Formulation of design guideline for long-life steel girder bridges

要实现桥梁的长寿命，疲劳问题是重要的问题之一。其次，对三梁式钢筋混凝土板桥进行了大型三维有限元分析，并对次构件的应力进行了研究。有人指出，次要成员的建模需要特别注意。如果钢筋混凝土板有足够的刚度，根据现行规范，梁桥中的大多数加劲构件从疲劳的角度来看是不合理的。尽管不能提出钢桥油漆的替代方案，但高质量的油漆是延长寿命的合理选择。对钢箱梁内部除湿系统进行了试验研究。

To achieve long life bridges, fatigue is one of the important issues. A design guideline to ensure fatigue safety of bridges under vehicle loading was presented.In the next place, large 3D FEM analysis was conducted for 3-girder RC-slab bridge and stress in secondary members was studied. It was pointed out that modeling of the secondary members requires special attention. Provided that the RC slab is stiff enough, most of stiffening members in the girder bridge according to the present code is not justified from a viewpoint of fatigue.Although alternative to painting of steel bridges could not be proposed, it was shown that high quality painting is a rational choice toward long life. Dehumidification system for interior of the steel box girder was experimentally studied.