反复荷载作用下纤维增强异形柱的抗震性能试验
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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.
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.
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.
引文
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[9]刁波,李淑春,叶英华.往复荷载作用下混凝土异形柱结构累积损伤分析及试验研究[J].建筑结构学报,2008,29(1)5:7-63.Diao Bo,Li Shuchun,Ye Yinghua.Analysis and experi-ment of cumulated damage of RC structures with special columns under cyclic loading[J].Journal of Building Structures,2008,29(1)5:7-63(in Chinese).
[2]Thomas Hsu Cheng-Tzu.Biaxially loaded L-shaped rein-forced concrete columns[J].Journal of Structural Engi-neering,1985,111(12)2:576-2595.
[3]Thomas Hsu Cheng-Tzu.T-shaped reinforced concrete members under biaxial bending and axial compres-sion[J].ACI Structural Journal1,9898,6(4):460-468.
[4]王铁成,张学辉,康谷贻.两种混凝土异形柱框架抗震性能试验对比[J].天津大学学报,2007,40(7):791-798.Wang Tiecheng,Zhang Xuehui,Kang Guyi.Experimental comparison of seismic behavior of two RC frames with specially shaped columns[J].Journal of Tianjin Univer-sity,2007,40(7)7:91-798(in Chinese).
[5]王铁成,林海,康谷贻,等.钢筋混凝土异形柱框架试验及静力弹塑性分析[J].天津大学学报,2006,39(12):1457-1464.Wang Tiecheng,Lin Hai,Kang Guyi,et al.Experiment and nonlinear static analysis of RC special shaped col-umn frames[J].Journal of Tianjin University,2006,39(12)1:457-1464(in Chinese).
[6]孙海燕,龚爱民,彭玉林.聚丙烯纤维混凝土性能试验研究[J].云南农业大学学报2,0072,2(1):155-158.Sun Haiyan,Gong Aimin,Peng Yulin.The experimental study of polypropylene fiber concrete performance[J].Journal of Yunan Agricultural University,2007,22(1):155-158(in Chinese).
[7]钱庆祎,张经双.纤维混凝土特性研究及应用前景[J].西部探矿工程2,0051,14(10):166-168.Qian Qingwei,Zhang Jingshuang.Research on properties and application prospects of fiber concrete[J].West-China Exploration Engineering,2005,114(10)1:66-168(in Chinese).
[8]王东升,冯启民,王国新.考虑低周疲劳寿命的改进Park-Ang地震损伤模型[J].土木工程学报,2004,37(11)4:1-49.Wang Dongsheng,Feng Qimin,Wang Guoxin.A modi-fied Park-Ang seismic damage model considering low-cycle fatigue life[J].Journal of China Civil Engineering,2004,37(11):41-49(in Chinese).
[9]刁波,李淑春,叶英华.往复荷载作用下混凝土异形柱结构累积损伤分析及试验研究[J].建筑结构学报,2008,29(1)5:7-63.Diao Bo,Li Shuchun,Ye Yinghua.Analysis and experi-ment of cumulated damage of RC structures with special columns under cyclic loading[J].Journal of Building Structures,2008,29(1)5:7-63(in Chinese).
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