Research On Seismic Behavior Of Pre-stressed Fabricated Concrete Frame Joints

Pre-stressed fabricated concrete frame is assembled by pre-cast pres-stressed beams and columns with tendons in the joints of the frames. These beams and columns are hoisted in sit and the tendons are passed through the moirépips. So pre-stressing force is brought to the joints of the frame. These tendons also can assume the moments at the end of the beams in ordinary condition. By way of these tendons, pre-cast beams and columns can be assembled conveniently, and the joints and frames are monolithic and continuous. Consequently, compared with common reinforced concrete frames, this kind of frame systems possess higher reliability and solved the problems in the process of assembling Pre-stressed Concrete frames. Pre-stressed fabricated concrete frame explores a new way for industrial production of pre-stressed structures.A two-storey and double-span pre-stressed fabricated concrete frame was tested under reverse cyclic loading in this paper. The crack distribution and damage map and the hysteresis curves of displacement-shear angle and load-shear angle of the core area of joints were obtained. The authors figure out the stress distribution and shear deformation of the frame joints, discussed mechanism of shear transferring of joints, analyzed the anti-cracking capacity of the core area of joints and derived the anti-cracking formula and shear deformation formula of the pre-stressed prefabricated concrete frame joints at last. Finally, the author used the finite element software project to simulate the experiment. The results indicated that the core area of pre-stressed fabricated concrete frame joints in the in the state of bi-directional compression showed excellent anti-cracking capacity and seismic performance.