异形预应力混凝土连续梁桥实用设计方法研究

发布时间：2018-02-22 09:42

本文关键词： 异形梁 ANSYS 空间受力分析田口法偏载系数　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着交通事业的快速发展,现有的城市道路桥梁已经不能满足人们的需求,立交桥和平面交叉桥梁形式被广泛应用,因此产生了很多平面不规则的桥梁结构,这种不规则的桥梁形式统称为异形梁。异形梁结构受力复杂,计算理论和设计方法较直梁相比相对落后。因此,对异形梁的设计方法进行研究是非常必要的。本文首先对异形桥结构的国内外研究现状进行了阐述,然后利用有限元软件建立了两种典型异形桥的实体单元模型,进而对异形梁开展了一系列工作。1.对两种典型异形梁在自重、预应力、汽车荷载以及荷载组合作用下的静力响应进行分析,明确异形梁受力特性,探讨异形箱梁桥的空间效应,为此类桥梁的设计提出一些建议。2.对异形梁的影响参数进行分析。分别就匝道半径、截面高度以及暗横梁厚度三个参数变化时对主梁受力影响进行了分析,并利用田口实验法对三个参数进行实验设计,明确三个参数共同变化时对主梁受力特性的影响,并根据田口理论得到各参数对结构受力的影响程度。3.利用有限元法分别求得两种结构控制截面在不同参数下的偏载系数,并总结出偏载系数与各设计参数的关系,进而指导结构的设计;并与传统方法对比,说明将本文方法用在实际工程中具有实际意义。4.就不分叉结构和分叉结构异形梁,分别选择两种结构的实体工程,对本文得到的一些结论和实际工程实测数据对比,验证本文方法的正确性。
[Abstract]:With the rapid development of traffic, the existing urban road bridges can no longer meet the needs of people, the overpass and plane crossing bridges are widely used, so many irregular plane bridge structures have emerged. This irregular form of bridge is referred to as special-shaped beam. The structure of special-shaped beam is complicated by force, and the calculation theory and design method are relatively backward than that of straight beam. It is very necessary to study the design method of special-shaped beam. Firstly, the present research situation of special-shaped bridge structure at home and abroad is expounded, and then the solid element models of two typical special-shaped bridges are established by using finite element software. Then, a series of work on special-shaped beam is carried out. 1. The static response of two typical special-shaped beams under the action of deadweight, prestress, automobile load and combination of loads is analyzed, and the stress characteristics of special-shaped beams are clarified, and the spatial effects of special-shaped box girder bridges are discussed. Some suggestions are put forward for the design of this kind of bridge. 2. The influence parameters of special-shaped beam are analyzed. The influence of three parameters such as ramp radius, section height and the thickness of dark beam on the force of the main beam is analyzed respectively. The experimental design of the three parameters is carried out by using the Taguchi experimental method, and the influence of the three parameters on the mechanical characteristics of the main beam is clarified when the three parameters change together. According to the Taguchi theory, the influence degree of each parameter on the structural force is obtained. 3. Using the finite element method, the deflection load coefficients of the two structural control sections under different parameters are obtained, and the relationship between the eccentric load coefficients and the design parameters is summarized. Then the design of the structure is guided, and compared with the traditional method, it is shown that the application of this method in practical engineering has practical significance .4. for non-bifurcation structure and forked structural special-shaped beam, two kinds of structural solid engineering are selected, respectively. Some conclusions obtained in this paper are compared with actual engineering data to verify the correctness of this method.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.35

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