考虑腐蚀影响的覆土波纹钢桥涵受力性能试验研究

发布时间：2018-05-15 00:04

本文选题：覆土波纹钢板桥涵 + 腐蚀　；参考：《北京交通大学》2017年硕士论文

【摘要】：波纹钢板桥涵是近十几年来引入到我国道路桥涵工程领域的新的结构形式,由于其施工速度快、适用范围广、综合造价低、绿色环保等诸多优点,目前已经作为传统小跨径圬工桥涵的替代,发展非常迅猛。但对管拱形波纹钢板桥涵的受力性能方面的研究工作仍处于起步阶段,同时,在考虑腐蚀影响的波纹钢板桥涵受力性能方面的研究基本没有开展。因此,研究不同断面类型、考虑腐蚀影响具有重要的参考价值。本文以京新高速公路处于盐渍土地区的某跨径为4.2m的覆土波纹钢板管拱形桥涵为依托,通过现场监测试验以及有限元数值模拟的方法来研究其受力和变形性能。现场监测了管涵在连续施工过程中两个不同截面上对应测点的位移、应变及土压力。通过两个截面实测数据来分析管拱的受力性能,并结合施工过程分析了引起管涵发生对应变形形式的原因。随后,利用ANSYS建立了简化的二维平面应变有限元模型通过有限元模拟值与实测值进行对比,分析了施工过程中随填土高度增加管涵变形和土压力的变化规律,说明用被动土压力考虑土体压实影响的有限元模型更符合实际施工过程,与实测结果更为接近。接着,通过现场腐蚀试验和盐雾试验的方法,研究了波纹钢板桥涵的耐腐蚀性,对比分析了不同防腐措施的特点。最后,利用有限元软件ABAQUS建立了能够反映实际波形和腐蚀深度的三维实体有限元模型,通过三维有限元模型,进一步分析了不同腐蚀深度波纹钢板桥涵的应力和位移变化情况,以及轴向腐蚀和周向腐蚀对结构的应力和位移的影响。结果表明:利用热镀锌加沥青涂层的防腐措施防腐效果较好;随着腐蚀深度的增加,结构的位移和最大应力值均逐渐增大,且最大应力始终出现在腐蚀区域之内,同时,周向腐蚀比轴向腐蚀对结构的影响更明显。通过以上研究,为管拱形覆土波纹钢板管涵的防腐设计与施工提供了参考。
[Abstract]:Corrugated steel plate bridge and culvert is a new structural form introduced into the field of road bridge and culvert engineering in our country in recent ten years. Because of its many advantages such as fast construction speed, wide application scope, low comprehensive cost, green environmental protection, etc. At present, it has been used as a substitute for traditional small-span masonry bridges and culverts. However, the research on the mechanical behavior of pipe arch corrugated steel plate bridge and culvert is still in the initial stage, and the research on the mechanical behavior of corrugated steel plate bridge and culvert considering the influence of corrosion has not been carried out. Therefore, it has important reference value to study different section types and consider corrosion effect. Based on the arch bridge and culvert of corrugated steel pipe with a span of 4.2 m in the saline soil area of Jingxin Expressway, the stress and deformation properties of the bridge and culvert are studied by field monitoring test and finite element numerical simulation. The displacement, strain and earth pressure of two different sections of pipe culvert in continuous construction are monitored. Based on the measured data of two sections, the mechanical behavior of the pipe arch is analyzed, and the causes of the corresponding deformation of the pipe culvert are analyzed in combination with the construction process. Then, the simplified two-dimensional plane strain finite element model is established by using ANSYS, and the variation law of pipe deformation and earth pressure with the increase of filling height is analyzed by comparing the finite element simulation value with the measured value. It is shown that the finite element model with passive earth pressure considering the influence of soil compaction is more in line with the actual construction process and is closer to the measured results. Then, the corrosion resistance of corrugated steel plate bridge and culvert is studied by means of field corrosion test and salt spray test, and the characteristics of different anticorrosion measures are compared and analyzed. Finally, the three-dimensional solid finite element model which can reflect the actual waveform and corrosion depth is established by using the finite element software ABAQUS. Through the three-dimensional finite element model, the stress and displacement changes of corrugated steel plate bridge and culvert with different corrosion depth are further analyzed. And the influence of axial corrosion and circumferential corrosion on the stress and displacement of the structure. The results show that the anticorrosive effect of hot-dip galvanizing and asphalt coating is good, and with the increase of corrosion depth, the displacement and maximum stress of the structure increase gradually, and the maximum stress always appears in the corrosion zone, and at the same time, The effect of circumferential corrosion is more obvious than that of axial corrosion. The above research provides a reference for the anticorrosion design and construction of pipe arch-shaped corrugated steel pipe culvert.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U446

【参考文献】