本文对铁路钢桁梁桥杆件自动化设计进行探讨.结合铁路钢桁梁桥系多单元、多工况、多约束的特点,参照现行铁路桥涵设计规范的要求,建立了钢桁梁桥杆件优化的数学模型.着重解决铁路钢桁梁桥重型杆件应力约束显函数表达式;遵循杆件应力约束、几何尺寸约束、刚度约束条件,建立了杆件截面尺寸相互关系式.提出实用而简便的杆件自动化设计方法. In this paper, the automatic design of the railway truss girder bridge member is discussed.Combined with the characteristics of multi-unit, multi-working conditions and multi-constraints of the railway steel truss bridge system, with reference to the current design requirements of the railway bridge and culvert, Optimize the mathematical model.Focus on solving the stress constraint explicit expression of the function of the heavy steel bars of the steel truss girder bridge.Depending on the stress constraints, the geometric constraints and the stiffness constraints of the bars, the cross-sectional dimensions of the bars are established. Rod automation design method.