双层钢桁梁悬索桥疲劳构造细节及补强措施研究

Study on Fatigue Structure Details and Reinforcement Measures of Double-layer Steel Truss Girder Suspension Bridge

为了探明双层钢桁梁悬索桥主桁杆件疲劳构造细节形式及相应的补强措施,文章以某双层悬索桥为工程依托,通过ANSYS Workbench数值模拟出钢桁梁焊接交叉部位过焊孔直角及圆弧构造细节应力曲线,确定出双层钢桁梁悬索桥过焊孔构造应采用直角过渡构造形式;针对构造细节提出疲劳补强措施,确定补强方式,并数值模拟获得了补强后构件的疲劳设计曲线,得到了相应的应力幅为89.66 MPa。结果表明,采用相应补强措施后的主桁杆件疲劳寿命满足设计要求,为桥梁的安全运营提供理论依据和技术支持。

In order to find out the type of fatigue structure details for the main truss bar of double-layer steel truss girder suspension bridge as well as the corresponding reinforcement measures, relying on a double-layer suspension bridge engineering,and through ANSYS Workbench,this article simulated the weld-passing straight angle at steel truss girder weld-crossing places as well as the stress curve of circular structure details, and determined that the double-layer steel truss girder suspension bridge can use the form of straight-angle transition structure ; it proposed the fatigue reinforcement measures regarding the structure details, determined the reinforcement method,then through numerical simulation, it obtained the fatigue design curve of the component after reinforcement, and obtained that the corresponding stress amplitude is 89. 66MPa.The results showed that the fatigue life of main truss bar after the corresponding reinforcement measures can meet the design requirements,thereby providing the theoretical basis and technical support for the safe operation of bridge.