Analysis Of Seismic Response Of Slant-legged Rigid-frame Bridge

On the foundation of summaries of domestic and foreign seismic researches, a dynamic model of slant-leg rigid-frame bridge, which is across Beichen West Road in Beijing Olympic forest park, is built by Midas based on the principle of finite element in this paper. The effects of pile-soil interaction on dynamic characteristics of bridge are analyzed. The natural vibration characteristics of slant-leg rigid-frame bridge are compared with those of simple arched bridge. And the laws are summarized.Based on the modal calculated results, this bridge is analyzed by the method of response spectrum and time-history. The influences of pile-soil interaction, passing-wave effect and vertical shake of ground on bridge seismic response are studied. The issues that should be paid more attention to in the seismic design are also proposed.The weak sections are analyzed in the seismic design. The time-history curves of internal force and response laws are summarized. The seismic response results of bridge are analyzed by comparing the spectrum and time-history response, and analyses of section's intension are also taken into consideration. The conclusions can be a suggestion of seismic design for this bridge, as well as a reference for other similar designs in the future.