Study On Self-Centering Mechanism Of Cantilever Beam-Column Connections Of Reinforced Concrete Frame

The traditional building structure had the disadvantage of high repaired cost caused by large residual deformation after an earthquake,so scholars proposed a concept-Earthquake resilient structure.Earthquake resilient structure not only has good seismic performance but also can automatically restore itself through its own recovery mechanism after an earthquake.As one of the Earthquake resilient structures,self-centering prefabricated concrete structure was widely studied by domestic scholars and foreign scholars for its larger self-centering capacity and clearer mechanism which make it easy to be analyzed theoretically.The dissertation proposed a new thought which is improving the self-centering capacity of a connection by lifting the lever of post-tensioned tendons and designed a tendons-touched device to lift the lever of post-tensioned tendons by forcing the tendons to buckle while touching it.A cantilever beam-column connection of self-centering reinforced concrete frame is selected to analysis.In this paper,The uheoretical formula of connections with tendons-touched device or not is respectively derived.The research is focused on the hysteresis curve on Moment-Displacement of connections which is pressured by the road,expound the improvement the tendons-touched device has made to the self-centering capacity of the connection through the comparison of the performance characteristics the curve reflected.According to the result of the theoretical formula,we picked four indicators that incarnate the performance and three basic variables that provide the performance and figured out the requirements on the choosing of the basic variables of the incarnation of performances and brought up the idea of experimental condition for further experiments accordingly.In allusion to the idea mentioned above,we carried out a study on the practicality of the tendons-touched device.Through the analysis of the curve it is concluded that the tendons-touched device has an effect of improving the self-centering capacity of the connections,and the validity of the theory inferred in preliminaries is verified based on the relationship between theoretical result and the curve.Eventually it showed where needs to be adjusted for the formal experiments later according to the detailed flaws reflected in the study on the practicability.