斜拉桥锚拉板式索梁锚固区受力性能足尺模型试验研究

发布时间：2019-02-17 14:53

【摘要】：近年来，伴随着我国交通基础设施大规模建设，大跨度斜拉桥的建设得到了快速发展。斜拉索的巨大索力斜向并集中地作用于索梁锚固结构，锚固区结构的安全是整个大桥安全的关键。因此对斜拉桥索梁锚固结构提出了更高要求。目前，斜拉桥的索梁锚固形式主要有锚管式、锚箱式、耳板式和锚拉板式四种。锚拉板具有构造简洁、便于加工、易于维护等独特优点，但锚固区受力集中、结构复杂，在设计荷载作用下可能出现塑性区域，车辆动荷载引起的疲劳问题也比较突出。只是通过空间有限元仿真计算，很难准确把握锚固点局部的实际受力状况。因此，通过足尺模型试验，深入研究锚拉板式索梁锚固结构的传力机理及疲劳可靠性是非常必要的。本文结合工程实例，对某斜拉桥锚拉板式索梁锚固结构进行了足尺模型静力和疲劳试验。具体研究内容分为以下几个方面。 1.简述了索梁锚固结构试验的国内外研究现状，重点介绍了锚拉板式索梁锚固结构的特点，对四种索梁锚固结构的传力路径进行了介绍。 2.通过对主桥整体结构的有限元仿真分析，，选取设计工况下最大斜拉索索力对应的索梁锚固区进行试验研究；建立所选索梁锚固区结构的局部有限元模型，考察锚固区结构的应力分布规律，优化试验模型的设计尺寸。 3.通过索梁锚固区结构足尺模型静力试验，研究锚拉板及钢箱梁在设计荷载作用下的实际工作性能。结合试验和仿真分析，进一步研究索梁锚固区各构件的力学性能，同时检验结构的抗超载能力和安全性。 4.根据国内外相关规范对疲劳荷载模型的规定，确定索梁锚固区结构疲劳试验的疲劳荷载。对索梁锚固区结构进行常幅疲劳试验，评估锚拉板式索梁锚固区结构的抗疲劳性能。 5.总结锚拉板式索梁锚固区足尺模型试验经验，采用ABAQUS对耳板式、钢锚箱式及锚管式三种索梁锚固结构进行数值模拟，通过理论分析，对比4种锚固结构的应力分布、传力机理、应力集中现象。本文的工作和成果可为以后锚拉板式索梁锚固区的相关设计提供参考。
[Abstract]:In recent years, with the large-scale construction of transportation infrastructure in China, the construction of long span cable-stayed bridge has been developed rapidly. The huge cable force of the cable-stayed cable acts on the anchoring structure of the cable beam. The safety of the Anchorage zone is the key to the safety of the bridge. Therefore, the cable-beam Anchorage structure of cable-stayed bridge is required higher. At present, cable-girder Anchorage of cable-stayed bridge mainly includes four types: pipe anchor, box anchor, ear plate and anchor plate. The anchor plate has the unique advantages of simple structure, easy processing and easy maintenance. However, the anchoring area is concentrated in force, the structure is complex, the plastic area may appear under the action of the design load, and the fatigue problem caused by the dynamic load of the vehicle is also prominent. Only through the spatial finite element simulation calculation, it is difficult to accurately grasp the actual stress condition of the anchoring point. Therefore, it is necessary to study the load transfer mechanism and fatigue reliability of anchor plate cable beam Anchorage structure through full-scale model test. Combined with an engineering example, the static and fatigue tests of a cable-stayed bridge Anchorage structure with anchor plate type cable beam are carried out in full scale model. Specific research content is divided into the following aspects. 1. This paper briefly introduces the research status of cable beam anchoring structure at home and abroad, introduces emphatically the characteristics of anchor structure of anchor plate type cable beam, and introduces the load transfer path of four cable beam anchoring structures. 2. Through the finite element simulation analysis of the whole structure of the main bridge, the cable beam anchoring zone corresponding to the maximum cable-stayed cable force under the design condition is selected for experimental study. The local finite element model of the selected cable beam Anchorage zone structure is established, the stress distribution law of the Anchorage zone structure is investigated, and the design dimension of the test model is optimized. 3. Based on the static test of full-scale model of cable-girder Anchorage zone structure, the practical performance of anchor plate and steel box girder under design load is studied. Combined with the test and simulation analysis, the mechanical properties of the members in the cable beam Anchorage zone are further studied, and the resistance to overload and the safety of the structure are also tested. 4. According to the rules of fatigue load model at home and abroad, the fatigue load of cable beam Anchorage zone structure is determined. In order to evaluate the fatigue resistance of cable beam Anchorage zone structure, a constant amplitude fatigue test was carried out on the cable beam Anchorage zone structure. 5. This paper summarizes the experience of full-scale model test in anchoring zone of anchor plate type cable beam, and uses ABAQUS to simulate three kinds of cable beam anchoring structure: ear-plate type, steel anchor box type and anchor tube type. Through theoretical analysis, the stress distribution and force transfer mechanism of four kinds of anchoring structures are compared. Stress concentration. The work and results of this paper can be used as reference for the design of Anchorage zone of anchor-plate cable-beam in the future.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27

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