大跨斜拉桥计算分析与研究

发布时间：2018-05-15 19:49

本文选题：斜拉桥 + 参数敏感性　；参考：《合肥工业大学》2017年硕士论文

【摘要】：斜拉桥是现代大跨度桥梁的首选桥型之一。随着斜拉桥跨度的增大,对斜拉桥设计、施工过程中相关问题的研究愈发显得迫切和重要。本文以宣城市在建的水阳江混凝土斜拉桥为背景,重点研究了以下内容:首先介绍了斜拉桥在国内外的发展历程、斜拉桥结构体系与受力特点、斜拉桥的发展趋势,及本论文的工程背景及研究内容。其次,运用有限元分析软件建立了全桥计算模型并对模型参数的取值进行了说明。对该桥进行施工阶段的正装计算,分析了各施工阶段主梁内力、变形、主塔偏位及斜拉索索力等响应。再次,研究不同结构设计参数对斜拉桥最大悬臂状态和成桥状态响应的影响程度,从而识别出敏感性参数。有助于在施工控制过程中对敏感性参数进行重点监控,以确保合龙精度及成桥状态结构内力及线形达到设计要求。然后,综合考虑前支点挂篮与主梁的受力安全,确定了斜拉桥悬浇施工过程中的索力值。运用有限元软件模拟斜拉桥悬臂浇筑的前、后支点挂篮施工方法,并对主梁截面的内力、变形及索力变化进行比较。分析了斜拉索自重垂度效应对其倾角和索力的影响,得到名义索力与施工张拉索力的关系,为施工索力张拉调整提供理论依据。最后,分别采用中国2004规范、中国1985规范、CEB-FIP 1990规范及日本规范推荐的混凝土收缩徐变模型,分析了相对环境湿度变化对收缩徐变效应的影响;通过分析收缩徐变在各工况下对索力的影响,得出在考虑收缩徐变作用的情况下,斜拉桥从施工到成桥运营的索力变化规律。
[Abstract]:Cable-stayed bridge is one of the preferred bridge types for modern long span bridges. With the increase of the span of cable-stayed bridge, it is more and more urgent and important to study the related problems in the design and construction of cable-stayed bridge. Based on the construction of Shuiyang River concrete cable-stayed bridge in Xuancheng, this paper focuses on the following contents: firstly, the development history of cable-stayed bridge at home and abroad, the structural system and mechanical characteristics of cable-stayed bridge, and the development trend of cable-stayed bridge are introduced. And the engineering background and research content of this paper. Secondly, the calculation model of the whole bridge is established by using finite element analysis software and the values of the model parameters are explained. The internal force, deformation, deflection of the main tower and cable force of the main girder are analyzed in the construction stage of the bridge. Thirdly, the influence of different structural design parameters on the maximum cantilever state and bridge state response of cable-stayed bridge is studied, and the sensitivity parameters are identified. It is helpful to monitor the sensitive parameters in the process of construction control so as to ensure the precision of closure and the internal force and line shape of the bridge state structure to meet the design requirements. Then, considering the stress safety of front fulcrum hanging basket and main beam, the cable force value in the construction process of cable-stayed bridge is determined. The finite element software is used to simulate the construction method of front and rear fulcrum basket of cable-stayed bridge cantilever, and the variation of internal force, deformation and cable force of main beam section is compared. The effect of deadweight sag on the inclination angle and cable force is analyzed, and the relationship between nominal cable force and construction tension is obtained, which provides a theoretical basis for the adjustment of construction cable tension. Finally, the concrete shrinkage and creep models recommended by China 2004 Code, China 1985 Code CEB-FIP 1990 Code and Japanese Code are used to analyze the effect of relative humidity change on shrinkage and creep effect. By analyzing the influence of shrinkage and creep on cable force under various working conditions, the variation law of cable force of cable-stayed bridge from construction to operation is obtained under the consideration of shrinkage and creep.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.27

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