重载铁路部分斜拉桥结构参数分析  

Structure Parameter Analysis of Partially Cable-stayed Bridge on Heavy Haul Railway

作　　者：李桂林[1] LI Gui-lin(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道标准设计》2018年第6期51-55,共5页Railway Standard Design

基　　金：中国铁路总公司科技研究开发计划课题(2016G002-I);中铁第四勘察设计院集团有限公司科技研究开发计划项目(2014K21)

摘　　要：以蒙华重载铁路主跨248 m部分斜拉桥为例,采用有限元分析理论,分析在该跨度范围内部分斜拉桥应用于重载铁路的适应性及特殊性。对该桥结构体系、主梁梁高、预应力次内力、桥塔刚度、桥塔高度及索塔梁刚度匹配等结构参数进行比选研究,确定合理布置形式。结果表明:(1)该重载铁路部分斜拉桥采用塔梁固结、墩梁分离体系,主墩支座采用双1 90 000 kN超大吨位球形钢支座;(2)主梁中支点—跨中梁高采用13 m-6 m组合为优;(3)短预应力钢束时弯矩近似矩形分布于预应力钢束布置区域,次内力较小;长预应力钢束次内力弯矩近似呈三角形分布,次内力影响明显;(4)桥塔尺寸主要由索鞍等构造及桥塔本身受力控制,其刚度对结构整体受力及刚度影响均较小;(5)为提高跨中截面等控制性区域结构受力性能,桥塔采用高塔型体系,高跨比1/4.35;(6)结构整体刚度主要由主梁提供约占67%,主塔及拉索对整体刚度贡献值为33%,主塔及拉索对刚度影响因素主要为桥塔高度。The 248 m main span cable-stayed bridge on heavy haul railway is used for case study. The finite element analysis theory is adopted to analyze the adaptability and particularity of the cable-stayedBridge within this span range. Structure parameters, beam ＇s depth and extra-internal force due to pre-stressing, stiffness of tower,bridge tower height and stiffness matching arestudied in detail. The results show that（ 1） the cable-stayed bridge of this heavy haul railway uses the consolidation system of the tower girder and the separation system of pier beam,and the main pier is supported by the double 190 000 kN supersized spherical steel bearing;（ 2） the combination of 13 m-6 m is used for the optimal cross – span of the depth of beam;（ 3） in the short prestressed steel beam,the bending moment approximates the rectangular distribution,mainly for the prestressed steel bundle layout area,and the extra-internal force is small; the internal force bending moment of long prestressed steel girth is approximately triangular distribution,and its influence is obvious;（ 4） the size of the bridge tower is mainly controlled by the structure of the size of the cable saddle and the bridge tower itself,and its stiffness has little effect on the overall force and stiffness of the structure;（ 5） in order to improve the stress performance of the control area such as cross-section,the bridge tower adopts the high tower system,which is higher than 1/4. 35;（ 6） the overall stiffness is mainly composed of main girder accounting for about 67%,the main tower and cable contributing 33% to the overall stiffness,which is mainly offered by the bridge tower height.

关 键 词：部分斜拉桥 重载铁路 约束体系 大吨位支座 次内力 桥塔刚度 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]