Dynamic Feature Analysis And Seismic Response Control Of Single Pylon Self-anchored Suspension Bridge

Self-anchored suspension bridge is widely used in Chinese City bridge engineeringin recent years. The first one of this type bridge was constructed in2000in Chinamainland. In the following ten or more years, there are at least thirty self-anchoredsuspension bridges which are finished in China. Because of its’ esthetics performanceand good mechanics behavior, Self-anchored suspension bridge has become newfavorite structure for bridge design engineer. However, there are few researches aimedat dynamic feature analysis and seismic response control. Besides, in these seismicallyactive days, few references on seismic design of self-anchored suspension bridge areoffered for bridge design engineers. Consequently, researches relevant to the issuespresented above are particularly urgent and of great importance.In this dissertation, exhaustive research on dynamic feature analysis and seismicresponse control is conducted via general finite element software, Sap2000, and basedon the object-a landscape bridge crossing the Hunhe River in Shenyang City. First, arational shape function is well chosen and formulae for the free vibration ofself-anchored suspension bridge are put forward to calculate the fundamental frequencyof the longitudinal and vertical mode. Compared the results from the formulae to thoseachieved via analysis on Sap2000software, the formulae are proved to be right. Second,inputting the response spectrum designed on the basis of seismic specification andartificial earthquake wave to the analytical model, seismic response of the self-anchoredsuspension bridge can be gained. Third, the Moment-Curvature curve for differentcontrol sections are simulated to calculate the equivalent yield moment of these sectionsand check the ductility capacity of the bridge. Lastly, according to the analysisdescribed above, Viscous Dampers and Tuned Mass Damper (TMD) are applied into thedifferent analytical models respectively to carry out seismic control in longitudinal andtransverse direction of the bridge. Meanwhile, parameters optimization of the ViscousDampers and TMD are performed to gain the best effect of seismic control.