摘要
研究表明:异形柱柱底容易压溃,是异形柱结构的一个薄弱部位。通过反复荷载试验,研究柱底分别采用聚丙烯纤维和钢纤维增强的两组混凝土T形柱的抗震性能,并与无纤维普通混凝土T形柱进行对比,分析不同纤维对T形柱破坏特征、承载能力和位移延性、滞回性能、刚度退化等抗震性能的增强作用。研究表明:加入纤维提高柱的开裂荷载,改善T形柱柱底混凝土剥裂状态,提高异形柱的初始刚度,改善异形柱底薄弱现象。纤维增强后T形柱具有很好的承载能力和延性,综合比较钢纤维增强效果最显著。
It is studied that the base of special-shaped columns is a weak part of the structure because it is easily crushed under compression. Based on the test on two groups of T-shaped columns reinforced by polypropylene and steel fiber separately, and that without reinforcement under cyclic loading, the failure characteristic, the bearing capacity, ductility, the hysteretic properties and rigidity degradation of the two specimens in each group were com- pared to investigate the seismic behavior and the reinforcement to the base of T-shaped columns in this paper. The investigation shows that the adoption of fiber can improve the cracking load, the cracking and spalling for concrete in the base of columns are improved dramatically, the initial rigidity of the special-shaped columns is enhanced, the weak part in the base of special-shaped columns is improved. The T-shaped columns reinforced by fiber exhibit good bearing capacity and ductility. In general comparison, the reinforcing effect of steel fiber reinforcement is more significant than that of polypropylene fiber.
出处
《世界地震工程》
CSCD
北大核心
2015年第4期1-6,共6页
World Earthquake Engineering
基金
国家自然科学基金(异形柱结构倒塌机制与防控关键技术研究)(51178304)
高等学校博士学科点专项科研基金(斜筋异形柱节点抗剪机理研究及其精细化分析)(20120032120055)
关键词
T形柱
纤维
增强
延性
抗震性能
T-shaped column
fiber
reinforcement
ductility
seismic behavior
