大型短线拼装桥梁的施工监控及损伤预后研究

发布时间：2018-06-13 08:53

本文选题：短线预制 + 悬臂拼装　；参考：《北京建筑大学》2017年硕士论文

【摘要】：短线预制悬臂拼装技术是一种新型的桥梁施工技术,文章总结分析了短线预制悬臂拼装施工技术相关的理论与计算方法:“六点法控制理论”及其操作方法、短线预制悬臂拼装桥梁的线型计算方法、整体坐标与局部坐标之间的转换计算方法等,通过对这些理论、计算方法的研究、完善、创新,形成了一整套的、科学的短线预制悬臂拼装桥梁的施工技术。将这一套施工技术应用于某在建桥梁的施工监控工作,取得了理想的施工效果,以实际的工程案例验证了这套施工技术的可操作性,为今后采用此类工法的桥梁提供了参考。以某在建桥梁为工程背景,以一致多尺度有限元建模方法对某在建桥梁进行了损伤预后研究。材料和结构的损伤预后研究是一个跨越多个尺度的研究过程,一致多尺度有限元建模方法对于研究损伤过程有着独特的优越性。文章就一致多尺度有限元模型的建模方法做了深入研究,推导出了基于位移协调法和节点做功相等法的多点约束方程。应用推导出的多点约束方程作为不同种类单元之间的连接方式,进行算例分析,验证了多点约束方程的正确性与一致多尺度有限元建模方法的科学性。大型土木结构的损伤研究工作一直是国内外专家研究的热点,文章研究了混凝土材料的损伤塑性本构关系;基于ABAQUS有限元软件的混凝土塑性损伤模型,推导出了混凝土材料损伤因子的计算方法,并对ABAQUS有限元软件中的混凝土塑性损伤模型参数进行标定。依托某在建桥梁工程实例,对大桥进行了一致多尺度损伤仿真分析,计算出了某在建桥梁在基础不均匀沉降作用下的损伤发展过程;某在建桥梁在地震荷载作用下的损伤发展过程。文章提出的这种一致多尺度损伤仿真分析方法,可以为桥梁在复杂荷载作用下,如地震力、船只撞击等,进行损伤预后分析。
[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.
【学位授予单位】：北京建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

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