矮塔斜拉桥0#块空间应力测试与分析

发布时间：2018-06-26 02:13

本文选题：矮塔斜拉桥 + 0#块　；参考：《东北林业大学》2014年硕士论文

【摘要】：矮塔斜拉桥以其优良的结构性能以及良好的经济指标,得到越来越广泛的应用。箱梁0#块位于矮塔斜拉桥塔、墩、梁连接处,几何形式和边界条件都十分复杂,作为悬臂施工的起点,施工过程中承担两侧悬臂重量,通常布置大量的普通钢筋与预应力筋,并且随着施工的进展应力不断发生变化,处于复杂的三向受力状态,普通的平面杆系计算已不能满足精度要求,因此建立0#块三维空间有限元模型,细致分析0#块空间应力状态是十分必要的。本文以浙江省常山大桥(65+108+65m双塔单索面矮塔斜拉桥)为工程背景,首先运用MIDAS/civil有限元软件,建立常山大桥平面杆系模型,进行全桥静力分析,重点计算最大悬臂阶段及成桥阶段两种工况下结构内力、位移、应力、索力,同时为后续0#块实体模型的加载与分析提供数据准备；其次运用MIDAS/FEA有限元软件,建立常山大桥0#块空间有限元模型,基于箱梁空间应力分析理论,分别对最大悬臂阶段及成桥阶段0#块三向正应力及主应力进行分析,细致掌握0#块顶板、底板、腹板、横隔板各区域的应力数值及分布规律；最后根据施工现场实际情况及理论计算结果,选取0#块应力测试截面及测点,埋置传感器跟踪监测各主要施工阶段0#块应力数值,总结悬臂施工过程中0#块应力变化规律,并及时与理论计算值作对比校核,分析误差产生原因,保证施工安全顺利进行。本文研究得出的结论可对依托工程提供数据支持,同时可为矮塔斜拉桥0#块优化设计、空间应力计算分析及应力监测提供参考,具有重要的现实意义。
[Abstract]:The short tower cable-stayed bridge is more and more widely used because of its excellent structural performance and good economic index. The box girder 0# block is located in the short tower cable-stayed bridge tower, pier and beam connection, the geometric form and boundary condition are very complex. As the starting point of the cantilever construction, the weight of the cantilever on both sides of the cantilever construction is carried out in the construction process, and a large number of ordinary steel bars are usually arranged. With the prestressed reinforcement, and with the progress of the construction stress constantly changing, in the complex three direction force state, the ordinary plane bar system calculation can not meet the precision requirements. Therefore, it is necessary to establish the three-dimensional finite element model of 0# block and analyze the stress state of the 0# block in detail.
This paper takes the Changshan bridge in Zhejiang (65+108+65m Twin Towers single cable plane short tower cable-stayed bridge) as the engineering background. First, the MIDAS/civil finite element software is used to establish the plane bar model of Changshan bridge, and the static analysis of the whole bridge is carried out. The structural internal force, displacement, stress and cable force are calculated in the two working conditions of the maximum cantilever stage and the bridge stage. At the same time, it is the follow-up 0. The data preparation is provided for the loading and analysis of the block entity model. Secondly, the finite element model of the Changshan bridge 0# block is established by using the MIDAS/FEA finite element software. Based on the box beam spatial stress analysis theory, the three direction stress and the main stress of the maximum cantilever stage and the bridge stage 0# block are analyzed, and the roof, floor and web of the 0# block are carefully mastered. At last, according to the actual situation of the construction site and the theoretical calculation results, the stress test section and measuring point of the 0# block are selected according to the actual situation of the construction site and the theoretical calculation results. The stress value of the 0# block in the main construction stages is tracked by the buried sensor, and the stress variation law of the 0# block in the cantilever construction process is summarized, and the calculation value is in time with the theoretical calculation value. Compared with checking, the causes of errors are analyzed and the construction safety is ensured smoothly.
The conclusions obtained in this paper can provide data support for the support project, and can provide reference for the optimization design of the 0# block of the short tower cable-stayed bridge, the calculation and analysis of the spatial stress and the stress monitoring, which is of great practical significance.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27;U441.5

【参考文献】