| Popis: |
With the rapid development of the economy, , bridge construction, as one of the elements of modern traffic engineering often becomes the key part which restricts the whole construction. The external pre-stressing technique of precast segmental construction gets more and more attention in modern bridge construction because of its unique advantage. However, as a special structure of precast segmental construction, the joint’s strength and connection reliability is closely related to stress and service performance of the pre-spliced structure. So it is necessary to analyze the structure and mechanical properties of the joint. For the research of the joint in precast segmental construction applied in externally pre-stressed concrete bridges, this paper introduces the types and characteristics of joint structure, and uses the similar sectional analysis method of internal pre-stressing structure to analyze the bending performance and shear performance in a cross-section of a joint. At the same time, on the basis of the consideration of the secondary effect of external pre-stressing, some kinds of common calculation formulas used for bearing capacity calculation in the cross-section of the joints are given. Finally, results of numerical simulation analysis by the finite element program ANSYS and some experimental study from both at home and abroad prove the rationality of these formulas. |
