斜交低填大孔径钢波纹管涵内壁应变规律研究

发布时间：2018-01-17 20:08

本文关键词：斜交低填大孔径钢波纹管涵内壁应变规律研究　出处：《西安工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：钢波纹管涵洞作为一种新型涵洞结构目前在我国公路工程中已经得到逐渐推广应用,尤其在地质条件较差的地区应用广泛,其性能优势更加突出。钢波纹管涵内壁应变的大小和应变分布规律直接决定着涵洞在使用过程中的安全可靠性,因此对钢波纹管涵洞内壁管周应变分布规律和随车辆荷载作用的变化规律的研究有着十分重要的意义,可为钢波纹管涵洞的结构优化和规范施工提供一定的技术支持。目前国内外关于斜交、低填、大孔径三个受力不利因素组合情况下的钢波纹管涵内壁应变规律的研究尚未见报导。本文依托实际工程开展现场试验研究,并结合现场实测结果,建立有限元足尺数值模型,系统地分析了斜交角度、管顶填土高度及孔径对钢波纹管涵内壁应变的影响,最后总结出了相关的规律。现场试验结果表明:在路基分层回填施工过程中,斜交低填大孔径钢波纹管涵内壁管周切向应变随填土高度的增加而增加,但应变增量随填土高度的增加稍有趋缓;斜交低填大孔径钢波纹管涵内壁在管周30°、60°和180°处的切向应变随填土高度的增加及车辆荷载作用位置的变化而引起的增量相对较大。有限元数值模拟结果表明:斜交低填大孔径钢波纹管涵内壁波峰切向压应变表现出由管顶和管底向管侧逐层增加的规律;波谷切向压应变表现出由管顶向管底逐层增加的规律;当其它条件不变的情况下,除波峰0°和180°处外,钢波纹管涵内壁压应变随着斜交角度的增大表现出微小增加的规律、随管顶填十高度的增加表现出较大增加的规律、随孔径的增大表现出较大增加的规律。
[Abstract]:As a new type of culvert structure, steel corrugated pipe culvert has been gradually popularized and applied in highway engineering in China, especially in areas with poor geological conditions. The inner wall strain and strain distribution law of steel bellows pipe culvert directly determine the safety and reliability of culvert in the process of use. Therefore, it is of great significance to study the distribution of strain around the inner wall of steel corrugated pipe culvert and the law of variation with vehicle load. It can provide certain technical support for structural optimization and standard construction of steel corrugated pipe culvert. The research on the strain law of the inner wall of steel bellows culvert under the condition of the combination of three unfavorable forces with large aperture has not been reported yet. The field test research is carried out based on the actual engineering in this paper and combined with the field measurement results. The finite element full-scale numerical model is established, and the effects of oblique angle, pipe top filling height and aperture on the internal strain of steel corrugated pipe culvert are systematically analyzed. The field test results show that in the process of subgrade stratified backfilling, the circumferential tangential strain of steel corrugated pipe culvert with inclined low filling and large aperture increases with the increase of filling height. However, the strain increment slowed slightly with the increase of the fill height. The inner wall of steel corrugated pipe culvert with large aperture is 30 掳on the circumference of the pipe. The increment of tangential strain at 60 掳and 180 掳is relatively large with the increase of filling height and the change of vehicle load position. The results of finite element numerical simulation show that:. The tangential compressive strain of the inner wall of the steel corrugated pipe culvert with inclined cross and low filling large aperture shows the law of increasing layer by layer from the top of the pipe and the bottom of the pipe to the side of the pipe. The shear compression strain of the trough shows the law of increasing from the top of the pipe to the bottom of the pipe layer by layer. When other conditions are not changed, the compressive strain of the inner wall of the corrugated steel pipe culvert increases slightly with the increase of the oblique angle, except at the peak of 0 掳and 180 掳. With the increase of the top filling height of the pipe, it shows a large increase law, and a large increase law with the increase of the pore diameter.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U449.83

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