斜拉桥悬臂拼装施工控制的虚实结合技术及模型试验

发布时间：2018-04-13 16:25

本文选题：斜拉桥悬臂拼装 + 数字图像检测　；参考：《广州大学》2017年硕士论文

【摘要】：斜拉桥相对于普通桥梁而言,施工过程繁杂且受外界干扰性大,设计与施工耦合性强,选择合适的施工方法和制定合理的监控方案对成桥线形和结构受力起到至关重要的作用。悬臂拼装是斜拉桥运用最为广泛的施工方法,但受施工过程中各种因素的影响,其结构内力及变形等变化规律较为复杂,为确保最终成桥线形和受力状态最大限度满足设计需求,施工控制尤为重要。传统的桥梁悬臂施工控制方法既费时费力,自动化程度又不高,很难达到理想的施工控制效果,本文在传统施工控制方法的基础上提出了“虚实结合”施工控制的技术理念,本技术理念是基于Matlab强大的图像处理功能和系统自带的虚拟仿真功能,即数字图像边缘检测技术和虚拟现实技术。最后通过实验室自加工斜拉桥实例来验证“虚实结合”施工控制技术的可行性。主要研究内容及研究成果如下:(1)详细介绍了数字图像检测技术的原理及实现方法,同时介绍了其在桥梁变形检测方面较传统测量方法的优势,并成功的将其应用在斜拉桥悬臂拼装各工况的位移识别上,将其识别结果与理论计算数据进行了对比分析,其变化趋势基本一致。(2)对虚拟现实技术进行了系统化研究,基于虚拟现实建模语言VRML建立虚拟现实仿真模型,通过Simulink动态仿真建模语言实现仿真模型的动态化;将实测结果与理论计算结果导入虚拟仿真环境,形象逼真的展示两者之间的差异;通过参数敏感性分析来确定主要设计参数,进而对有限元模型进行修正,得到准确合理的斜拉桥变形数据,为其施工控制提供了有效的数据参考。(3)基于数字图像检测技术、VRML虚拟建模技术、Simulink动态仿真技术和有限元分析技术,在传统施工控制方法的基础上提出了“虚实结合”施工控制的技术理念,将其试应用在某斜拉桥悬臂拼装施工控制中,取得了理想的控制效果,说明此次虚实结合施工控制的初次探索取得的较好的控制效果,为将来该技术运用到实际桥梁施工监控中提供了一定的理论参考价值。实践证明:基于数字图像处理技术和虚拟现实技术的虚实结合施工控制技术理念是合理有效的,它可以直观逼真的展现出施工控制各阶段实测结果与理论结果之间的误差,同时使两者之间的误差及时得到解决,并且其信息化和自动化程度较高,为将来实际桥梁施工控制提供了一种行之有效的施工控制方法。
[Abstract]:Compared with ordinary bridges, cable-stayed bridges have complex construction process and strong coupling between design and construction. It is very important to select appropriate construction methods and establish reasonable monitoring schemes for bridge alignment and structural stress.Cantilever assembly is the most widely used construction method for cable-stayed bridges. However, due to the influence of various factors in the construction process, the internal force and deformation of the structure are complicated.Construction control is particularly important to ensure that the final bridge alignment and stress state meet the design requirements to the maximum extent.The traditional bridge cantilever construction control method is time-consuming and laborious, and the degree of automation is not high, so it is difficult to achieve the ideal construction control effect. Based on the traditional construction control method, this paper puts forward the technical concept of "virtual reality combination" construction control.The idea of this technology is based on the powerful image processing function of Matlab and the virtual simulation function of the system, that is, digital image edge detection technology and virtual reality technology.Finally, the feasibility of the construction control technology of "virtual reality combination" is verified by the example of laboratory self-processing cable-stayed bridge.The main research contents and results are as follows: (1) the principle and implementation method of digital image detection technology are introduced in detail. At the same time, its advantages in bridge deformation detection are also introduced.It has been successfully applied to the displacement identification of cable-stayed bridge cantilever assembly under various working conditions. The result of recognition is compared with the theoretical calculation data. The trend of the change is basically consistent with that of the virtual reality. (2) the virtual reality technology is systematically studied.The virtual reality simulation model is established based on virtual reality modeling language VRML, the dynamic simulation model is realized by Simulink dynamic simulation modeling language, the measured result and the theoretical calculation result are imported into the virtual simulation environment.Through parameter sensitivity analysis, the main design parameters are determined, and then the finite element model is modified to obtain accurate and reasonable deformation data of cable-stayed bridge.It provides effective data reference for construction control.) based on digital image detection technology, VRML virtual modeling technology, Simulink dynamic simulation technology and finite element analysis technology.Based on the traditional construction control method, the paper puts forward the technical idea of "virtual reality combination" construction control, and applies it to the cantilever assembly construction control of a cable-stayed bridge, and obtains the ideal control effect.It is shown that the initial exploration of the combination of virtual reality and construction control has achieved better control effect, which provides a certain theoretical reference value for the application of this technology to the practical bridge construction monitoring in the future.The practice proves that the concept of virtual reality combined with construction control technology based on digital image processing and virtual reality technology is reasonable and effective, and it can show the errors between the measured and theoretical results in each stage of construction control intuitively and realistically.At the same time, the error between the two can be solved in time, and the degree of information and automation is high, which provides an effective construction control method for the actual bridge construction control in the future.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

【参考文献】