预制混凝土框架中节点抗震性能的试验研究

为了研究一种采用U形钢筋来连接梁柱构件并提供抗弯能力的预制混凝土框架体系的抗震性能.首先在介绍该体系特点的基础上,接着描述了3个梁柱节点的低周反复荷载试验,3个试件的主要区别在于U形钢筋的长度.主要分析了试验中测量的各种钢筋应变.结果表明,U形钢筋的长度对试件的屈服荷载影响不大,且箍筋的屈服荷载比纵筋的要大.试验中柱的钢筋并未屈服,柱仍能承载,满足强柱弱梁的原则.U形钢筋应变显示,钢筋的滑移是从梁柱表面开始,逐渐发展到键槽末端.

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

This paper described 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 were firstly described. Then the cyclic loading tests on three beam-column sub-assemblages were reported. The distinct difference among the three specimens is the length of the U-shaped reinforcing bar. The strains of the reinforcement bars were 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.