一种FRP轻便桥主梁的动力性能研究

FRP材料因其轻质高强、耐腐蚀性能好、抗疲劳性能优异，在工程中的应用前景十分广阔。研究了一种GFRP轻便桥梁主梁的动力性能，建立了主梁的有限元模型并进行了模态分析和时程分析，分析结果表明桥梁在车辆通行时不会发生共振，车速的增加使梁的跨中节点位移增大，因此应对车速加以控制。实桥动载试验验证了计算分析结果的可靠性。

A Theoretical Study of the Dynamic Performance of the Main Girder of an FRP Light Bridge

FRP material has wide application prospects in engineering for it is light in weight, and excellent in both anti-erosion and fatigue-resistant performance. Upon the basis of the study of the dynamic performance of the main girder of a GFRP light bridge, a finite-element model for the main girder established in the paper,with the modality analysis and time history analysis performed. The results of the analyses show that the bridge resonance will not occur when the vehicle accesses it and the increase in the speed of the vehicle will enhance the displacement of the mid-span node of the girder, in which case the speed of the vehicle should be controlled. Practical dynamic loading tests of the bridge are carried out to testify the reliability of the resuits of the analyses.