Study On Beam Falling Proof Reinforcement Technology For Beam Bridge

The unseating of bridge superstructure is severe earthquake damage during strong earthquakes at home and abroad.In the high intensity seismic region – Southwest China,mostly in the mountains,these beam bridges accounted for a large proportion.From the major earthquakes of recent years,it’s obvious that the girder bridge is prone to falling beam.The beam falling is difficult to repair,and even worse,the bridge in the mountains is often the throat of land transportation,once it is damaged,that will cut off traffic directly and hamper disaster relief seriously.The study on collapse-proof is not enough intensive and comprehensive,and there is no the specifications about beam falling.In this paper,collapse-proof reinforcement technology for beam bridge is researched and recommendations on engineering applications is made,the main contents are as follows:1.The background and significance of the study is introduced,and the beam falling proof specifications and research status are discussed.2.A multi-span girders bridge is used as a sample,and the analysis model is built.Three earthquake time history records with different spectral characteristics are used in the response analysis of the girder bridge with-the peak acceleration values adjusted,so that beam falling occurr.3.The effects of three beam falling proof technology(cable connection between the beams;cable connection between the piers and the beam;changed to continuous beam bridge)are studied and compared by the seismic response analysis.4.Parameter studies of the cable connection between the piers and the beam technology is conducted,and the influence of cable length,initial gap and cross section area of cable are analyzed.The technology of cable connection between the piers and the beam of the continuous beam bridge is studied preliminarily.