无背索斜拉桥空间受力分析与设计参数研究

发布时间：2018-06-13 13:47

本文选题：斜塔无背索斜拉桥 + 静力平衡　；参考：《安徽建筑大学》2016年硕士论文

【摘要】：随着斜拉桥的快速发展,催生了斜塔无背索斜拉桥的出现,其以合理的受力性能与独特造型的和谐统一,使得其在中小跨径的城市桥梁上备受推崇。目前世界上已建成的该类型桥还是为数不多,其理论基础与施工技术相对来说还不完善。在查阅国内外学者研究成果的基础上,本文对某斜塔无背索斜拉桥进行相关研究,并提供一定的参考价值。本文在参照已建成的无背索斜拉桥相关参数,充分解其结构特点以及其静力平衡分析流程,考虑施工阶段分析的基础上,建立某斜塔无背索斜拉桥,对成桥状态下的模型运行分析得出的内力值、位移值与规范相比较,确定该模型的准确性。前期准备工作完成后,利用已建成的模型,对无背索斜拉桥无论是设计中还是施工中容易出现的灵敏参数进行控制变量分析。具体分析主梁自重误差、主梁刚度误差、桥塔自重误差、斜拉索初张拉误差、整体温度误差、局部温度误差、材料的收缩徐变误差对成桥状态下的整桥的主梁挠度值、桥塔水平位移值、斜拉索索力值、主梁上缘应力值与主梁下缘应力值影响状况。在影响结果中,可以得出整体温度误差对于整桥结构的影响最为突出;主梁的刚度误差则是影响最不明显;主梁的上下缘应力值对于所有参数的扰动响应较为积极,桥塔的水平位移值均会发生不等的较大变化等等。上述所得结论对该类型桥梁的设计参数选取以及施工阶段误差控制提供一定的借鉴意义。随后在单一设计参数的误差分析的基础上进一步拓展,对于不同的设计参数误差进行非线性组合,以模仿动物的神经网络为出发点,分布式和信息的持续训练和学习,建立模型,敏感性分析,并用它来研究原始数据的不确定性或改变稳定性的最优解,也可以决定是否某些参数对模型有很大的影响。通过建立误差组合工况,与零误差状态下的结果进行比较,间接得到参数误差的影响权重,为后续的神经网络建立提供一定的参考。最后在本文研究的基础上,对斜塔无背索斜拉桥的结构体系创新提出建议。
[Abstract]:With the rapid development of cable-stayed bridge, the emergence of cable-stayed bridge with inclined tower without back cable, with the harmonious unity of reasonable mechanical performance and unique shape, makes it highly respected in medium and small span urban bridges. At present, there are few bridges of this type in the world, whose theoretical foundation and construction technology are not perfect. On the basis of consulting the research results of domestic and foreign scholars, this paper carries on the related research on a certain inclined tower cable-stayed bridge without back cable, and provides certain reference value. In this paper, referring to the relevant parameters of the completed cable-stayed bridge without back cables, the structural characteristics of the bridge and its static equilibrium analysis flow are fully solved, and on the basis of the analysis of the construction stage, a certain cable-stayed bridge without back cable with inclined tower is established. The accuracy of the model is determined by comparing the values of internal force and displacement between the model and the code. After the preparatory work has been completed, the control variables of the sensitive parameters of cable-stayed bridge without back cable are analyzed by using the established model. The main beam weight error, main beam stiffness error, bridge tower weight error, cable initial tension error, integral temperature error, local temperature error, shrinkage and creep error of material to the deflection value of the whole bridge under the condition of the bridge are analyzed in detail. The influence of the horizontal displacement of the bridge tower, the cable force, the stress value of the upper edge of the main beam and the stress value of the lower edge of the main beam are discussed. Among the results, it can be concluded that the whole temperature error has the most prominent influence on the whole bridge structure, the stiffness error of the main beam is the least obvious, and the stress value of the upper and lower edge of the main beam has a more positive response to the disturbance of all parameters. The horizontal displacement of the bridge tower will vary greatly and so on. The above conclusions can be used for reference in the selection of design parameters and error control in construction stage of this type of bridge. Then, based on the error analysis of single design parameter, the nonlinear combination of different design parameter errors is carried out, and the distributed and information continuous training and learning are taken as the starting point of imitating animal neural network. Modeling, sensitivity analysis, and using it to study the uncertainty of raw data or to change the optimal solution of stability can also determine whether certain parameters have a great impact on the model. The influence weight of parameter error is obtained indirectly by setting up the combined error condition and comparing with the result under zero error state, which provides a certain reference for the subsequent establishment of neural network. Finally, on the basis of the research in this paper, some suggestions on the structural system innovation of the cable-stayed bridge without back cable are put forward.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U448.27

【相似文献】