悬索桥不等高索塔对于主缆性态的影响分析

发布时间：2018-05-25 19:14

本文选题：悬索桥 + 主缆性态　；参考：《长安大学》2015年硕士论文

【摘要】：对于悬索桥的主缆受力及其线形分析,是一座悬索桥精确计算的重中之重,其各方面的影响参数复杂而繁多,值得深入探究,以更精确的参数分析来服务于工程实用。当前我国公路建设不断地向高山沟谷地区发展,悬索桥桥型有着广阔的前景,同时复杂的地形选线决定了不等高索塔这一特殊形式的悬索桥具有很现实的研究价值。因此,本文结合工程实例,着重研究两侧主塔不等高这一悬索桥较为特殊的受力形式,针对该影响因素分析其对于悬索桥的主缆性态的具体作用。该依托工程为一典型的索塔不等高地锚式大跨径悬索桥,两侧索塔高差为10.362m。本文首先分析和探究了主缆的精确解析计算过程,确立了本文对于主缆性态的计算方法与其关键参数,并分析了悬索桥索塔的受力特点及其对于主缆计算所存在的影响作用。接着本文利用有限元软件来建立计算模型,并结合解析计算公式进行辅助计算及细部修正。对悬索桥索塔不等高这一特殊因素选取适当参数方案,分别进行分析计算及对比。在关键计算数据分析上,选择有:主缆各个关键位置的张力、各支点的竖向压力、主缆总体线形、索鞍处切线角、主缆无应力长度及伸长量。对于这些关键点,通过对数值计算结果进行曲线拟合、数据分析来研究其受不等高索塔的影响作用及其程度和变化特点。最后对于结果汇总和分析得到,不等高索塔这一形式对于悬索桥的受力和线形有较为明显的不良影响,导致了主缆张力及支点竖向压力的增大,全桥受力的不对称重分布,总体线形的偏移,对较高塔一侧明显的受力不利趋势。主要影响集中于中跨而对于边跨及锚跨则较为有限。本文通过研究分析悬索桥的索塔不等高这一受力形式下的主缆性态,并得出相应结论,对于在不等高索塔这一特殊形式影响下的悬索桥内力和线形的计算分析提供了一些参考。
[Abstract]:The stress on the main cable of suspension bridge and its linear analysis are the most important in the accurate calculation of the suspension bridge. The influence parameters of the suspension bridge are complex and various, which is worth further exploring and serving the engineering practice with more accurate parameter analysis. At present, the highway construction in our country is developing to the high mountain and valley area. The bridge type of suspension bridge has a broad prospect. At the same time, the complex terrain route selection determines the special form suspension bridge of different height tower has very realistic research value. Therefore, combining with the engineering examples, this paper focuses on the study of the different heights of the main towers on both sides of the suspension bridge, which is the special force form of the suspension bridge, and analyzes the concrete effect of the influence factor on the main cable behavior of the suspension bridge. The supporting project is a typical long-span suspension bridge with different heights and different heights, and the height difference between the two sides is 10.362m. This paper first analyzes and probes into the accurate analytical calculation process of the main cable, establishes the calculation method and key parameters of the main cable behavior in this paper, and analyzes the stress characteristics of the cable tower of the suspension bridge and its influence on the calculation of the main cable. Then the finite element software is used to establish the calculation model, and combined with the analytical calculation formula to carry on the auxiliary calculation and the detail correction. The proper parameter scheme is selected for the special factor of the suspension bridge tower's unequal height, and the analysis and comparison are carried out respectively. In the analysis of the key calculation data, the following are selected: the tension of each key position of the main cable, the vertical pressure of each fulcrum, the overall alignment of the main cable, the tangent angle at the saddle of the cable, the length and elongation of the main cable without stress. For these key points, through the curve fitting of the numerical calculation results and the data analysis, the influence of the different height tower on the effect, the degree and the change characteristics of the tower are studied. Finally, according to the summary and analysis of the results, it is found that the form of unequal height cable tower has obvious adverse effects on the force and alignment of the suspension bridge, which leads to the increase of the tension of the main cable and the vertical pressure of the fulcrum, and the asymmetric redistribution of the force on the whole bridge. The deviation of the overall line is unfavorable to the force on one side of the tower. The main influence is on middle span, but limited on side span and anchor span. Through the study and analysis of the main cable behavior of the suspension bridge under the force form of unequal height of the cable tower, the corresponding conclusions are drawn, which provide some references for the calculation and analysis of the internal force and the line shape of the suspension bridge under the influence of the special form of the cable tower of the different height.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.25

【相似文献】