Road And Bridge Damping Telescopic Device Study

In this paper ,the development of anti-seismic technology of bridge home and aboard and the dynamic force characteristics of the bridge is introduced. According to two stage device that design, damping device used in bridge in the small earthquake different from that strong earthquake . the function of the anti-seismic expansion and contraction installation and the research's importance is mentioned. Two styles of anti-seismic expansion and contraction installation and the detail structure of each is designed. The anti-seismic principle in common use of bridge is mentioned and the principle for calculating the relative displacement of bridges' superstructure under the earthquake is evaluated. The two adjacent structures at the expansion and contraction distance are different intrinsic period and the influence to the relative displacement of the difference is discussed in this paper. A lot of bridge at the n site category is calculated under the 8 degree earthquake, and the program of NBA(The Program of Nonlinear-Seismic Analysis for Beam Bridge) is used to calculate. The simple formula for calculating the superstructure's relative displacement of bridge under the earthquake is evaluated to calculate the superstructure's relative displacement of bridge under the earthquake and select the mode of anti-seismic expansion and contraction installation easily for engineers.