大跨度铁路钢桁梁斜拉桥梁体传力特性研究
发布时间：2018-11-19 14:45
【摘要】：因钢桁斜拉桥具有良好的强度和刚度,近年来已不断应用于大跨度铁路桥梁。虽然铁路钢桁梁斜拉桥的钢桁梁在荷载及整体变形等作用下局部在竖向及纵向传力显得较为复杂,但已有多种不同的桥面系构造如密肋横梁、正交异性桥面等结构来降低桥面系局部复杂的受力与传力。新建铁路贵广线(贵阳至广州)北江特大双塔钢桁梁斜拉桥为国内首次采用带水平K撑的纵横梁体系的桥例,克服传统简支钢桁梁纵横梁桥面系受力的复杂性,改善了节点横梁的受力状态。本文以北江桥为工程背景,在参阅国内外钢桁梁斜拉桥桥面系结构特点及受力分析相关文献资料的基础上开展带水平K撑结构局部受力与传力特点分析研究。本文主要研究内容和得出结论如下：(1)采用Midas有限元方法,对北江桥桥面系中的水平K撑结构进行计算分析,分析结果表明水平K撑以受轴力(即传递水平纵向力)为主。(2)在水平K撑桥面系(KS)方案的基础上,提出密布横梁桥面系(DC)方案,对比分析两种桥面系方案桥面构造的受力和变形特点。经计算分析得出在KS方案与DC方案共有的桥面系结构(下弦杆和节点横梁)中,KS方案的受力小于DC方案的受力。KS方案的主跨挠跨比为DC方案的94%,表明KS方案整体刚度大于DC方案。KS方案的节间16短波和横波分别为DC方案的94%、94%,节间25短波和横波分别为DC方案的88%、76%,表明KS方案的桥面系局部刚度(以轨道变形的短波和横波作为评价指标)优于DC方案。(3)分析了两种桥面系方案(KS和DC)的传力路径。在二期恒载(均布荷载)传力分析中,对比两种桥面系方案混凝土桥面部分的传力比,KS方案路径1(桥面载荷直接通过节点横梁传递到下弦梁)的传力比比DC方案的小4.56-9.52%,表明KS方案节点横梁的受力优于DC方案。在最不利活载的传力分析中,对比两种桥面系方案主跨钢桥面部分的传力比,KS方案路径1的传力比比DC方案的小4.92%-8.13%,即KS方案的节点横梁承担的桥面荷载小于DC方案的。(4)在第4章基础上,分析了水平K撑截面形式、水平K撑刚度及节点横梁刚度等关键结构设计参数对钢桁梁桥面荷载传力的影响,结果表明T形K撑受力优于倒T形和十字形,同时在保证用钢量不变的情况下,直接通过节点横梁传递的桥面荷载与节点横梁的刚度呈正相关。最后,根据以上研究得到的相关结论,提出了一些建议措施,为今后同类铁路钢桁梁斜拉桥的发展研究提供参考。
[Abstract]:Steel truss cable-stayed bridge has been applied to long span railway bridges in recent years because of its good strength and stiffness. Although the local vertical and longitudinal force transfer of the steel truss beams of railway steel truss cable-stayed bridges is more complicated under the action of load and integral deformation, there are many different deck structures such as multi-ribbed beams. Orthotropic bridge deck and other structures to reduce the local complex bridge deck force and transmission force. For the first time in China, the newly built Gui-Guang Railway (Guiyang to Guangzhou) Beijiang double-tower steel truss girder cable-stayed bridge is the first bridge with horizontal K-braced longitudinal and transverse beam system, which overcomes the complexity of the traditional simply supported steel truss girder deck system. The stress state of the joint beam is improved. Based on the reference to the structural characteristics of steel truss girder cable-stayed bridge deck system at home and abroad and the relevant literature data on force analysis, the characteristics of local force and transmission force of horizontal K-braced bridge are analyzed and studied in this paper. The main contents and conclusions of this paper are as follows: (1) the horizontal K-braced structure in the bridge deck system of Beijiang Bridge is calculated and analyzed by using Midas finite element method. The results show that horizontal K-braces are mainly subjected to axial force (i.e. transfer horizontal longitudinal force). (2) on the basis of (KS) scheme of horizontal K-braced bridge deck system, a (DC) scheme for dense cross beam deck system is proposed. The stress and deformation characteristics of two deck systems are compared and analyzed. Through calculation and analysis, it is concluded that in the bridge deck structure (lower chord and joint beam) shared by KS scheme and DC scheme, the stress of KS scheme is less than that of DC scheme, and the ratio of main span to span of KS scheme is 94% of DC scheme. The results show that the overall stiffness of the KS scheme is greater than that of the DC scheme. The internode 16 shortwave and the shear wave of the KS scheme are 94 / 9410 of the DC scheme, respectively, and the Internode 25 shortwave and the shear wave are 88 / 76 of the DC scheme, respectively. It is shown that the local stiffness of the KS scheme is superior to that of the DC scheme. (3) the transmission paths of the two bridge deck systems (KS and DC) are analyzed. In the second stage dead load (uniform load) force transfer analysis, the ratio of transfer force of concrete deck part of two bridge deck systems is compared. Path 1 of the KS scheme (the bridge deck load is transferred directly through the joint beam to the lower chord beam) is 4.56-9.52 smaller than that of the DC scheme, which indicates that the stress of the KS scheme is better than that of the DC scheme. In the analysis of the most unfavorable live load, the ratio of transmission force of the main span steel deck part of the two bridge deck systems is compared. The transfer force ratio of path 1 of KS scheme is 4.92-8.13 smaller than that of DC scheme. That is, the load on the bridge deck of the joint beam of the KS scheme is smaller than that of the DC scheme. (4) on the basis of Chapter 4, the section form of horizontal K brace is analyzed. The influence of key structural design parameters, such as horizontal K brace stiffness and joint beam stiffness, on load transfer of steel truss bridge deck is studied. The results show that T K brace is superior to inverted T shape and cross shape, and at the same time, under the condition that the amount of steel used is not changed, The bridge deck load transmitted directly through the joint beam is positively correlated with the stiffness of the joint beam. Finally, based on the conclusions of the above research, some suggestions are put forward to provide a reference for the development of similar railway steel truss cable-stayed bridges in the future.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27;U441
本文编号：2342655
[Abstract]:Steel truss cable-stayed bridge has been applied to long span railway bridges in recent years because of its good strength and stiffness. Although the local vertical and longitudinal force transfer of the steel truss beams of railway steel truss cable-stayed bridges is more complicated under the action of load and integral deformation, there are many different deck structures such as multi-ribbed beams. Orthotropic bridge deck and other structures to reduce the local complex bridge deck force and transmission force. For the first time in China, the newly built Gui-Guang Railway (Guiyang to Guangzhou) Beijiang double-tower steel truss girder cable-stayed bridge is the first bridge with horizontal K-braced longitudinal and transverse beam system, which overcomes the complexity of the traditional simply supported steel truss girder deck system. The stress state of the joint beam is improved. Based on the reference to the structural characteristics of steel truss girder cable-stayed bridge deck system at home and abroad and the relevant literature data on force analysis, the characteristics of local force and transmission force of horizontal K-braced bridge are analyzed and studied in this paper. The main contents and conclusions of this paper are as follows: (1) the horizontal K-braced structure in the bridge deck system of Beijiang Bridge is calculated and analyzed by using Midas finite element method. The results show that horizontal K-braces are mainly subjected to axial force (i.e. transfer horizontal longitudinal force). (2) on the basis of (KS) scheme of horizontal K-braced bridge deck system, a (DC) scheme for dense cross beam deck system is proposed. The stress and deformation characteristics of two deck systems are compared and analyzed. Through calculation and analysis, it is concluded that in the bridge deck structure (lower chord and joint beam) shared by KS scheme and DC scheme, the stress of KS scheme is less than that of DC scheme, and the ratio of main span to span of KS scheme is 94% of DC scheme. The results show that the overall stiffness of the KS scheme is greater than that of the DC scheme. The internode 16 shortwave and the shear wave of the KS scheme are 94 / 9410 of the DC scheme, respectively, and the Internode 25 shortwave and the shear wave are 88 / 76 of the DC scheme, respectively. It is shown that the local stiffness of the KS scheme is superior to that of the DC scheme. (3) the transmission paths of the two bridge deck systems (KS and DC) are analyzed. In the second stage dead load (uniform load) force transfer analysis, the ratio of transfer force of concrete deck part of two bridge deck systems is compared. Path 1 of the KS scheme (the bridge deck load is transferred directly through the joint beam to the lower chord beam) is 4.56-9.52 smaller than that of the DC scheme, which indicates that the stress of the KS scheme is better than that of the DC scheme. In the analysis of the most unfavorable live load, the ratio of transmission force of the main span steel deck part of the two bridge deck systems is compared. The transfer force ratio of path 1 of KS scheme is 4.92-8.13 smaller than that of DC scheme. That is, the load on the bridge deck of the joint beam of the KS scheme is smaller than that of the DC scheme. (4) on the basis of Chapter 4, the section form of horizontal K brace is analyzed. The influence of key structural design parameters, such as horizontal K brace stiffness and joint beam stiffness, on load transfer of steel truss bridge deck is studied. The results show that T K brace is superior to inverted T shape and cross shape, and at the same time, under the condition that the amount of steel used is not changed, The bridge deck load transmitted directly through the joint beam is positively correlated with the stiffness of the joint beam. Finally, based on the conclusions of the above research, some suggestions are put forward to provide a reference for the development of similar railway steel truss cable-stayed bridges in the future.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27;U441
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