【作者】 陈东；

【导师】 祝兵； 付勇；

【作者基本信息】 西南交通大学 ， 建筑与土木工程（专业学位）， 2016， 硕士

【摘要】 波形钢腹板组合箱梁是桥梁结构发展的主要方向之一,它能够分别充分利用混凝土和钢材的力学性能。零号块、转向块、锚固块是刚构—连续组合梁桥的相对关键部位,故对这些部位进行详细的应力计算分析,从而为设计出合理的、安全的零号块、转向块和锚固块提出合理建议已成为一个重要的工程问题。以兰州北环小砂沟大桥为工程背景,对大跨度波形钢腹板箱梁桥的主要特性进行了理论研究。首先介绍有限元基本原理以及建模方法,之后利用有限元软件ANSYS建立零号块、转向块、锚固块有限元模型,对其进行施工阶段短暂工况以及运营阶段持久工况应力分析。Zuihou给出分析结论及建议,对施工设计提供一定的参考。计算结果表明：零号块的主要受拉区域为横隔板,且横隔板处于三向拉应力状态,零号块的顶板、腹板、底板主要表现为受压,其中较大压应力分布在顶板和腹板上半部分,顶板处于三向压应力状态,结构受力性能较好；对于转向块,除了转向孔洞削弱以及转向块四个角点因此产生应力集中以外,其余结构均满足规范要求；除应力集中以外,转向块较大应力主要分布在上下缘,所以应做好局部加强；锚固块除锚固槽口棱角附近和体外预应力孔道边缘产生应力集中,其余地方均满足规范要求。锚固块较大拉应力主要分布在箱梁突变截面的预应力孔道周围,较大的压应力主要分布在锚垫板下面以及槽口底面锚垫板周围,该部位在设计时应特别注意局部加强。更多还原

【Abstract】 The composite box girder with corrugated steel webs is one of the main directions of the development of the bridge structure, which can make full use of the mechanical properties of concrete and steel. 0th, steering, anchor blocks are the relative key parts of the rigid-Continuous Beam Bridge key parts. Therefore, it has become an important engineering problem to design a reasonable and safe zero block, steering block and anchor block by the analysis of the stress calculation of these parts.In this paper, the main mechanical properties of large-span corrugated steel webs box girder bridge are studied with the Xiaoshagou bridge of Lanzhou north ring road as background. Firstly, the basic principle of finite element and the modeling method are introduced, and then the finite element model of the zero block, the steering block and the anchor block are established by using the finite element software ANSYS. The finite element carried on Stress analysis at Transient condition and Persistent condition. Finally, the paper gives the analysis conclusion and the suggestionand provides the certain reference to the construction design.As shown by calculation, The main Tensile zone of the zero block is the transverse diaphragms, and It is in the three direction tension stress state, The top plate, web plate and bottom plate of the zero block are mainly compressed, and the larger compressive stress is distributed in the top plate and web plate. The top plate is in the three direction compressive stress state, and the stress performance of the structure is better. In addition to the corners, the steering block is weakened and the stress concentration is produced at the four corners, and the rest structure meets the requirements of the specification. In addition to the stress concentration, the larger stress of the steering block is mainly distributed in the upper and lower edges, so it should be strengthened. The anchor block in addition to stress concentration at Near anchorage notch edges and external prestressing duct, and the rest structure meets the requirements of the specification. Anchor block large tensile stress is mainly distributed in the box girder mutation section of prestressed ducts around, larger pressure stress is mainly distributed in the anchor backing plate below as well as the notch bottom surface of the anchor plate around, and the parts in the design should be special attention to strengthen the local.更多还原