斜拉桥波形钢腹板箱梁的力学特性研究

研究了斜拉桥中波形钢腹板箱梁在成桥状态下的力学特性。以新密市溱水路波形钢腹板箱梁斜拉桥为工程实例,通过有限元计算与分析得到主梁的竖向位移、波形钢腹板的剪应力、混凝土板的正应力和竖向挠度、主梁的纵向正应变、混凝土板的应力传递等各项力学规律。结果表明,波形钢腹板的竖向剪应力沿梁高方向近似均匀分布;波形钢腹板的竖向变形在整个主梁的竖向变形中起主要作用;波形钢腹板的纵向正应变小于混凝土板;按波形钢腹板承担全部剪力的传统理论进行结构设计偏于保守。

Study on Mechanical Behavior of Box Girder with Corrugated Steel Webs of Cable Stayed Bridge

Mechanical behavior of box girder with corrugated steel webs under completion state of bridge is studied. Based on the engineering example of the cable stayed bridge of box girder with corrugated steel webs on Zhenshui Road in Xinmi City, finite element method （FEM） was applied to calculate and analyze vertical displacement of box girder, shearing stress of corrugated steel webs, normal stress and vertical deflection of concrete plate, longitudinal strain of box girder and stress transmission of concrete plate. The results show that vertical shearing stress of corrugated steel webs is approximately uni- formly distributed along the height of box girder. Vertical deformation of corrugated steel webs plays a dominant role in the deformation of box girder. Longitudinal strain of corrugated steel webs is smaller than that of the concrete plate. Structural design based on traditional theory that corrugated steel webs bear all the shear force is conservative.