铁路下承式钢管混凝土拱桥受力特性分析

发布时间：2018-02-08 20:00

本文关键词： 钢管混凝土系杆拱内力计算拱脚应力施工控制　出处：《兰州交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着经济的快速发展，我国大力加强基础设施建设，各类钢管混凝土拱桥广泛的出现在国家基础交通建设中。它的迅速发展得益于我国经济突飞猛进的发展、社会劳动社产率的不断提高、冶金技术的发展和我国的实际国情，以及钢管混凝土结构自身具有的施工方便、自重轻、跨越能力强、造价低和耐久性好等一系列的优点。本文以某钢管混凝土系杆拱桥为工程实际背景。在研究过程中，运用大型有限元软件分别建立拱桥整体结构模型和拱脚局部实体模型，通过对其在不同施工阶段和荷载工况下的受力情况进行分析，得到实际拱桥结构受力状况的具体描述。首先，简述了钢管混凝土拱桥的发展历史，目前全球范围内对于拱桥整体、拱脚局部在不同荷载作用下的受力特性研究以及取得的成果，总结了在施工中钢管混凝土拱桥所依据的施工控制原理及方法；其次，运用Midas-Civil软件建立全桥平面杆系模型，分析了各个阶段拱桥整体的受力情况，同时利用全桥有限元模型所得应力和变形数据，对实际拱桥进行施工监控，监控成果基本达到设计预期的目标，满足控制目标要求。最后，通过ANSYS软件建立拱脚局部实体模型，分析拱脚在恒载作用下的受力情况，将所得拱脚附近系梁和拱肋应力情况与整体模型中相比较，在两种模型中，，拱脚受力情况大致相同，有较小误差，基本符合实际受力情况。在ANSYS建模过程中将拱肋截面按照截面换算原则进行换算，同时，对系梁的部分截面进行了适当的简化，其余部分尺寸严格按照设计要求给出。
[Abstract]:With the rapid development of economy, our country strengthens the construction of infrastructure, and all kinds of concrete-filled steel tubular arch bridges are widely used in the national basic traffic construction. Its rapid development benefits from the rapid development of our country's economy. With the increasing production rate of social labor agency, the development of metallurgical technology and the actual situation of our country, as well as the construction convenience, light weight, strong span ability, low cost and good durability of concrete-filled steel tube structure, etc. In this paper, a concrete-filled steel tubular tied arch bridge is taken as the engineering background. In the course of the research, the whole structure model of the arch bridge and the local solid model of the arch foot are established by using the large-scale finite element software, respectively. The concrete description of the actual arch bridge structure is obtained by analyzing the stress condition of the arch bridge under different construction stages and load conditions. Firstly, the development history of the concrete filled steel tube arch bridge is briefly described. At present, for the whole arch bridge in the whole world, the stress characteristics of arch foot under different loads and the results obtained are summarized. The construction control principle and method of concrete-filled steel tube arch bridge in construction are summarized. Secondly, The plane bar system model of the whole bridge is established by using Midas-Civil software, and the stress situation of the arch bridge in each stage is analyzed. At the same time, the stress and deformation data obtained from the finite element model of the whole bridge are used to monitor the construction of the actual arch bridge. The monitoring results basically reach the expected goal of the design and meet the requirements of the control goal. Finally, the local solid model of arch foot is established by ANSYS software, and the stress situation of arch foot under dead load is analyzed. The stress of the beam and rib near the arch foot is compared with that in the whole model. In the two models, the stress of the arch foot is approximately the same and the error is small. In the process of ANSYS modeling, the section of arch rib is converted according to the principle of section conversion. At the same time, the section of tie beam is simplified properly, and the other parts are given according to the design requirements.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.22

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