宜昌长江大桥箱梁横向受力性能研究

宜昌长江铁路大桥为连续刚构柔性拱桥。基于8节点六面体单元与空间梁单元组合计算该桥箱形梁横向受力特性,并采用增设横隔板和横梁的方法,改善结构横向受力性能。研究表明,2种方法均能显著降低箱梁顶、底板横向弯曲正应力。传统平面框架分析法,不能考虑箱梁顶板荷载在桥纵向的传力方式,也不可能计算改善方案的横向应力,应当进行修正。

Study on the Transverse Mechanical Characteristics of Yichang Yangtze River Bridge Box Girder

Yichang Yangtze River railway bridge is a new type hybrid structure of rigid frame aided by steel tube arch. To study on its box-girder transverse mechanical characteristics, a new 3D FEM simulation model, which consists of solid elements, beams and link elements, is built up. Furthermore,two projects were proposed and compared to improve the unfavourable characteristics. The study shows both are effective. Traditional plane frame model, for its great limitation on the longitudinal transfer of load acting on the box girder, cant reflect the advance of improved projects proposed and should be revised during application.