| With large concentration of population in modern city and rapid economic development, traffic lines played a more and more important part in present society. Therefore, once the traffic lines were damaged by the earthquake, more and more losses of life and property and economy were caused. Several large earthquakes occurred in recent years showed the serious consequences of destruction of bridge engineering, furthermore, they showed the importance of seismic analysis of bridge engineering as well. The research indicates that improving the seismic performance of bridge is one of basic measures of reducing earthquake losses and enhancing regional security.There are three kinds of method in seismic design of bridge:static method, response spectrum method and dynamic time history analysis. The proper method should be chosen according to structure form of the bridges and the requirements in different design phase.Based on the seismic design of NanChong XiaoLongMen JiaLing river grand bridge, the basic theory of seismic response analysis was described briefly. Two spatial models of continuous beam and continuous beam arch combination were built in ANSYS. The free vibration characteristics analysis was made by Lanczos method. The pile-soil interaction was considered by Penzien model and M-method, and the effect of the pile-soil interaction on the free vibration characteristics was analyzed as well. The basic theory of response spectrum method was introduced, and this method was applied to the two models. The maximum earthquake loads were obtained by CQC modal combination method to check the strength and deformation of control section in the bridge, and response values of two models were compared and analyzed. Besides, the basic theory of dynamic time history analysis method was introduced, and two models were also calculated by this method. The response of internal force and displacement of key sections in the bridge under dynamic loads were compared and analyzed.
|
PDF Full Text Request