Spatial Mechanic Analysis And Construction Monitoring Study For The Steel-Concrete Composite Multi-Girder Bridge

The steel-concrete composite multi-girde bridge is widely and increasingly applied for some merits, such as light weight better economical efficiency and constructsconvenience. However, there is less study on spatial mechanic and construction control for the steel-concrete composite multi-girder bridge.To solve problems of the theories and technologies of study on spatial mechanic and construction control for the steel-concrete composite multi-girder Bridge,this paper has completed the following research work with the real situation of the steel-concrete composite multi-girde bridge of the second phase of qiu shi freeways project.First of all, we studied the spatial mechanical characteristics of the steel-concrete composite multi-girder bridge by the finite element model of the girder and the 3D simulation. Based on the calculated results of the finite element model, feasibility and accuracy of the space theory practical method have been studied mainly.It includes the comparative study on the calculated results of the finite element model and the space theory practical method, influences of width/span ratio and number of diaphragm on accuracy of the space theory practical method.Then, based on the finite element model of 3D simulation about the steel-concrete composite multi-girder bridge of qiu shi freeways project, study on the temperature effect in construction when temperarure difference is linear across the cross-section and influence on deformation,stress,stability under several ultimate temperature load conditions has been done.This chapter also analysed the temperature effect in application when temperarure difference is linear across the cross-section under several conditions and influences on deformation,stress for bridge structure.Under dead load and Moving Vehicle, shear lag effect and coefficient of Shear lag have been studied mainly when the steel-concrete composite girder bridge of the second phase of qiu shi freeways project has been in application.Finally, spatial mechanic analysis and re-check of bridge structure about the steel-concrete composite girde bridge of the second phase of qiu shi freeways project has been done. And then, this chapter has investigated the Critical technique of construction monitoring andbring out Scenario.By above studies,this paper obtain some valuable conclusions which can provide consult and reference in consummating the theory of design and construction monitoring of the steel-concrete composite multi-girde bridge.