刚架拱桥横梁加固研究

摘要

This paper establishes spatial finite element model of rigid-frame arch bridge,analyzes impacts of increasing cross-beam section at different parts upon structural static and dynamic,seeks effective reinforcing position,and finds out that increasing crossbeam section at different position will change the internal force of critical parts,and then shows that increasing crossbeam section will change the section stress and increase other section stress as well,which should be emphasized.Increasing chord crossbeam section and arch crossbeam section can increase basic structural frequency and high frequency.%建立刚架拱桥空间有限元模型,分析了增大不同位置横梁截面对结构静力和动力性能的影响,寻找最有效的加固位置,得出了不同位置横梁增大截面对结构各关键部位的内力改变,表明增加横梁截面在改善某个截面受力的同时可能加大其他截面的受力,应该予以重视。增大弦杆横梁截面和增大拱腿横梁截面对结构基频及高阶频率均有所提高。