【作者】 陈松；

【导师】 周志祥；

【作者基本信息】 重庆交通大学 ， 桥梁与隧道工程， 2013， 硕士

【摘要】 本文依托导师承担的交通运输行业联合科技攻关项目(2010-353-341-230),以河南桃花峪黄河大桥模型试验为背景,对试验模型中主缆线形的变化特征及抗弯刚度的影响开展了探索研究,主要工作及结论如下：(1)依据相似理论原理,利用数值分析的方法,以主缆分段集中配重代替均匀配重,分析对比了两种配重形式下的主缆线形、轴力差异,证明了利用分段集中配重代替均匀配重的合理性；根据无应力状态控制法的思想,提出了以理论吊点作为参照点确定索夹位置的方法,可减少施工环节的测量工作,提高工作效率,并且不易受施工环境变化的影响。(2)探讨了主塔高度误差、跨度误差、温度变化对空缆线形的影响,以传统抛物线形计算理论为基础,分析推导了各误差因素对空缆线形影响的关系式；根据计入误差因素的有限元模型,分析了空缆线形对各因素的敏感性；依据线形变化与影响因素之间的关系式,提出了试验模型空缆调整的措施。(3)针对主缆抗弯刚度对主缆线形的影响,以“梁单元”模拟索单元主缆,分析了二者引起的线形差异,得出了“梁单元”抗弯刚度取值方法；根据理论计算分析了索夹位置弯曲应力随体系转换过程的变化规律。更多还原

【Abstract】 Basing on the test model of Taohuayu Yellow River Bridge, the effects of main cable’s linear characters and bending stiffness in this model are explored relying on the key scientific project of transportation industry (2010-353-341-230) leaded by my tutor. The main work and conclusions are summarized as the followings:(1) Analysis and comparisons of the cable curve and shear forces using piecewise-concentrated counterweight and uniform counterweight are respectively made basing on the principle of similarity theory and numerical analysis methods, and the results prove the reasonability to use piecewise-concentrated counterweight instead of uniform counterweight. According to the ideology of unstressed control theory, a method of taking theoretic lifting point as reference point to determine the clamp position is advanced, which reduces the measuring work in construction, improves the work efficiency and is less susceptible to the change of construction environment.(2) The influences of main tower’s error (height error and span error) and temperature change on the free cable curve are explored, and respective relationships between the error factors and the cable curve are analyzed and derived basing on traditional parabolic theory. The sensitivity of the free cable curve to each error factor is correspondingly studied through FEM including in error factors. And then adjusting measures aiming at test model are further proposed according to the relationship obtained.(3) Aiming at the effects of bending stiffness of main cable on the cable curve, main cable is simulated by beam element but not traditional cable element, and the bending stiffness method for beam element is obtained by the analysis of the linear differences using two different element type. The bending stress variation with the system transition in where the cable clamp locates is analyzed according to theoretical calculation.更多还原