T型刚构转体设计与力学性能分析

发布时间：2018-01-12 22:39

本文关键词：T型刚构转体设计与力学性能分析　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国桥梁建设事业的飞速发展,转体桥梁的类型不断丰富多样,其转体的跨径和吨位不断刷新国内外桥梁建设的记录,大吨位桥梁不单要求采用精度好,强度高的转体球铰部件,对球铰上下的混凝土转盘也提出了更多、更高的要求,本文以万家沟大桥转体施工控制和稳定分析项目为工程背景,选用有限元软件ANSYS、MIDAS FEA对大吨位T构转体桥承台进行抗裂性能分析,其主要内容有:1、分析了转盘混凝土结构早期开裂的主要原因,是水泥水化热致使混凝土结构内部产生不均匀拉应力引起的,故本次对大体积混凝土承台转盘浇筑前后十天的养护环境进行模拟,对其进行温度应力分析,并进行了评价。2、以万家沟大桥为例,桥梁转体施工时,在最不利荷载工况下转盘混凝土在顺桥向Y轴、横向桥X轴、竖向Z轴方向各典型剖面的应力分布情况。3、参照规范的要求,对大体积承台转盘的温度抗裂措施提出了建议,并通过分析转体桥承台在配置了三向预应力后,在巨大的竖向荷载和牵引扭矩的作用下的传力模式和破坏方式,给出了转体承台在荷载作用下的抗裂建议,最终分析研究表明:大吨位T型刚构桥转体承台开裂的因素主要有温度应力引起的开裂,和不平衡弯矩作用下的开裂。
[Abstract]:With the rapid development of the bridge construction in our country, the types of the rotating bridge are rich and diverse, the span and tonnage of the rotary bridge constantly refresh the records of the bridge construction at home and abroad, and the large-tonnage bridge not only requires good precision. The high strength rotary ball hinge parts also put forward more and higher requirements for the concrete turntable up and down of the ball hinge. This paper takes the construction control and stability analysis project of Wanjiagou Bridge as the engineering background. The finite element software ANSYS Midas FEA is used to analyze the anti-crack performance of large-tonnage T-shaped bridge cap, the main content of which is: 1. The main reason of early cracking of concrete structure with rotary plate is caused by uneven tensile stress in concrete structure caused by hydration heat of cement. Therefore, this paper simulates the maintenance environment of mass concrete cap turntable 10 days before and after pouring, analyzes its temperature stress, and evaluates .2. taking Wanjiagou Bridge as an example, when the bridge is rotated. Under the most unfavorable load condition, the stress distribution of the typical sections of the turntable concrete in the direction of forward bridge Y axis, transverse bridge X axis, vertical Z axis. 3, referring to the requirements of the code. This paper puts forward some suggestions on the temperature crack resistance measures of the turntable of the large cap, and analyzes the force transfer mode and failure mode of the turntable cap under the action of huge vertical load and traction torque after the three-way prestressing is arranged. Finally, the analysis and study show that the main factors of the cracking of large tonnage T-type rigid frame bridge are the cracking caused by temperature stress. And cracking under the action of unbalanced moment.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.465

【参考文献】