Experimental Study on Seismic Behavior of Interior Joints of Precast Prestressed Concrete Frames

Abstract eng:
This paper describes a precast concrete framing system, in which the U-shaped reinforcing bar is used to provide the flexural resistance between prestressed beams and columns. The characteristics of this system are firstly described. Then the cyclic loading tests on three beam-column sub-assemblages are reported. The distinct difference among the three specimens is the length of the U-shaped reinforcing bar. The strains of the reinforcement bars are mainly discussed in this paper. The results show that the yield loads of specimens have small relation to the length of the U-shaped reinforcing bar, and the yield loads of the stirrups are larger than longitudinal reinforcement bars. The reinforcement bars of the column are not yield during the test, so the column works well. This meets the requirement of strong column and weak beam. The strains of the U-shaped reinforcing bars indicate the slip of the bar is from the beam-column interface to the end of the service hole, and it corresponds with the theoretical analysis.

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