文档介绍：南京航空航天大学
硕士学位论文
涵洞钢波纹管力学特性的试验研究
姓名:钱海涛
申请学位级别:硕士
专业:道路与铁道工程
指导教师:夏逸鸣
2011-03
南京航空航天大学硕士学位论文
摘要
目前国内公路桥涵绝大部分仍采用钢筋混凝土或圬工材料,修建在软土等地基基础上的管
涵在路基自身压缩变形和地基沉降变形过程中非常容易导致涵管的破坏。如果采用柔性的、高
强度的钢质圆形波纹管涵则可大大改善其对地基及基础变形的适应能力,解决因地基基础不均
匀沉降导致的涵洞破坏问题。
通过光纤布拉格光栅传感器来测试钢波纹管涵洞的受力特性在国内还是首次应用,光纤传
感技术可以克服传统测试技术易受环境影响、易受电磁干扰等缺点,经过温度修正,可以达到
较高的测试精度,适合工程结构的形变及可靠性的长期监测。目前,国内对于钢波纹管涵洞在
地下水位较高的软土地区的工程适应性研究较少,本文通过南京长江第四大桥北延线的两处钢
波纹管涵洞的实际工程试验研究,对不同填土高度和车辆荷载下,钢波纹管涵洞的受力特性进
行了试验测试和数值计算分析,总结其变化规律,提炼工程设计要素,从而完善钢波纹管涵结
构设计。
试验测试与有限元分析的结果表明,采取纵轴向波纹化处理后的钢质圆管具有非常大的管
轴向变形补偿能力,能够非常好的提供适应地基变形的材料伸展余地,从而可充分发挥其在大
的地基基础变形情况下的良好径向与轴向受力特性,更大程度的分散荷载效应,更好地发挥钢
结构的优势。因此,在软土、膨胀土、湿陷性黄土、多年冻土等不良工程地质情况下,利用钢
波纹管结构修筑涵洞具有非常明显的优势。
关键词:钢波纹管,涵洞,力学性能,道路工程,布拉格光纤光栅,有限元分析,试验
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涵洞钢波纹管力学特性的试验研究
ABSTRACT
At present, most of small bridges and culverts in the road still use reinforced concrete or masonry
materials. In the process of pressive strain and foundation settlement deformation, the
pipe culvert built on soft soil foundation is very easy to lead to the destruction. If the corrugated steel
pipe culvert with great flexibility and high strength could be put into use, it can greatly improve the
adaptive ability of the foundation and basis deformation to slove the uneven settlement of foundation
problems, which will cause the damage to the culvert.
It is the first application in China to test the mechanical properties of corrugated steel pipe culvert by
fiber Bragg grating sensor. Compared with traditional testing techniques, optical fiber sensing
technology can easily e the ings, such as vulnerable of the environmental impact
and ic interference. After temperature correction, it can reach high precision which is
suitbale to long-term monitoring for the the deformation and reliability of engineering structures.
Currently, the adaptive engineering research of corrugated steel culver is less in the soft soil with high
ground water level. I