本文選題：短線預(yù)制 + 懸臂拼裝　； 參考：《北京建筑大學(xué)》2017年碩士論文

【摘要】：短線預(yù)制懸臂拼裝技術(shù)是一種新型的橋梁施工技術(shù),文章總結(jié)分析了短線預(yù)制懸臂拼裝施工技術(shù)相關(guān)的理論與計(jì)算方法:“六點(diǎn)法控制理論”及其操作方法、短線預(yù)制懸臂拼裝橋梁的線型計(jì)算方法、整體坐標(biāo)與局部坐標(biāo)之間的轉(zhuǎn)換計(jì)算方法等,通過對(duì)這些理論、計(jì)算方法的研究、完善、創(chuàng)新,形成了一整套的、科學(xué)的短線預(yù)制懸臂拼裝橋梁的施工技術(shù)。將這一套施工技術(shù)應(yīng)用于某在建橋梁的施工監(jiān)控工作,取得了理想的施工效果,以實(shí)際的工程案例驗(yàn)證了這套施工技術(shù)的可操作性,為今后采用此類工法的橋梁提供了參考。以某在建橋梁為工程背景,以一致多尺度有限元建模方法對(duì)某在建橋梁進(jìn)行了損傷預(yù)后研究。材料和結(jié)構(gòu)的損傷預(yù)后研究是一個(gè)跨越多個(gè)尺度的研究過程,一致多尺度有限元建模方法對(duì)于研究損傷過程有著獨(dú)特的優(yōu)越性。文章就一致多尺度有限元模型的建模方法做了深入研究,推導(dǎo)出了基于位移協(xié)調(diào)法和節(jié)點(diǎn)做功相等法的多點(diǎn)約束方程。應(yīng)用推導(dǎo)出的多點(diǎn)約束方程作為不同種類單元之間的連接方式,進(jìn)行算例分析,驗(yàn)證了多點(diǎn)約束方程的正確性與一致多尺度有限元建模方法的科學(xué)性。大型土木結(jié)構(gòu)的損傷研究工作一直是國內(nèi)外專家研究的熱點(diǎn),文章研究了混凝土材料的損傷塑性本構(gòu)關(guān)系;基于ABAQUS有限元軟件的混凝土塑性損傷模型,推導(dǎo)出了混凝土材料損傷因子的計(jì)算方法,并對(duì)ABAQUS有限元軟件中的混凝土塑性損傷模型參數(shù)進(jìn)行標(biāo)定。依托某在建橋梁工程實(shí)例,對(duì)大橋進(jìn)行了一致多尺度損傷仿真分析,計(jì)算出了某在建橋梁在基礎(chǔ)不均勻沉降作用下的損傷發(fā)展過程;某在建橋梁在地震荷載作用下的損傷發(fā)展過程。文章提出的這種一致多尺度損傷仿真分析方法,可以為橋梁在復(fù)雜荷載作用下,如地震力、船只撞擊等,進(jìn)行損傷預(yù)后分析。
[Abstract]:The short-wire prefabricated cantilever assembly technology is a new bridge construction technology. This paper summarizes and analyzes the theory and calculation method related to the short-wire prefabricated cantilever assembly construction technology: "six point method control theory" and its operation method. Through the research of these theories, calculation methods, consummation and innovation, a whole set of methods has been formed, such as the calculation method of the short line prefabricated cantilever assembly bridge, the conversion calculation method between the integral coordinate and the local coordinate, etc. Scientific construction technology of short-line prefabricated cantilever assembly bridge. This set of construction technology has been applied to the construction monitoring work of a certain bridge under construction, and the ideal construction effect has been obtained. The operability of this set of construction technology has been verified by actual engineering cases, which provides a reference for the future use of this kind of construction method. Taking a bridge under construction as the engineering background, the damage prognosis of a bridge under construction is studied by using the uniform multi-scale finite element modeling method. The study of damage prognosis of materials and structures is a multi-scale research process, and the uniform multi-scale finite element modeling method has a unique advantage in studying the damage process. In this paper, the modeling method of uniform multi-scale finite element model is deeply studied, and the multi-point constraint equation based on displacement coordination method and joint work equality method is derived. By using the derived multi-point constraint equation as the connection between different kinds of elements, the correctness of the multi-point constraint equation and the scientific nature of the uniform multi-scale finite element modeling method are verified. The damage research work of large civil structures has been a hot topic of experts at home and abroad. The damage plastic constitutive relation of concrete materials is studied in this paper, and the concrete plastic damage model based on Abaqus finite element software is also studied in this paper. The method of calculating the damage factor of concrete material is derived, and the parameters of plastic damage model of concrete in Abaqus finite element software are calibrated. Based on an example of a bridge under construction, a uniform multi-scale damage simulation analysis of the bridge is carried out, and the damage development process of a bridge under the action of uneven settlement of the foundation is calculated. Damage development process of a bridge under earthquake load. The uniform multi-scale damage simulation method proposed in this paper can be used to analyze the damage prognosis of bridges under complex loads such as earthquake force and ship impact.
【學(xué)位授予單位】：北京建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U445.4

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