摘要
进行了5根钢筋增强PP ECC梁及1根钢筋混凝土梁的滞回性能试验研究,试验的主要参数为纤维掺量,龄期及配筋率。试验表明,PP ECC梁的破坏形态与普通混凝土明显不同,极限状态时,其裂缝宽度控制在0.3mm以内,未出现压碎现象。极限承载力随着配筋率的增加而增加,而延性呈缓慢下降趋势。随着龄期的增长,承载力呈上升趋势,延性有所下降。在试验参数范围内,纤维掺量对其滞回性能影响总体不大。与普通钢筋混凝土相比,其耗能能力为其2.4倍左右。试验结果证实PP ECC对于提高构件或结构的抗震能力有明显效果。
The mechanical property of 5 steel reinforced PP ECC beams and one control R.C beam under reverse cyclic load is investigated and results are presented in this paper. The main parameters of the test are the dosage of fiber,curing age and reinforcement ratio. The results indicate that the damage pattern of PP ECC beam is quite different from the one of common concrete, the maximum crack width of PP ECC beam is below 0.3mm and not crushing of ECC is observedduring the whole loading process. The load bearing capacity increases as the reinforcement ratio and curing age increase, while the ductility decreases. During the test parameters range, the effects of fiber content on the hysteresis property arenot obvious. Compared with the common reinforced concrete, the energy dissipation is 2.4 times higher than the common ones, and the test results verify that PP ECC is helpful to improve the seismic capacity of segments or structure.
出处
《混凝土与水泥制品》
北大核心
2013年第3期34-39,共6页
China Concrete and Cement Products
基金
国家科技支撑计划项目(2012BAJ16B05)
关键词
PPECC
往复加载
滞回性能
刚度退化
耗散能
PP ECC
Cyclic loading
Hysteresis property
Stiffness degradation
Energy dissipation
