部分预应力混凝土梁在大跨度双塔斜拉桥上的应用研究
发布时间：2019-02-15 05:48
【摘要】：斜拉桥跨度不断增大和桥梁结构轻型化的趋势使其结构受力性能更为复杂,因此斜拉桥受力性能的进一步优化显得尤为必要。如何将受力性能更为合理优异的部分预应力混凝土梁应用于斜拉桥上,使斜拉桥结构受力性能和更为合理,这对完善混凝土斜拉桥设计理论、确保该类桥梁设计合理和结构安全具有重要意义。本论文以贵州省六冲河大桥为工程背景,采用大型有限元计算软件对该斜拉桥在全预应力混凝土梁和部分预应力混凝土梁两种设计下的主梁在各种不同状态下的应力进行了系统地分析,对部分预应力混凝土梁在大跨度双塔斜拉桥上的应用进行了较为深入的研究。论文主要工作有：(1)论文介绍了斜拉桥和部分预应力结构的国内外研究现状及发展趋势；在查阅大量国内外设计方法及标准的基础上,论述了斜拉桥设计的基本方法和部分预应力混凝土结构设计的方法；介绍了预应力混凝土结构的裂缝宽度计算方法和理论。(2)根据工程实际建立了按全预应力混凝土主梁设计的全桥MIDAS和BDCMS有限元模型以及建立了优化后的按部分预应力混凝土主梁设计的全桥有限元模型,并按照相关规范对两者进行了验算,对结构的合理性进行了较为全面的评判。验算结果表明了该桥两种预应力配筋设计下主梁都是安全可靠的。同时各模型间的分析结果得到了相互验证,证明了各模型的可靠性。(3)对全预应力混凝土主梁模型与部分预应力混凝土主梁进行了对比分析,主要是预应力配置、整体受力特点及应力状况的分析比较；对部分预应力混凝土主梁设计的该桥在汽车荷载超载一倍的极限状况下进行了裂缝宽度计算,进一步确保了部分预应力混凝土主梁在斜拉桥上应用的可行性。本论文论证了部分预应力混凝土梁在斜拉桥上的应用是合理的、安全可行的,得到了斜拉桥预应力设计的一些结论,对斜拉桥的预应力设计具有指导作用。
[Abstract]:The increasing span of cable-stayed bridge and the tendency of lightening of bridge structure make the mechanical performance of cable-stayed bridge more complicated, so it is necessary to optimize the performance of cable-stayed bridge. How to apply the partially prestressed concrete beam which is more reasonable and excellent to the cable-stayed bridge in order to make the structure of the cable-stayed bridge more reasonable, which is helpful to perfect the design theory of the concrete cable-stayed bridge. It is of great significance to ensure the reasonable design and structural safety of this kind of bridge. This paper takes the Liuchong River Bridge in Guizhou Province as the engineering background. The stress of the main beam of the cable-stayed bridge under the design of the fully prestressed concrete beam and the partially prestressed concrete beam is analyzed systematically by using the large-scale finite element calculation software. The application of partially prestressed concrete beam in long span double tower cable-stayed bridge is studied. The main work of this paper is as follows: (1) the paper introduces the research status and development trend of cable-stayed bridges and partially prestressed structures at home and abroad; On the basis of consulting a large number of design methods and standards at home and abroad, this paper discusses the basic design method of cable-stayed bridge and the design method of partially prestressed concrete structure. This paper introduces the calculation method and theory of crack width of prestressed concrete structure. (2) according to the engineering practice, the MIDAS and BDCMS finite element models of the whole bridge designed according to the whole prestressed concrete main beam and the optimized section are established. The finite element model of the whole bridge for the design of the prestressed concrete main beam, The rationality of the structure is evaluated comprehensively according to the relevant codes. The results show that the main beam of the bridge is safe and reliable under the design of two kinds of prestressed tendons. At the same time, the analysis results of each model are verified mutually, which proves the reliability of each model. (3) the model of fully prestressed concrete main beam and the partially prestressed concrete main beam are compared and analyzed. Analysis and comparison of the stress characteristics and stress status of the whole body; The crack width of the partially prestressed concrete main girder is calculated under the limit condition of double overload of vehicle load, which ensures the feasibility of the application of the partially prestressed concrete main beam on the cable-stayed bridge. In this paper, the application of partially prestressed concrete beam in cable-stayed bridge is proved to be reasonable, safe and feasible, and some conclusions of prestressed design of cable-stayed bridge are obtained, which can guide the prestressed design of cable-stayed bridge.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
，
本文编号：2423030
[Abstract]:The increasing span of cable-stayed bridge and the tendency of lightening of bridge structure make the mechanical performance of cable-stayed bridge more complicated, so it is necessary to optimize the performance of cable-stayed bridge. How to apply the partially prestressed concrete beam which is more reasonable and excellent to the cable-stayed bridge in order to make the structure of the cable-stayed bridge more reasonable, which is helpful to perfect the design theory of the concrete cable-stayed bridge. It is of great significance to ensure the reasonable design and structural safety of this kind of bridge. This paper takes the Liuchong River Bridge in Guizhou Province as the engineering background. The stress of the main beam of the cable-stayed bridge under the design of the fully prestressed concrete beam and the partially prestressed concrete beam is analyzed systematically by using the large-scale finite element calculation software. The application of partially prestressed concrete beam in long span double tower cable-stayed bridge is studied. The main work of this paper is as follows: (1) the paper introduces the research status and development trend of cable-stayed bridges and partially prestressed structures at home and abroad; On the basis of consulting a large number of design methods and standards at home and abroad, this paper discusses the basic design method of cable-stayed bridge and the design method of partially prestressed concrete structure. This paper introduces the calculation method and theory of crack width of prestressed concrete structure. (2) according to the engineering practice, the MIDAS and BDCMS finite element models of the whole bridge designed according to the whole prestressed concrete main beam and the optimized section are established. The finite element model of the whole bridge for the design of the prestressed concrete main beam, The rationality of the structure is evaluated comprehensively according to the relevant codes. The results show that the main beam of the bridge is safe and reliable under the design of two kinds of prestressed tendons. At the same time, the analysis results of each model are verified mutually, which proves the reliability of each model. (3) the model of fully prestressed concrete main beam and the partially prestressed concrete main beam are compared and analyzed. Analysis and comparison of the stress characteristics and stress status of the whole body; The crack width of the partially prestressed concrete main girder is calculated under the limit condition of double overload of vehicle load, which ensures the feasibility of the application of the partially prestressed concrete main beam on the cable-stayed bridge. In this paper, the application of partially prestressed concrete beam in cable-stayed bridge is proved to be reasonable, safe and feasible, and some conclusions of prestressed design of cable-stayed bridge are obtained, which can guide the prestressed design of cable-stayed bridge.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
，
本文编号：2423030
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