Part Of The Calculation Of Prestressed Concrete Frame Beam Design And Construction Inspection Of Certain Issues

In this thesis, it is analyzed theoretically the steel bar layout pattern, the prestress loss, the concrete stress, and the discipline of the deformation and the fracture forming of structures of the partial prestress concrete frame beams, which is widely used in modern civil engineering. The general formulation of prestress anchoring loss and the long-tern flexure deformation calculating of beams is deduced.In the light of the deficiency of the routine calculating method in the application of multi-curve style prestress steel bar in the large span structures, an applied program is written to calculate the loss of the prestress. FEM is used to calculating the concrete stress of the frame beam under prestress load, in the process of which, many successful improvements have been made in the element division, load application and the treatment of the support restraint.Based on the engineering requirement, much application technological research has done on the compression of frame beams, concrete stress, anchoring loss, hole friction loss and the measuring of the inverted arch. And some useful suggestion has been tendered to improve the calculating and design method and optimize the construction.