Research On Restraint Influence Of Prestressed Concrete Structures

With the wide application of prestressing force technology in long-span structure and high-rise building structure, how to set up prestressing force effectively and the additional internal force question which is produced in the course of setting up prestressing force need further investigating.The current method of internal force calculation of pre-stressed concrete is based on the principle of pre-stressed continuous concrete beam,but this method does not adapt to the structures of pre-stressed concrete frame,flat plane-beam and so on with peripheral supporting frame which has restrained rigidity.If the structures mentioned above are analyzed by the method,the calculation result and the variation of internal force are not correct and safe and the structures will include incipient fault.Firstly, the pre-stressed concrete beam-slab structure with supporting frame which has restrained rigidity is acted as the research objective.The action mechanism of the structure is analyzed when the beam and slab influence each other.The distribution and the variation of the pre-stressed effective quantities in beam and slab are comprehensively analyzed by the finite element numerical simulation and calculation along with the variation of the restrained rigidity ratio of beam and slab,therefore the effect factors and the specific conclusions of beam on the pre-stressed formation in the pre-stressed conrete slab are drawn.Secondly, the pre-stressed conrete slab-column structure with vertical supporting frame which has restrained rigidity is acted as the research objective.The stress distribution of the structure is analyzed when the column and slab influence each other.The distribution and the variation of the pre-stressed effective quantities in column and slab are comprehensively analyzed completely along with the variation of the restrained rigidity ratio of column and slab. At the same time, the effect factors of column on the pre-stressed formation in the pre-stressed conrete slab are summarized.Finally, the pre-stressed conrete frame with same span and same storey height is acted as the research objective.The action mechanism of the frame beam which is restrained by column is analyzed.The influence of the pre-stressed effective quantities in frame beam is comprehensively analyzed by the finite element numerical simulation and calculation along with the situation of single-spam multi-span and multi-storey pre-stressed concrete frame.Measures to diminish constraint influence are summed up and summarized.