【摘要】 超高韧性水泥基复合材料(简称UHTCC)是具有伪应变硬化特性、在单轴拉伸作用下能够产生多重细密裂缝的新型复合材料,且抗剪性能优越。为考察其在结构抗震中的应用,在节点核心区及附近用UHTCC替代传统混凝土,对9个钢筋混凝土框架节点进行了低周往复加载试验。对节点的荷载-位移滞回曲线、骨架曲线、刚度退化以及能量耗散能力等指标进行了分析与评估。结果表明,UHTCC在梁柱节点处的关键部位代替传统混凝土后能够提高节点的极限承载能力,即使在节点核心区体积配箍率减少一半且梁端箍筋间距增大50%的情况下,试件的刚度退化情况仍然能够优于或与普通混凝土试件相似,且UHTCC试件总的能量耗散与传统混凝土试件相比也有所提高。更多还原

【Abstract】 Ultra high toughness cementious composite (UHTCC) is a kind of new-type composite with pseudo strain hardening property and multi-cracking behavior under uniaxial tension loading, as well as excellent shear resistance. In this research, UHTCC was used in the beam-column connections to examine its seismic resistant performance. Nine specimens were tested under earthquake-type cyclic loading system. The results were analyzed and evaluated concerning the load-displacement hysteresis behavior, spine curve, stiffness degradation and energy dissipation. It is noted that when the conventional concrete was replaced by UHTCC in critical parts of the connections, the ultimate bearing capacity of the beam-column connections was increased. The stiffness degradation of the UHTCC specimens was the same with or even better than the concrete ones, even though the amount of stirrups in the UHTCC specimens were half compared to that in the concrete specimens, and the space between the stirrups at the end of the beams was increased by 50%. Compared to the concrete connections, the higher energy dissipation was obtained in the UHTCC connections.更多还原