Structure Performance Analysis Base On Segmentation Tensioned Prestressed Long-Span Continuous Beam

The aiming at Chongqing Jiangbei Airport Terminal T3 a floor long large span with bonded prestressed continuous prestressed concrete beam deepen design part, through the analysis of the general structure layout, structure and construction characteristics, theoretical derivation and finite element simulation, a combination of research methods, for this type of structure arrangement method and the structure of rationality, mechanical calculation model is improved, the way of construction for the nodes should influence characteristics, single beam bearing forces influence degree were studied. The main results are as follows:(1)In view of the shortcomings of the existing post cast strip prestressed continuous beam structure, the overall arrangement of the long span prestressed concrete continuous beam structure with bond length is presented;(2)The concrete structure in the overall arrangement of the long span prestressed concrete continuous beams based on the sectional tension. Through the partial link analysis, model analysis of post pouring belt in conventional reinforced the reasonable cut-off mode that reinforced focus hard deviate from the centroid and for post cast band spacing, prestressing tendon segment layout and beam arrangement type equation, prestressed reinforcement lap length value present value method; needle of haunched tensioning end damage characteristics of proposed structure to strengthen reinforced configuration method and on the allocation of the number of recommendations.(3)Based on prestress equivalent load principle is derived under several commonly used prestressed tendons linear equivalent load and in the case of side beam haunch prestressed beam proposed variable stiffness beam calculation model, and by force method to calculate the uniformly distributed load under the action of side beam of rectangular haunched beam internal force;(4)Using finite element software ABAQUS modeling and computing, for beam and side beam of rectangular haunched structures on slotting method of beam column joints should be force to compare the node x to stress, y to stress, frame beam mid span displacement;(5)Using finite element software to build three groups of simply supported prestressed concrete beam. By controlling the lap length of prestressing tendons, loading displacement method by three groups of force displacement curve, reach a certain length of lap length of prestressed tendons from bearing force can not only significantly reduce the conclusion and verify the piecewise tensioning structure layout is reasonable.