笋溪河大跨悬索桥静动力分析

发布时间：2018-03-14 15:11

本文选题：悬索桥　切入点：静力计算分析　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：悬索桥作为跨越能力最强的桥型,在很多跨越河流、峡谷和海峡的桥梁项目中成了不可缺少的比选方案之一。我国做为迅速崛起的桥梁大国,越来越多的悬索桥项目不断涌现出来。虽然悬索桥的设计理论一直在不断发展,同时许多问题仍然需要进一步的研究。本文针对单跨吊钢箱梁悬索桥进行研究,分析大跨度悬索桥的静动力特点。1、本文首先介绍了国内外悬索桥的发展历程,总结了主要国家悬索桥梁的风格和特点。介绍了当今世界悬索桥的体系发展以及主缆、加劲梁等新的结构形式。并且概述了未来悬索桥在设计和施工应注意的问题。2、详细阐述了悬索桥的弹性理论、挠度理论和有限位移理论等三大计算理论和方法。3、结合笋溪河特大桥桥址的地形、地貌、地质和水文条件,进行方案比选；同时针对钢桁加劲梁桥面系结构方案进行了技术研究。4、采用MIDAS软件建立全桥模型进行空间模型设计计算,进行包括缆、塔、吊索、加劲梁等主要承重结构的静力计算分析。其中包括：①通过各种作用效应组合下的结构内力及位移分析,提出结构设计所需要的主缆及吊索的控制拉力、加劲梁及桥塔各截面的内力和控制截面的竖向挠度及水平变位、支座反力、梁端转角及纵向位移。②根据设计成桥线形、恒载状况推算空缆线形,计算索股无应力长度、鞍座预偏量、索股初始张力、索夹位置及吊索无应力长度。③配合施工架设,计算各施工阶段的主缆线形、加劲梁空间位置及桥塔内力及变形等。5、对笋溪河特大桥锚碇进行整体稳定性分析及局部分析,分析内容包含抗滑稳定性、抗倾覆定性、锚块斜截面验算、锚固系统验算以及侧墙验算。6、对笋溪河特大桥进行桥址区风特性和设计风参数研究,同时采用三维空间有限元模型进行了结构抗风动力特性分析。7、对笋溪河特大桥进行抗震研究动力分析,模型采用三维空间有限元分析模型进行反应谱分析。
[Abstract]:As the most capable bridge type, suspension bridge has become one of the indispensable bridge projects across rivers, canyons and straits. More and more suspension bridge projects have been emerging. Although the design theory of suspension bridge has been developing, many problems still need to be further studied. The static and dynamic characteristics of long-span suspension bridges are analyzed. Firstly, the development history of suspension bridges at home and abroad is introduced, and the style and characteristics of suspension bridges in main countries are summarized. The system development and main cables of suspension bridges in the world are introduced. Some new structural forms, such as stiffened beam, etc., and the problems needing attention in the design and construction of the future suspension bridge are summarized, and the elastic theory of the suspension bridge is expounded in detail. Deflection theory and finite displacement theory. 3. Combining the topographic, geomorphological, geological and hydrological conditions of the bridge site of the Zhuxi River Bridge, the schemes are compared and selected. At the same time, based on the technical research of steel truss stiffened beam deck structure, the whole bridge model is built by MIDAS software, and the spatial model is designed and calculated, which includes cable, tower, sling, etc. The static calculation and analysis of the main load-bearing structures such as stiffening beams, including the analysis of the internal forces and displacements of the structures under the combination of various action effects, are included, and the control pull forces of the main cables and slings needed for the structural design are put forward. The internal force of each section of stiffened beam and tower and the vertical deflection and horizontal displacement of the control section, the reaction force of the support, the rotation angle of the beam and the longitudinal displacement .2 are calculated according to the design of the bridge line shape, the dead load condition calculates the cable line shape, and the unstressed length of the cable strands is calculated. The saddle pre-deflection, the initial tension of cable strands, the position of cable clamps and the length of sling without stress are set up together with the construction to calculate the main cable shape in each construction stage. The space position of stiffened beam, the internal force and deformation of the bridge tower, etc. 5. The overall stability analysis and local analysis of the Anchorage of the super large bridge in Chuanxihe are carried out. The contents of the analysis include the anti-slide stability, the anti-overturning qualitative analysis, and the checking calculation of the inclined section of the anchor block. Anchorage system checking calculation and side wall checking calculation. 6. The wind characteristics and design wind parameters of the bridge site area of the Zhuxihe River Bridge are studied. At the same time, three dimensional finite element model is used to analyze the dynamic characteristics of the structure against wind. 7. The seismic analysis of the Chuanxihe Bridge is carried out. The response spectrum of the model is analyzed by using the three-dimensional finite element analysis model.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.25

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