斜拉—自锚式悬索桥中的斜置拱形钢箱混凝土索塔力学性能研究

发布时间：2018-05-13 17:52

本文选题：斜拉-自锚式悬索组合桥 + 钢箱混凝土　；参考：《长安大学》2014年硕士论文

【摘要】：斜拉-自锚式悬索组合结构外形特点鲜明，结构纤细美观，景观效果突出，是近几年出现的一种新颖的组合体系结构。由于本文提出的三塔斜拉-自锚式悬索组合桥国内外尚未有成熟的桥例，因此缺少设计经验、设计理论和方法，需要对其进行深入的研究。本文即在全桥体系研究的基础上，，深入探讨斜置拱形钢箱混凝土副塔的力学性能，按照构造设计、参数分析、平面分析、空间精细化分析的流程开展了详细的力学性能研究，得到如下主要结论：（1）开展钢箱混凝土斜置拱形桥塔构造参数研究，初步确定副塔主要构造参数；在桥梁整体分析的基础上，针对结构尺寸、钢板厚度和混凝土的贡献开展参数分析和研究，初步了解了副塔结构的力学特征。（2）忽略副塔上部锚固区的局部应力问题，以考察副塔整体受力状态为目的，进行了副塔整体空间有限元分析。计算结果表明，正常使用状态下，副塔钢箱最不利控制截面最大主拉应力为37.7MPa，最大主压应力为85.5MPa；副塔塔座混凝土最大主拉应力为1.34MPa，最大主压应力为8.05MPa，均小于规范设计值。（3）为了充分掌握副塔上部主缆及背索锚固区的力学性质，选取副塔C段钢箱最大索力部位进行局部精细化有限元分析，计算结果表明，锚具最大峰值主拉应力为199MPa，最大峰值主压应力为287MPa，属于垫板开孔处应力集中现象，范围极小；锚箱最大主拉应力值为56.3MPa，最大主压应力为108MPa，均小于规范规定的钢材容许应力值。研究结果表明，三塔斜拉-自锚式悬索组合桥斜置拱形副塔构造参数设计合理，整体即局部受力均满足规范要求，能够保证依托工程桥梁的安全运营。
[Abstract]:The cable-stayed self-anchored suspension cable composite structure is a new kind of composite system which is characterized by its distinctive shape, fine and beautiful structure and outstanding landscape effect. Because the three-tower cable-stayed self-anchored composite bridge presented in this paper has not yet had a mature bridge case at home and abroad, there is a lack of design experience, design theory and method, which need to be deeply studied. On the basis of the research of the whole bridge system, the mechanical properties of the concrete auxiliary tower of oblique arch box are deeply discussed in this paper. According to the flow chart of structural design, parameter analysis, plane analysis and spatial fine analysis, the mechanical properties of the concrete auxiliary tower of oblique arch box are studied in detail. The main conclusions are as follows: 1) to study the structural parameters of steel box concrete oblique arch tower, to determine the main structural parameters of auxiliary tower, and to carry out parameter analysis and research on the structural size, thickness of steel plate and contribution of concrete on the basis of the overall analysis of the bridge. The mechanical characteristics of the auxiliary tower structure are preliminarily understood. 2) ignoring the local stress problem in the Anchorage area of the upper part of the auxiliary tower, the finite element analysis of the whole space of the auxiliary tower is carried out in order to investigate the stress state of the auxiliary tower as a whole. The calculation results show that the maximum principal tensile stress of the most unfavorable control section of the auxiliary tower steel box is 37.7MPa, the maximum principal compressive stress is 85.5 MPa, and the maximum main tensile stress of concrete of the auxiliary tower seat is 1.34MPa and the maximum principal compressive stress is 8.05MPa, which is less than the design value of the code. 3) in order to fully grasp the mechanical properties of the upper main cable of the auxiliary tower and the anchoring area of the back cable, the local fine finite element analysis of the maximum cable force of the steel box in section C of the auxiliary tower is carried out. The calculation results show that, The maximum principal tensile stress of Anchorage is 199MPa, and the maximum principal compressive stress is 287MPa, which belongs to the phenomenon of stress concentration at the opening of the plate, and the maximum principal tensile stress of the anchor box is 56.3 MPA and the maximum principal compressive stress is 108MPa, which is less than the allowable stress of steel as stipulated in the code. The research results show that the structural parameters of the oblique arch auxiliary tower of the three-tower cable-stayed self-anchored composite bridge are reasonable and the integral or local force can meet the requirements of the code and can guarantee the safe operation of the bridge relying on the engineering.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.25

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