配置不同形式500 MPa钢筋的小跨高比连梁的对比试验研究

Experimental Study on Comparison of Small-span-to-depth Coupling Beams with Different Forms of 500 MPa Grade Steel Bars

已有的研究结果表明,配有对角斜筋、综合斜筋的小跨高比剪力墙连梁具有较好的抗震性能。然而使用更高强度钢筋后采用上述配筋方案能否达到预期的效果,缺乏相关的试验研究。为此完成了4根配置500 MPa钢筋的小跨高比连梁在低周反复荷载作用下的试验,研究配置500 MPa钢筋连梁主要受力性能,以及配置500 MPa级钢筋连梁与原有配置HRB335级钢筋连梁在抗震性能方面的差异。8个小跨高比连梁试件试验结果的对比说明,配置500 MPa级钢筋的综合斜筋、对角斜筋小跨高比连梁的钢筋采用等强代换的原则,并与HRB335级钢筋连梁在配箍特征值、剪压比基本相同,构造措施一样的情况下,最终破坏时能达到的最大承载能力差别不大,并表现出良好的抗震性能。

Research results have shown that with diagonal reinforcement and compositive slanting reinforcement ,the coupling beams with small span-depth-ratio exhibited excellent seismic behaviors. However, there is a lack of experimental study whether this two reinforcement schemes can achieve the desired results when they are applied to higher strength rebars. Therefore low cyclic reversed loading experiments are conducted four small-span-to-depth coupling beams with 500 MPa grade rebars. Not only the main mechanical behavior of coupling beams are studied, but also the differences of seismic performance between two coupling beams reinforced with 500 MPa grade rebars and with 335MPa grade rebars are researched. It was verified that there is not much differences between small-span-to-depth coupling beams with 500 MPa grade rebars used equivalent strength substitution principle and with 335MPa grade rebars in the greatest bearing capacity in the final destruction by the experimental results of eight small-span-to-depth coupling beam specimens, When they are in the same case of reinforcement properties of hoop, shear-compression ratio and construction measures. And coupling beams reinforced with 500 MPa grade rebars exhibited excellent seismic behaviors.