Research On The Dynamic Performance Of The Long Span Self-Anchored Suspension Bridge With Composite Girder

The world has entered a new period of seismic activity, Several major earthquakeshad occurred in the first decade of the new century, caused huge losses to people's lifeand property. Bridge as a transportation lifeline, importance is self-evident, play an irre-placeable role during the earthquake relief. With the accelerated process of urbanization,the population is increasingly intensive, also more dependent on tra?c, the self-anchoredsuspension bridge as a common city bridge, due to its own advantage, favored by the en-gineering sector, has a wide range of applications; At present the dynamic performance ofthis kind of bridge not systematic, especially composite girder self-anchored suspensionbridge, therefore, to carry out the Dynamic behaviors Seismic response behavior of thebridge-type has important theoretical and engineering significance.In this paper, use a in the construction of the self-anchored suspension bridge withcomposite girder for engineering objects,the structure had was simplified reasonablely,retain key elements, ignoring the minor components,builds up an integrated finite elementmodel of the whole bridge by using ANSYS, carried out a detailed structural seismicanalysis, do work mainly as follows:1.Discusses the advantages and disadvantages of self-anchored suspension bridgeand the development , builds up an integrated finite element model of the whole bridge,determine a reasonable bridge completion, subsequent analysis is based on the model.2.Discusses the three main methods for solving the characteristic value, use sub-space iteration method for solving the vibration characteristics of the structure, extractthe first 20 natural frequeneies and its according mode shape were obtained, discuss thedistribution of frequency.3. According to site conditions, using the rules and regulations of the accelerationresponse spectrum, using a two-level design, the structure was respectively analys bymeans of E1 and E2 earthquake e?ect, And consider the space incentives, identify themost adverse load case and the most disadvantaged sections under the type of bridgeseismic work .4.Discusses the stochastic simulation method of ground motion, artificial seismicwave theory and its synthetic method , the preparation of artificial seismic waves usingMATLAB program, Use standard given power spectrum synthesis and acceleration re-sponse spectrum adaptation of the artificial seismic waves, And use of artificial seismic waves on the structure of the seismic time-history analysis, and the stochastic simulationmethod ; Given the bridge of the general rule of vibration.