Seismic And Wind Response Of Bridges

Under the seismic load and (or) wind load, the vibration of the bridge structure is bringing the fatigue damage to the structure or component easily and cause the pedestrian or vehicle a sense of insecurity or uncomfortable, or even destroyed the bridge completely, causing traffic disruption, so that blocked the relief work, resulting in a greater life and property losses, so that shock (vibration) to expand the extent of harm.This thesis summarizes the forms and the reasons for the failure mechanism and its analysis of a bridge structure, the basic principles and methods of a bridge resisting an earthquake theory and the changes in seismic design method, and analyzed elastoplastic response of the piers of Qi luo gou bridge under strong earthquake excitation(2% exceeding probability), thus obtained the failure process of the piers; the calculation method of the static wind load of a bridge structure which under a static wind load , the judge of wind-induced static instability; the variety forms of the wind-induced vibration of the bridge structure, such as galloping, flutter, buffeting and vortex-induced vibration, including the form of a variety of vibration of the cable on the cable-stayed bridge in the wind and under the combined effect of wind and rain, and expatiate on a variety calculation of vibration corresponding to the wind loads or the calculation of wind loads corresponding the dimensionless parameters; the sensitivity of a variety of bridge-type under the earthquake and wind-induced response and pay attention to the problems in the design;The basic concept and its application in engineering and development prospects of the bridge structure vibration control- passive control, active control, semi-active control and composite control.Finally, we carry on a further discussion of the contents and problems concerning this thesis, and put forward some suggestions and viewpoints.