双线铁路简支钢桁梁桥结构受力分析  

Force Analysis of Double-track Railway Simply Supported Steel Truss Bridge Structure

作　　者：张明[1] Zhang Ming(China Railway First Survey and Design Institute Group Co.,Ltd.,Lanzhou 730030,China)

机构地区：[1]中铁第一勘察设计院集团有限公司工程承包公司,甘肃兰州730030

出　　处：《甘肃科学学报》2019年第2期76-80,共5页Journal of Gansu Sciences

摘　　要：为研究双线铁路简支钢桁梁桥结构受力特性,以某双线铁路简支钢桁梁桥钢桁架结构为研究对象,采用有限元分析软件midas Civil 2017建立该桥主桁的三维有限元模型,进行合理的成桥状态计算和不同荷载工况的模拟,完成了该桥的受力分析及新版铁路设计规范所规定的各项检算。该桥的受力分析结果表明,主桁结构下弦杆受拉所产生的轴向应力总是大于上弦杆受压所产生的轴向应力。设计时主桁各杆件应考虑弯曲应力和剪切应力对其选材的影响并采取相应措施增加结构的整体刚度。挠度计算时应考虑其他可能影响结构挠度的因素,并合理布设预拱度。通过各项验算可知,该桥应力、挠度、疲劳强度均能满足相关要求。For the purpose of studying force property of double-track railway simply supported steel truss bridge structure, take a double-track railway simply supported steel truss bridge structure as studied object and use software of finite element analysis, midas Civil 2017, to build three-dimensional finite element model of the main truss and conduct reasonable bridge state calculation and simulation under different load, finally complete its force analysis and checkup stated in new version of railway design specification. The result shows that the axial stress when lower boom in main truss structure is pulled is always bigger than upper boom’s. In design, the effect of bending stress and shear stress of every rod piece on its material in main truss should be thought over and measures be taken to strengthen the integral rigidity of structure. Other factors that affect structure deflection should be thought over and pre-camber is laid out reasonably. By every calculation, the stress, deflection and fatigue strength all meet related requirements.

关 键 词：简支梁 铁路钢桁梁 铁路桥 内力计算 有限元模型 

分 类 号：U24[交通运输工程—道路与铁道工程]