Numerical Analysis For Dynamic Response Of Bridge Under Moving Loads

The vibration of bridge construction is a periodic process that the transforming energy of construction system and the exercise energy convert mutually. It accompany with the outside function input (the vehicle load, the forcee of wind, the earthquake wave) and the friction to exhaust (the material inside friction, the link friction and the friction of support). The vibration of bridge construction is one of the important factors which affect the usage and safeties of bridge. Today, with the high-speed development of society, the forms of bridge construction gradually become lighter and larger. So the construction vibration of the large-span bridge under the ambulation load became a problem which is wide-spread concerned.The bridge is the most common type in the highway bridge engineering, simultaneity, it is the foundation for analysis other ones. In this paper, the beam bridge is regarding as the object structure, the beam bridge dynamic analysis theory has been deduced in detail. And with the fmite element method, the dynamic analysis methods of common structure has been established, and they are solved using Wilson-θand Newmark method. Moreover the idiographic expressions of stiffness matrix, mass matrix and damping matrix for various cross section has been deducted. This algorithm can be used for dynamic response analysis of bridge with various types. According to the algorithm, the calculate programme have been worked out with the Fortran language.With various models of bridges (the simple supported beam, the continuous beam, the elastic supported beam), various models of moving loads (the uniform force, the Harmonic force, the lists of forces) and various speed of moving loads (uniform speed, nonuniform speed, chase speed), the dynamic response of bridges are evaluated and compared with other cases roundly. Through many example examination, this conclusion has been gotten that the programme used in this text is right on the calculate way, and the calculation result is dependable, the procedure has practical worth in the engineering.