Dynamic Behavioral Analysis Of Reinforced Concrete Tied Arch Bridge

Tied arch bridge is a bridge that has the outline of concinnity and is fit for building in the city or on the soft clay ground, which possesses the important status in the domestic and foreign history of bridge building. Its construction method and design theory are already comparatively mature and perfect. But the research of design theory of tied arch bridge trails the engineering practice; especially the study of dynamic performance trails the study of static performance.Because the greatest internal force and displacement of every section when the structure is under the dynamic loads are nearly correlative with the frequencies and the vibrational formats when the structure is under the natural vibration, seeking natural vibration frequencies and modes is the precondition and base to carry through every dynamic analysis. In the thesis, on the basis of existing data collected of arch bridges and dynamics, taking the example of the reinforced concrete tied arch bridge which spans the third loop road in Chengdu, establish 3-D finite element model of it with software ANSYS, and calculate and analyze its natural vibration frequencies. According to the theory analysis of natural vibration feature, the use of natural vibration feature in bridge test is analyzed combined with engineering testing practice. In addition, the stability of the structure are briefly analyzed.As reinforced concrete tied arch bridges develop incessantly, the study on dynamical response of the structure under live loads such as vehicles, wind and earthquake is in need. During the transient dynamic analysis of the reinforced concrete tied arch bridge which spans the third loop road in Chengdu, the time history responses of the structure under uniform velocity moving load and impact load are analyzed, and the amplification coefficients of deflection and internal factors of the structure are intensively analyzed. At last, the responses of the structure under coupling vibration of vehicle/bridge are briefly analyzed.By the finite element simulation to the reinforced concrete tied arch bridge dynamic characteristic, the thesis discusses manifold factors which influence the dynamic characteristic of the reinforced concrete tied arch bridge, and gets some conclusions. It will offer reference to the bridge dynamic test, and provide basic datum for the health examination and maintenance during its use.