Dynamic response characteristics of the 67-type railway pontoon bridge

Abstract

Abstract In China at present, the 67-type railway pontoon bridge is part of the main reserve standard equipment that can be utilized for traffic emergency of cross-river bridges. Based on the potential flow theory and boundary element method (the three-dimensional source distribution method), this paper studies the dynamic response characteristics of the 67- type railway pontoon bridge under the action of waves and train loads (the live load of the Chinese Standard-18). First of all, the hydrodynamic characteristics based on application of other computation models applied in relation to floating bridges are compared with the results obtained by the present approach. Secondly, the effects of varying the related wave parameters (i.e. wave period and angle of incidence) on the dynamic response of the 67-type emergency railway pontoon bridge (as installed across the Ji Canal within the Beijing-Shanhaiguan line) are investigated. Finally, the load effects in the girder when this bridge is subjected to the action of various wave and train loads are analyzed. The calculation results indicate that the method proposed in this paper has good generality which enables it to perform a better analysis of the hydrodynamic characteristics of this kind of practical emergency pontoon. Article highlights 1. Research on dynamic response for the major railway emergency pontoon in China are carried out; 2. The three-dimensional source distribution method and FEM is adopted; 3. Simulate traffic loads with the live load of the Chinese Standard-18.

Keywords

• 67-type railway pontoon bridge
• Wave and train loads
• hydrodynamic analysis
• 3-D source distribution method
• FEM