横隔板厚度对正交和斜交多片T梁桥静动力性能影响分析研究

发布时间：2018-03-23 03:10

本文选题：多片梁桥　切入点：横隔板　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：首先,论文简要概述了近年来多片梁桥在运营使用中出现的典型事故,介绍了该类桥梁形式的典型病害。之后,论文以30m跨度简支多片T梁正交桥与斜交桥两种结构为研究对象,计算分析不同横隔板厚度对结构受力的影响。采用大型通用有限元软件ANSYS建立全桥组合单元模型,对桥梁进行静力计算分析,针对中梁跨中加载、中梁1/4跨加载、边梁1/4跨偏心加载、考虑支座部分失效时1/4跨偏心加载和边梁跨中偏心加载五种工况,计算不同横隔板厚度时梁端纵向位移、跨中梁底纵向应力和梁顶湿接缝处横向应力,分析横隔板厚度对桥梁静力性能的影响。最后,应用桥梁计算软件MIDAS/CIVIL利用梁格法建立全桥空间梁单元模型,考虑桩-土效应,模拟桥梁的下部结构和地基的影响,计算分析桥梁自振特性,采用反应谱法和时程法分别对其动力性能进行计算分析。论文计算分析表明,适当增加横隔板厚度能够减小该类桥梁梁底出现纵向拉应力与开裂的风险、梁顶湿接缝处横向应力和梁端纵向变形差,改善桥梁整体受力性能。
[Abstract]:First of all, the paper briefly summarizes the typical accidents in the operation and use of multi-beam bridges in recent years, and introduces the typical diseases of this kind of bridges. In this paper, two kinds of structures with 30 m span simply supported T-beam orthogonal bridge and skew bridge are taken as the research objects, and the influence of different thickness of transverse diaphragm on the stress of the structure is calculated and analyzed. The full-bridge composite element model is established by using the large-scale universal finite element software ANSYS. According to the static calculation and analysis of the bridge, for the middle beam, the middle beam 1 / 4 span load, the edge beam 1 / 4 span eccentricity load, considering the partial failure of the support, the 1 / 4 span eccentric load and the edge beam middle eccentric load are considered. The longitudinal displacement at the end of the beam, the longitudinal stress at the bottom of the beam and the transverse stress at the wet joint at the top of the beam are calculated when the thickness of the diaphragm is different. Finally, the influence of the thickness of the diaphragm on the static behavior of the bridge is analyzed. The bridge calculation software MIDAS/CIVIL is used to establish the spatial beam element model of the whole bridge. Considering the pile-soil effect, the bridge substructure and the influence of the foundation are simulated, and the natural vibration characteristics of the bridge are calculated and analyzed. The dynamic performance of the bridge is calculated and analyzed by using the response spectrum method and the time-process method. The calculation and analysis show that the risk of longitudinal tensile stress and cracking at the bottom of this kind of bridge can be reduced by increasing the thickness of the transverse diaphragm appropriately. The transverse stress at the top wet joint of the beam and the longitudinal deformation at the end of the beam improve the overall mechanical performance of the bridge.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441

【相似文献】