悬索桥钢桁梁断面质量惯性矩简化计算方法

发布时间：2018-04-26 20:59

  本文选题：钢桁梁 + 悬索桥　； 参考：《湖南大学学报(自然科学版)》2017年03期

【摘要】：鱼骨单主梁模型是分析大跨度钢桁梁悬索桥抗风性能的常用简化模型.针对由于悬索桥钢桁梁断面杆件众多造成的其扭转质量惯性矩计算繁琐、精度低的问题,提出一种基于均匀附加扭转质量惯性矩前后结构扭转频率的变化计算钢桁梁扭转质量惯性矩的方法,并给出了该方法的理论说明、适用条件等.以一钢桁梁悬臂结构为例进行了数值仿真,结果表明:附加扭转质量惯性矩施加在全截面或上、下弦杆节点,且钢桁梁的长细比L/D≥20时,该方法计算的扭转质量惯性矩有较高的精度.采用该方法计算了多座钢桁梁悬索桥的主梁扭转质量惯性矩,比较了全桁架模型和单主梁模型扭转振动频率,验证了方法的有效性.
[Abstract]:The fishbone single beam model is a common simplified model for analyzing the wind resistance of long span steel truss suspension bridges. The calculation of torsional mass moment of inertia is tedious and the precision is low due to the numerous members of steel truss beam section of suspension bridge. A method of calculating torsional mass inertia moment of steel truss beam based on the variation of torsional frequency before and after uniform additional moment of inertia of torsional mass is presented. The theoretical explanation and applicable conditions of this method are given. Taking a steel truss cantilever structure as an example, the numerical simulation results show that the additional torsional mass moment of inertia is applied on the full section or upper section and lower chord joints, and the aspect ratio of the steel truss is L / D 鈮，

本文编号：1807627