Study On Static And Dynamic Performance Of Simply-Supported Continuous Bridge

With the rapid development of highway construction,the amount of bridges increased substantially.The Simply-Supported Continuous Bridge is widely used in highway construction due to the advantages such as good mechanical properties,being easy to implement the standardize making and the ridingcomfort.When the precast girder is erected in place,the bridge is a statically determinate structure,after the joints are casted , it becomes a statically indeterminate structure.The bearing performance of the structure is one of the focus of engineers and researchers.This thesis is based on the progame The reseach on construction craft and the linear control of the Simply-Supported Continuous Bridge in the highway construction. The author did a number of researches on the static and dynamic analysis of this kind of bridge. Through consulting a large number of domestic and foreign literatures, the author mastered the situation of this topic. As there are a small amount of researches on the finite element analysis of this topic, and based on the summarization of the bridge theoretical analysis, by using the finite element software, this thesis realized the finite element simulation and analyzed the characteristics of the bridge. The main research contents are as follows.1 This thesis discusses the simulation of the beam and summarized the prestressed beam simulation method.On this basis, the mechanical characteristics have been analysised,including the bearing capacity of beams of the girder, stiffness reduction factor and stress redistribution situation of the prestressed steel; And discusses the method of turning the creep problem to an elastic problem on the application of the finite element analysis based on the application of the equivalent modulus method.Which hleps in saving lots of time.2 The space analysis of the Simply-Supported Continuous Bridge includes the construction process simulation and load transverse distribution coefficient.During simulation,the author considered the deformation and internal force of circumstance and introduced the bridge construction process and system transformation theory.As beams have to be transported through bridges in different construction stages, this thesis analyzed the bearing capacity of the naked beams and the load transverse distribution condition of bridge in different horizantal linkage and checked the safety of the unfinished bridge. 3 Vibration and earthquake spectrum analysis of the simply-supported continuous bridge.Mainly discusses the affection of into bridge internal force works on dynamic characteristics of the bridge.Firstly,take the uniform section beam as an example,discussed the influence of the axial and shear force work on dynamic characteristics.Secondly, calculated the model of a 3*30m T-beam bridge in subspace method,got its first 20 vibration frequency and vibration model and analysed the affection of into bridge internal force works on dynamic characteristics of the bridge.