【作者】 唐堂；

【导师】 张永水；

【作者基本信息】 重庆交通大学 ， 桥梁与隧道工程， 2008， 硕士

【摘要】 高低塔单索面不对称斜拉桥结构型式新颖,受力特点区别于传统对称体系斜拉桥体系。为了解其合理成桥和施工状态下受力特点,通过仿真计算,对桥梁的成桥受力状态和施工受力状态进行模拟分析。本文以涪陵乌江二桥为工程背景,运用有限元分析软件Midas/Civil建立空间有限元模型,对该桥合理状态进行研究,同时编写了斜拉桥静力计算程序来解决这问题。本文主要的内容和结论如下:1)运用最小弯曲能量法结合影响矩阵及最小二乘法原理来确定该桥恒载下的合理成桥状态,并考虑活载下的合理成桥状态。计算结果表明该计算方法确定斜拉桥成桥状态是较为合理的。2)采用正装迭代法来确定斜拉桥施工初张索力,并使用差值法修正,取得了良好的效果。通过迭代计算,使正装的成桥索力与合理状态索力基本一致。表明这种方法确定斜拉桥施工状态是合理、有效的。3)斜拉桥合理状态受多种参数影响,本文对影响参数进行了敏感性分析,计算结果表明,梁段重量、几何非线性、混凝土收缩徐变和温度效应对该结构的影响具有特殊性,故应在确定斜拉桥合理状态时考虑上述因素。4)以平面杆系有限元法为基础,运用影响矩阵法以弯曲应变能最小为目标函数进行索力优化,确定斜拉桥成桥理想状态,用正装法确定斜拉桥施工理想状态。并在上述理论、方法的基础上,用面向对象的编程工具Visual Basic结合Visual Fortran编制了相应的计算分析软件。从而可以更方便、快捷地的确定斜拉桥合理状态。更多还原

【Abstract】 the structure system of the high and low towers cable-stayed bridge, takes single central cable plane and asymmetrical type, is novelty ,and the strength behavior of two-towers cable-stayed bridge is different from other traditonal two-towers cable-stayed bridges. In order to understand the strength behavior characteristic like this type the rational completion state.At the same time ,compile the cable-stated static program to solve the problem.this paper taking this bridge as background, by using finite element analysis software Midas/Civil to establish dimensional finite element models, analytical calculated the rational completion state.The main contents and conclusions of this thesis are as follows:1) The reasonable dead loads state is determined by the minimum bending energy method and cross interaction matrix, then modified the difference using least square method. This paper applied to determine the state under live loads.It indicates that determine the reasonable design state of cable-stayed bridge comprehensive consideration these theoretics is an ideal method.2) The initial cable forces are gained by the forward iteration method, then modified the difference using the difference method. The finished cable forces are consistent to that of the target state basically. Get through a few of iteration, this indicated determinate the construct state of bridge by it are reasonable and effective.3) The rational completion state of cable-stayed bridge is a process influencing by several parameter. For the sake of finding the main aspect ,this paper analysis the sensitivity of some parameters, the result indicates the beam weight, geometric non-linearity,the shrinkage and crape of concrete and temperatureare prominence, so these parameter must be considered during the rational completion state .4) Based on plane bar finite element, Ideal completed structure is deterinined by erect matrix method with choosing the strain energy of the structural system as optimum aim. Ideal state of construction is determined by forward-running analysis. Based on these theories and methods, construction control of cable-stayed Analysis System is developed by using object oriented programming tools, Visual Basic and Visual Fortran as tool. This program make the reasonable state of cable-stayed bridge become more convenience at any time.更多还原