Study On Several Problems Of Aseismic Design For Precast Prestressed Concrete Frames

The precast concrete structure, one of the important structures for the realization of architecture industrialization, has a good momentum of development. Precast prestressed concrete frame systems discussed in this dissertation, in which precast beams and columns are connected by post- tensioned tendons, have not only the common advantages of all precast concrete structures, but also many merits of itself, such as making"beam-hinge mechanism"easy to realize, enhancing durability of structures, protecting joint from severe damage, easy to evaluate seismic loss, etc. Study on its aseismic design approach has significant application value for application of this kind of frame.The job performed in this paper is chiefly aimed at bonded precast prestressed concrete frame, and the main content of this paper is briefly summarized as follows:(1) Test on aseismic performance of interior joint of bonded precast prestressed concrete frame was carried out. The aim of the test,design process of the test members as well as the loading condition was introduced. The test phenomenon, hysteresis hoops, stiffness deterioration condition, as well as ductility and energy dissipating capacity was analyzed. The test result indicated that the energy dissipation capability is relatively poor than that of the cast- in- place concrete frame, and the residual deformation is small. The ductility of this frame is acceptable, and damage is concentrated on the beam-to-column interface and the corbel, while the members as well as the joints will suffere only minor damaged.(2) Story drift angle of a precast prestressed concrete frame mainly consists of four parts: rotation of the beam-column connections, bending of the beams, bending of the columns, and shear deformation of the beam- column joint. The whole-progress theoretical analysis was performed, the accuracy of which was confirmed by comparison to test results. By computing the contribution of each part to the story drift angle, the conclusion was acquired that rotation of the beam- column connection is the main constituent of the story drift angle when the story drift angle becomes large.(3) The influence factors of the joint crack resistance and existing computing formulas were generalized, the difference between shear transform mechanisms of bonded and partially dedonded prestressed concrete frame joint was analyzed. The joint crack resistant capacity formula was deduced at the view of anti-crack capacity, which is uniform with the existing application counterpart. Accuracy of the formula was verified by test results. The joint shear mechanism was discussed, and then propositional calculation procedure of shear strength was presented referring to the existing methods.(4) The computing formula of bend and crack resistant capacity was deduced. The shear mechanism of notch beam and corbel as well as shear resistant capacity provided by press frication action was analyzed, thus concluded that shear resistant capacity provided by press...