考虑桥面板与钢桁架共同作用时桥梁力学特性影响研究

发布时间：2018-05-02 14:04

本文选题：斜拉桥 + 桥面板　；参考：《重庆交通大学》2015年硕士论文

【摘要】：斜拉桥又称斜张桥,属于组合体系桥梁,是由承压的塔、受拉的索和承弯的梁体组合起来的一种结构体系。钢桁斜拉桥由正交异性钢桥面板和钢桁架组成主梁,由于其特殊形式的主梁空间结构适应布置双层桥面的需要,且其抗弯刚度大,综合高效性能比较突出,在公铁两用斜拉桥中获得广泛应用。但目前关于这种结构型式桥梁力学研究可供参考的文献极少,对于考虑桥面板与钢桁架共同作用时桥梁的力学特性尚不明朗。为全面了解其受力特性,本文对此进行了研究。本文以东水门大桥为工程背景,围绕钢桁斜拉桥进行了三个方面的论述。第一部分主要介绍了斜拉桥和钢桁斜拉桥的发展历史以及目前的研究手段和方法,第二部分主要介绍了运用Midas Civil软件对全桥进行建模的过程,分析了建模过程中所需的注意问题,如何正确选取结构单元属性,构件连接问题以及大桥边界条件、荷载布置等。第三部分是整个论文的核心部分,在前期建模过程中,通过桥面板与钢桁架两种不同的连接方式,模拟桥面板和钢桁架是否共同作用。再对比分析大桥在成桥恒载作用以及运营状态两种不同的荷载工况下,大桥上弦杆、下弦杆、中纵梁、桥面板、斜腹杆和斜拉索的受力情况,以及大桥在恒载作用下的振型、自振频率和活载作用下的竖向挠度和竖向转角的差异,并得到以下研究成果:①钢桁梁主桁杆件在考虑桥面板和钢桁架共同作用时的内力要较不考虑共同作用时小,桥面板内力要较之大,研究表明桥面板不仅作为支承汽车轮载的结构,而且也作为主梁的一部分分担主梁的内力。②斜腹杆和斜拉索在考虑是否共同作用时对内力几乎没有影响。③在考虑桥面板和钢桁架共同作用的情况下大桥自振频率要比不考虑共同作用大,活载作用下的竖向挠度和竖向转角要比后者小,研究表明桥面板和钢桁架共同作用提高了大桥的刚度,有利于大桥受力。
[Abstract]:Cable-stayed bridge, also known as skew bridge, is a kind of structural system which is composed of compression tower, tension cable and curved beam. Steel truss cable-stayed bridge is composed of orthotropic steel bridge face slab and steel truss. Due to its special form of space structure of main beam to meet the needs of the arrangement of double-deck bridge deck, and its bending stiffness is large, the comprehensive and efficient performance is relatively outstanding. It is widely used in the cable-stayed bridge. However, there are few references on the mechanical research of this type of bridge, and the mechanical properties of the bridge considering the interaction of deck slab and steel truss are not clear. In order to fully understand its mechanical characteristics, this paper has carried on the research. In this paper, three aspects of steel truss cable-stayed bridge are discussed. The first part mainly introduces the development history of cable-stayed bridge and steel truss cable-stayed bridge, and the current research methods and methods. The second part mainly introduces the process of modeling the whole bridge by using Midas Civil software. The attention problems in modeling process are analyzed, and how to correctly select the properties of structural elements, the connection problem of members, the boundary conditions of the bridge, the load arrangement and so on are analyzed. The third part is the core part of the whole paper. In the early modeling process, the bridge deck slab and steel truss are connected in two different ways to simulate whether the bridge deck slab and steel truss work together. Then, under two different load conditions, the upper chord, the lower chord, the middle longitudinal beam, the deck slab, the inclined web bar and the stay cable, and the vibration mode of the bridge under dead load, the bridge is subjected to dead load and operation. The difference between the vertical deflection and the vertical rotation angle under the action of natural vibration frequency and live load is obtained. The following research results are obtained: the internal force of the main truss member of the steel truss beam: 1 is smaller when considering the joint action of the bridge deck plate and the steel truss structure than when the joint action is not taken into account. The internal force of the bridge deck is larger than that of the bridge deck. The research shows that the bridge deck is not only used as the structure supporting the wheel load of the vehicle, And as a part of the main beam, the internal force .2 the inclined web bar and the stay cable have little effect on the internal force when considering whether or not to act together. 3. 3. When considering the joint action of the deck slab and the steel truss, the bridge natural vibration is hardly affected. More often than not, The vertical deflection and vertical rotation angle under live load are smaller than that of the latter. The research shows that the joint action of deck slab and steel truss improves the stiffness of the bridge and is beneficial to the bridge force.
【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】：U448.27

【参考文献】