斜拉桥锚固区应力仿真分析
发布时间：2018-11-16 11:09
【摘要】：斜拉桥的锚固区域内,斜拉索索力和锚具集中力都很大,所以这部分的受力比较复杂,必须严格设计、反复计算。通过有限元方法对其进行局部应力仿真分析,了解结构的应力分布特点,确保实际工作状态的安全是十分必要的。本文主要对索塔、索梁锚固区及主梁顶板进行受力仿真分析,了解其应力分布的特点并对其受力结构的安全性进行评估。论文主要从这四个方面着手：第一部分,简单介绍斜拉桥的发展历史,综述斜拉桥锚固区的锚固方式及其构造特点和应力分析研究现状。第二部分,了解背景工程索塔锚固区以及索梁锚固区的索梁锚固形式。第三部分,在完成全桥整体计算,详细了解全桥受力情况的基础上,选取不利的锚固区节段,确定各不利荷载组合时的受力情况以及边界条件,然后运用大型通用有限元分析软件ANSYS对不利锚固节段进行计算分析,了解锚固区应力分布的特点并且验算该节段成桥状态结构的安全性。其不利锚固区节段包括索塔锚固区节段及车行桥混凝土主梁节段、人行桥钢箱梁主梁节段。第四部分,通过本文计算的结果分析索塔、索梁锚固区应力分布的特点及成桥状态结构的安全性。本文计算结果分析表明,桥塔整体受力合理,但是在人行桥索塔锚固的锚板开孔处及车行桥索塔锚固的钢锚箱部分焊接处依然是有应力集中现象；人行桥的钢箱梁以及索梁锚固的钢锚箱应力水平都较低,均在规范规定范围之内；车行桥跨中断面主拉及主压应力值较小,在规范要求范围之内,车行桥斜拉索锚固端处局部计算应力较大。
[Abstract]:In the Anchorage area of cable-stayed bridge, the cable force and the concentrated force of anchor are very large, so the force of this part is complicated and must be designed strictly and calculated repeatedly. It is necessary to analyze the local stress by finite element method to understand the characteristics of the stress distribution of the structure and to ensure the safety of the actual working state. In this paper, the stress distribution characteristics of cable tower, cable beam Anchorage area and main beam roof are analyzed, and the safety of its stress structure is evaluated. In the first part, the development history of cable-stayed bridge is briefly introduced, and the anchoring mode, structural characteristics and stress analysis of cable-stayed bridge Anchorage area are summarized. In the second part, we understand the cable-beam anchoring area and the cable-beam Anchorage zone in the background engineering. In the third part, on the basis of the complete calculation of the whole bridge and the detailed understanding of the stress situation of the whole bridge, the section of the unfavorable Anchorage zone is selected to determine the stress situation and the boundary conditions when the unfavorable loads are combined. Then the finite element analysis software ANSYS is used to calculate and analyze the unfavorable Anchorage segment, to understand the characteristics of the stress distribution in the Anchorage zone and to check the safety of the state structure of the segmented bridge. The unfavorable anchoring section includes cable tower Anchorage section, vehicular bridge concrete main girder section, pedestrian bridge steel box girder section. In the fourth part, the characteristics of stress distribution in cable tower and cable beam Anchorage zone and the safety of bridge state structure are analyzed. The analysis of the calculation results shows that the overall stress of the bridge tower is reasonable, but there is still stress concentration in the open hole of anchoring plate of the bridge tower and in the welding place of the steel anchor box part of the anchor of the bridge tower. The stress level of steel box girder of pedestrian bridge and steel anchor box anchored by cable beam are all lower than those of steel anchor box, which are within the specified range of code. The stress of main tension and main compression of the middle section of vehicle bridge span is small, and the local calculation stress of cable Anchorage end of vehicle bridge is larger within the scope of specification.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27
本文编号：2335349
[Abstract]:In the Anchorage area of cable-stayed bridge, the cable force and the concentrated force of anchor are very large, so the force of this part is complicated and must be designed strictly and calculated repeatedly. It is necessary to analyze the local stress by finite element method to understand the characteristics of the stress distribution of the structure and to ensure the safety of the actual working state. In this paper, the stress distribution characteristics of cable tower, cable beam Anchorage area and main beam roof are analyzed, and the safety of its stress structure is evaluated. In the first part, the development history of cable-stayed bridge is briefly introduced, and the anchoring mode, structural characteristics and stress analysis of cable-stayed bridge Anchorage area are summarized. In the second part, we understand the cable-beam anchoring area and the cable-beam Anchorage zone in the background engineering. In the third part, on the basis of the complete calculation of the whole bridge and the detailed understanding of the stress situation of the whole bridge, the section of the unfavorable Anchorage zone is selected to determine the stress situation and the boundary conditions when the unfavorable loads are combined. Then the finite element analysis software ANSYS is used to calculate and analyze the unfavorable Anchorage segment, to understand the characteristics of the stress distribution in the Anchorage zone and to check the safety of the state structure of the segmented bridge. The unfavorable anchoring section includes cable tower Anchorage section, vehicular bridge concrete main girder section, pedestrian bridge steel box girder section. In the fourth part, the characteristics of stress distribution in cable tower and cable beam Anchorage zone and the safety of bridge state structure are analyzed. The analysis of the calculation results shows that the overall stress of the bridge tower is reasonable, but there is still stress concentration in the open hole of anchoring plate of the bridge tower and in the welding place of the steel anchor box part of the anchor of the bridge tower. The stress level of steel box girder of pedestrian bridge and steel anchor box anchored by cable beam are all lower than those of steel anchor box, which are within the specified range of code. The stress of main tension and main compression of the middle section of vehicle bridge span is small, and the local calculation stress of cable Anchorage end of vehicle bridge is larger within the scope of specification.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27
【参考文献】
相关期刊论文 前4条
1 陈辉;;斜拉桥索塔锚固区结构形式发展综述[J];赤子(上中旬);2014年11期
2 陈光华;;斜拉桥的发展现状与发展趋势[J];山西建筑;2008年19期
3 李丹;苏庆田;吴冲;孙旭霞;;锚箱式钢桥塔锚固区力学性能研究[J];结构工程师;2014年01期
4 李小珍,蔡婧,强士中;大跨度钢箱梁斜拉桥索梁锚固结构型式的比较研究[J];土木工程学报;2004年03期
，本文编号：2335349
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