection technology and virtual reality technology.Finally, the feasibility of the construction control technology of "virtual reality combination" is verified by the example of laboratory self-processing cable-stayed bridge.The main research contents and results are as follows: (1) the principle and implementation method of digital image detection technology are introduced in detail. At the same time, its advantages in bridge deformation detection are also introduced.It has been successfully applied to the displacement identification of cable-stayed bridge cantilever assembly under various working conditions. The result of recognition is compared with the theoretical calculation data. The trend of the change is basically consistent with that of the virtual reality. (2) the virtual reality technology is systematically studied.The virtual reality simulation model is established based on virtual reality modeling language VRML, the dynamic simulation model is realized by Simulink dynamic simulation modeling language, the measured result and the theoretical calculation result are imported into the virtual simulation environment.Through parameter sensitivity analysis, the main design parameters are determined, and then the finite element model is modified to obtain accurate and reasonable deformation data of cable-stayed bridge.It provides effective data reference for construction control.) based on digital image detection technology, VRML virtual modeling technology, Simulink dynamic simulation technology and finite element analysis technology.Based on the traditional construction control method, the paper puts forward the technical idea of "virtual reality combination" construction control, and applies it to the cantilever assembly construction control of a cable-stayed bridge, and obtains the ideal control effect.It is shown that the initial exploration of the combination of virtual reality and construction control has achieved better control effect, which provides a certain theoretical reference value for the application of this technology to the practical bridge construction monitoring in the future.The practice proves that the concept of virtual reality combined with construction control technology based on digital image processing and virtual reality technology is reasonable and effective, and it can show the errors between the measured and theoretical results in each stage of construction control intuitively and realistically.At the same time, the error between the two can be solved in time, and the degree of information and automation is high, which provides an effective construction control method for the actual bridge construction control in the future.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U445.4

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