大跨径曲线连续刚构桥收缩徐变和预应力损失研究
发布时间：2018-10-18 21:16
【摘要】：近年来,随着我国交通事业的迅猛发展,高等级公路开始进入西部山区,大跨径曲线刚构桥应运而生。大跨径曲线连续刚构桥结合了曲线梁桥和连续刚构桥的受力特点,由于“弯、剪、扭”耦合的受力特性,使得结构分析变得更为复杂。本文以湖北宜昌凉台河大桥为背景,采用大型通用有限元软件MIDAS/Civil2012建模并进行分析计算,针对大跨径曲线连续刚构桥收缩徐变和预应力损失主要做了以下几个方面的研究： (1)总结了曲线梁桥的发展史与现状,介绍了曲线刚构桥在我国的建设情况以及曲线刚构桥常用的分析理论。 (2)以凉台河大桥为工程背景,采用空间直梁单元并考虑曲率半径的影响,建立了凉台河大桥的有限元计算模型进行了施工阶段过程分析。 (3)通过凉台河大桥现场实测的各项监控数据与模型计算的理论值对比分析,表明MDAS/Civil能较好的模拟桥梁悬臂施工过程；本文所依据的分析理论和采用的计算方法能够较好的反映实际情况,对同类桥型的施工控制具有一定的参考价值。 (4)在只改变桥梁的曲率半径的前提下,分别建立了直线桥与多个曲线桥的空间计算模型,对不同曲率半径下的曲线连续刚构桥的收缩徐变效应进行了分析对比,得到了收缩徐变对曲线连续刚构桥内力和变.形的影响。 (5)通过改变桥梁的曲率半径,分析了大跨径曲线连续刚构桥的预应力损失,得到了不同曲率半径的曲线连续刚构桥的各项分项预应力损失并进行了对比分析。
[Abstract]:In recent years, with the rapid development of China's transportation industry, high-grade highways began to enter the western mountainous areas, and long-span curved rigid frame bridges emerged as the times require. The long-span curved continuous rigid frame bridge combines the stress characteristics of curved beam bridge and continuous rigid frame bridge. The structural analysis becomes more complicated because of the coupling force characteristics of "bending, shear and torsion". Based on the Liangtai River Bridge in Yichang, Hubei Province, the large scale finite element software MIDAS/Civil2012 is used to model and analyze and calculate. In this paper, the shrinkage creep and prestress loss of long-span curved continuous rigid frame bridges are studied in the following aspects: (1) the history and present situation of curved girder bridges are summarized. This paper introduces the construction situation of curved rigid frame bridge in China and the common analysis theory of curved rigid frame bridge. (2) taking Liangtai River Bridge as the engineering background, the space straight beam element is adopted and the influence of curvature radius is considered. The finite element calculation model of Liangtai River Bridge is established and analyzed during the construction stage. (3) the theoretical values of the monitoring data and the model calculation are compared and analyzed through the field monitoring data of Liangtai River Bridge. The results show that MDAS/Civil can simulate the cantilever construction process of bridge, and the analysis theory and calculation method used in this paper can better reflect the actual situation. It has certain reference value for the construction control of the similar bridge type. (4) on the premise of changing the curvature radius of the bridge, the spatial calculation models of the straight line bridge and several curved bridges are established respectively. The shrinkage and creep effects of curved continuous rigid frame bridges with different curvature radii are analyzed and compared, and the internal forces and changes of curved continuous rigid frame bridges are obtained. (5) by changing the curvature radius of the bridge, the prestressing loss of the long-span curved continuous rigid frame bridge is analyzed. The prestressing loss of curved continuous rigid frame bridge with different curvature radius is obtained and compared.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.5;U448.23
本文编号：2280376
[Abstract]:In recent years, with the rapid development of China's transportation industry, high-grade highways began to enter the western mountainous areas, and long-span curved rigid frame bridges emerged as the times require. The long-span curved continuous rigid frame bridge combines the stress characteristics of curved beam bridge and continuous rigid frame bridge. The structural analysis becomes more complicated because of the coupling force characteristics of "bending, shear and torsion". Based on the Liangtai River Bridge in Yichang, Hubei Province, the large scale finite element software MIDAS/Civil2012 is used to model and analyze and calculate. In this paper, the shrinkage creep and prestress loss of long-span curved continuous rigid frame bridges are studied in the following aspects: (1) the history and present situation of curved girder bridges are summarized. This paper introduces the construction situation of curved rigid frame bridge in China and the common analysis theory of curved rigid frame bridge. (2) taking Liangtai River Bridge as the engineering background, the space straight beam element is adopted and the influence of curvature radius is considered. The finite element calculation model of Liangtai River Bridge is established and analyzed during the construction stage. (3) the theoretical values of the monitoring data and the model calculation are compared and analyzed through the field monitoring data of Liangtai River Bridge. The results show that MDAS/Civil can simulate the cantilever construction process of bridge, and the analysis theory and calculation method used in this paper can better reflect the actual situation. It has certain reference value for the construction control of the similar bridge type. (4) on the premise of changing the curvature radius of the bridge, the spatial calculation models of the straight line bridge and several curved bridges are established respectively. The shrinkage and creep effects of curved continuous rigid frame bridges with different curvature radii are analyzed and compared, and the internal forces and changes of curved continuous rigid frame bridges are obtained. (5) by changing the curvature radius of the bridge, the prestressing loss of the long-span curved continuous rigid frame bridge is analyzed. The prestressing loss of curved continuous rigid frame bridge with different curvature radius is obtained and compared.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.5;U448.23
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