大跨度斜拉桥方案选型研究

发布时间：2018-05-02 01:34

本文选题：跨度 + 斜拉桥　；参考：《北京交通大学》2017年硕士论文

【摘要】：斜拉桥是大跨度桥梁常用桥型,工程师通过技术讨论和革新使斜拉桥形状和形式相结合,对于跨度1000m左右的桥梁,斜拉桥是最经济的。由于这些特殊性,本文决定选择斜拉桥来进行研究,通过调整塔高、索与索之间的间距、梁高来评价斜拉桥的经济性。同时,梁体与塔底的弯曲弯矩也被考虑来评价斜拉桥的安全性。通过改变悬索桥上述的三个特性值,一共建立24组桥梁模型用于分析和讨论。运用MIDAS CIVIL来建立桥梁有限元模型并考虑恒载、车辆荷载、风荷载进行内力分析,以验证梁体截面与塔底截面是否满足设计要求。梁体截面需施加预应力钢筋,塔底截面需要运用Ucfyber计算塔底截面的最大承载弯矩并与实际塔底截面最大弯曲弯矩对比。结果显示,只有15组桥梁满足梁体截面强度,只有14组桥梁满足塔底强度需求。本文通过分析基础图表资料,结合经济成本条件选择最有价值的桥梁。对于大跨度斜拉桥的经济讨论主要是关于塔与梁的高度,因为塔与梁的建设需要大量混凝土。最后,我们选择所有斜拉桥需塔高最低、索与索之间间距最大、梁高度最小,且能满足截面强度需求。
[Abstract]:Cable-stayed bridge is commonly used in long-span bridges. Engineers combine the shape and form of cable-stayed bridges through technical discussion and innovation. For bridges with a span of about 1000m, cable-stayed bridges are the most economical. Because of these particularities, this paper chooses the cable-stayed bridge to study. By adjusting the tower height, the distance between the cable and the cable, the girder height is used to evaluate the economy of the cable-stayed bridge. At the same time, the bending moment of beam and tower bottom is considered to evaluate the safety of cable-stayed bridge. By changing the above three characteristic values of suspension bridge, a total of 24 groups of bridge models are established for analysis and discussion. The finite element model of bridge is established by using MIDAS CIVIL and the internal force analysis is carried out considering dead load, vehicle load and wind load to verify whether the section of beam body and the section of tower bottom meet the design requirements. The prestressed steel bar is applied to the beam section and the Ucfyber is used to calculate the maximum bearing moment of the tower bottom section and the maximum bending moment of the tower bottom section is compared with that of the actual tower bottom section. The results show that only 15 groups of bridges meet the beam section strength and only 14 groups of bridges meet the needs of tower bottom strength. In this paper, the most valuable bridge is chosen by analyzing the basic chart data and combining the economic cost conditions. The economic discussion of long span cable-stayed bridge is mainly about the height of tower and beam, because the construction of tower and beam needs a lot of concrete. Finally, we select all cable-stayed bridges with the lowest tower height, the largest distance between cable and cable, and the minimum beam height, which can meet the demand of cross-section strength.
【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】：U448.27

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