不对称连续刚构桥受力性能研究

发布时间：2018-03-09 08:12

  本文选题：不对称连续刚构桥　切入点：跨径不对称　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国交通事业的不断发展,公路里程也在不断刷新,桥梁作为公路工程中不可缺少的一部分,也得到不断的发展。在我国西南地区,由于地理环境以峡谷山区居多,桥梁更是越来越多的建设,也正是由于其地理环境的限制,建造对称连续刚构桥,可能需要破坏当地环境或者需要大量的开挖深山,因此不对称的连续刚构桥渐渐应用到实际工程中。本文以一对称的连续刚构桥为背景,建立长度不同的用悬臂施工现浇形成的两T构,得到不同的不对称连续刚构桥的模型。通过有限元软件MIDAS/Civil进行成桥后的模拟和分析,得到了关于不对称三跨连续刚构桥以下有益结论：①悬臂施工形成的两T构在长度不一样的情况下,认为其长度的比值范围在0.39η≤1是比较合理。②两T构采用不同的梁高曲线和底板厚度曲线时,在大T构采用2.0次抛物线时,小T构采用1.5次抛物线变化,其受力与都采用2.0次抛物线变化时,相差不大,最主要的在于梁端支座反力的改善。③在对不对称连续刚构桥的主墩分析时,主要研究了其不对称连续刚构桥的主梁与高、低墩之间的搭配问题,分析发现大T构段产生的纵向位移要大,因此大T构段墩的高度应比小T构段墩的高度要高。④采对不同墩截面形式、双墩之间间距时,发现薄壁双肢墩可以有效降低墩顶弯矩,而且应力水平要比单柱墩要小,双肢间距对结构受力的影响不大。
[Abstract]:With the continuous development of transportation in our country, highway mileage is also being refreshed, and bridges, as an indispensable part of highway engineering, have also been continuously developed. In southwest China, because of the geographical environment, most of them are gorge mountains. More and more bridges are being built. It is precisely because of the limitations of their geographical environment that the construction of symmetrical continuous rigid frame bridges may need to destroy the local environment or require a large number of deep mountains to be excavated. Therefore, asymmetric continuous rigid frame bridges are gradually applied to practical projects. In this paper, a symmetrical continuous rigid frame bridge is used as a background to establish two T structures with different lengths of cantilever cast-in-situ. Different models of asymmetric continuous rigid frame bridge are obtained. The simulation and analysis of the bridge are carried out by the finite element software MIDAS/Civil. It is obtained that the two T structures formed by the cantilever construction of 1: 1 are different in length when the unsymmetrical three-span continuous rigid frame bridge is constructed under the following beneficial conclusion. It is considered that the ratio range of 0.39 畏 鈮，

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