中文摘要：

异形柱柱底容易压溃是异形柱结构的一个薄弱部位.通过有无纤维的2组混凝土异形柱在反复荷载作用下的试验,对比分析2组异形柱的破坏特征、承载能力和位移延性、滞回性能、刚度退化、耗能能力以及累积损伤等,研究纤维对异形柱抗震性能和柱底的增强作用.研究表明：加入纤维可以推迟开裂,显著改善异形柱柱底混凝土剥裂状态,提高异形柱的初始刚度,减轻异形柱累积损伤,改善异形柱底薄弱现象.纤维增强异形柱具有很好的位移延性,使承载能力有一定提高,但其耗能能力略有降低.

英文摘要：

The base of the special-shaped columns is the weakness site of this structure because it crushes easily under compression.Based on the tests on two groups of special-shaped columns with or without reinforcement by fiber under cyclic loading,the failure characteristic,bearing capacity and ductility,hysteretic properties,rigidity degradation,energy dissipation,and cumulated damage of the two specimens in each group were compared to investigate the seismic behavior and the reinforcement to the base of special-shaped columns in this paper.The investigation shows that with the adoption of fiber,the cracking is delayed,the cracking and spalling for concrete in the base of columns is improved dramatically,the initial rigidity of the special-shaped columns is enhanced,the degree of cumulated damage is lightened,and the weak part in the base of special-shaped columns is improved.The special-shaped columns reinforced by fiber also exhibit good displacement ductility and better bearing capacity but less energy dissipation capacity.