Simulation Of Dynamic Construction Process Of Long-span Continuous Rigid Frame Bridge With Asymmetric High Piers

In this paper, long-span continuous rigid frame bridge with asymmetric high piers-a bridge (71m+130m+71m) was be researched, dynamic construction process was be simulated, combined with the structural characteristics of the bridge with asymmetric high piers, degree of influence by force was be studied, the main contents of this thesis are followed:First, the structural characteristics of long-span continuous rigid frame bridge structure and the theory of structural behavious in construction process was be studied, mainly the development and structural characteristics of the long-span continuous rigid frame bridge was concerned, characteristics of bridge construction monitoring, control methods, its work processes, etc.,were used. the the finite element method of construction monitoring was introducted detailedly, and discusses the camber setting method and theoretical calculation.Then, the finite element software CSB and MIDAS-CIVIL were used for simulation of dynamic construction process, displacement, Internal force, stress and deformation map were Calculated in various stages of construction; the comparison of the results from two calculated software show that:the construction of the simulation process, the cantilever bending casting construction value and the deflection of both the variation and data values are basically the same. Before construction simulation, Check the result which provide a strong theoretical basis from two kinds of software CSB and MIDAS.Third, introducting of mechanical characteristics of the structure in the shrinkage and creep, moving load, wind load, temperature load from long-span continuous rigid frame bridge with asymmetric high piers was made, as well as the influence of non-symmetrical height of the pier, the main conclusions are followed:(1) symmetric structure produced symmetrical deformation under the effect of creep and shrinkage, while the non-symmetrical structure will produce non-symmetrical deformation under the effect of creep and shrinkage, the value of the deformation and height of piers is closely,which related with the height of piers. In the wake of increasing of piers, the value of the deformation pier increased,and formed the transition of deflection with the diversification of height of piers between the main non-symmetrical pier. (2) the influence of moving loads and wind loads on the structure are smaller and the demands can be satisfied in the operational phase.(3) the deflection of the bridge will be affected with the diversification of temperature, the higher of pier height, the greater the deflection, and the maximum difference of deflection appeared in the middle of span bridge, while the maximum difference of moment appeared in the top of piers.Finally, the finite element software MIDAS was used for establishing finite element model, considering influence of dynamic characteristics of structure with non-symmetrical hight of piers, we can inclusion:the higher the piers, the lower natural frequency, while the lower height of piers, the higher natural frequency, the natural frequency of long-span continuous rigid frame bridge with asymmetric high piers in between. the internal force and deformation was analyzeed due to asymmetry of hight of piers from long-span continuous rigid frame bridge with asymmetric high piers.the value of internal force on the base of piers of long-span continuous rigid frame bridge with asymmetric high piers is larger than the bridge with symmetric hight of piers along the bridge. The higher piers,the smaller value of Internal force on the base of piers. The hight of piers have an impact on the value of internal force on the base of piers of long-span continuous rigid frame bridge with asymmetric high piers along the transverse direction also. the value of internal force on the base of piers is between high and low symmetric structure, and the value of internal force on the base of piers increased with the increasing of hight of pier.