Bridge Impact Stiffness Values of Correction in the Earthquake

Generally, the analysis mechanism of collision is based on the contact element method in the colli- sion study of the bridge, which impacting stiffness has been controversial. Currently, it adopted by the col- liding stiffness suggest take 0.5 times short axial stiffness of the beam, which has limitations and department of subjective. In this paper, the author believes that collision stiffness is changing in the collision process ac- cording to collision deformation mechanism on the bridge. Collision stiffness derived by flexibility method and stress strain formula and the change of impact stiffness described by parameters such as stress and strain. Results of analyzing the parameters show that collision stiffness and adjacent beam ratio have a significant affect on the impacting force and duration.