The Research Of Semi-rigidity Connection Of Assembled Prestressed Concrete Frame Structure

The semi-rigidity of connections is an inevitable problem in the design of prefabricated structure. At present, the research of semi-rigid structure of the assembled structure is concentrated on the steel structure. The research of semi-rigidity of connections mainly focuses on two aspects:when we need to take the semi-rigidity into consideration, which needs us to classify the connections, and get the semi-rigid interval of the connections; how to consider the semi-rigid nodes. In this paper, taking the prestressed concrete structure assembly as research object, we dedicate to study the semi-rigidity of the prestressed concrete structure assembly, the research includes the following several aspects:1.The relative rotational stiffness and the stiffness ratio of connections were used to reflect the influence of semi-rigidity on prefabricated structure; By treating the semi-rigid unit as a basic unit of structural mechanics, the expression of the structure with different mechanical parameters was deduced; The stiffness ratio of connections was used to classify the connections and the semi-rigid interval of the connections was got;2.The effects that the semi-rigidity of connections have on the static and dynamic response of structure were studied. It indicated that the lineal stiffness ratio of beam and column has an effect on the impact that the semi-rigidity of connections have on structure, when the lineal stiffness ratio of beam and column increased, the semi-rigid interval of the structure would reduce; and compared with the structure with static load, the structure under dynamic action had a wider semi-rigid interval;3. At first the expressions of the relative rotation stiffness and relative stiffness ratio of the joints of the prestressed concrete structure were deduced. Then by the finite element method, a variety of facts that can affect the semi-rigidity of the prestressed concrete structure were analysed, which contact the changes of the beam and column section size, length of beam, height of column, the reinforcement ratio of the beam and column and the prestress;4.By considering the semi-rigidity of the joints of the prestressed assembed concrete frame structure, an experimental case of prestressed assembed concrete frame structure was calculated. It suggested that the and displacement of the prestressed concrete structure assembly could be calculated by treating the prestressed assembed concrete frame structure as semi-rigid structure, and the internal force didn’t need to redistributed. And the reasonableness of the method was verified by the instances.