文章摘要
朱绩超,贡金鑫,仇建磊,熊亮军,李鑫.不同加载模式下弯剪破坏RC桥墩抗震性能试验研究[J].,2019,59(5):509-517
不同加载模式下弯剪破坏RC桥墩抗震性能试验研究
Experimental study of seismic behavior of flexural-shear failure RC bridge piers under different loading patterns
  
DOI:10.7511/dllgxb201905010
中文关键词: 钢筋混凝土桥墩  标准变幅循环荷载  等幅低周疲劳荷载  累积耗能  疲劳寿命
英文关键词: RC bridge piers  standard variable-amplitude cyclic loading  constant-amplitude low-cycle fatigue loading  cumulative energy dissipation  fatigue life
基金项目:国家自然科学基金资助项目(51678104).
作者单位
朱绩超,贡金鑫,仇建磊,熊亮军,李鑫  
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中文摘要:
      为研究不同地震荷载对钢筋混凝土(RC)桥墩抗震性能的影响规律,采用单调、标准变幅循环和等幅低周疲劳加载对9个轴压比分别为0.05和0.15的RC桥墩进行拟静力试验,考察了不同加载模式下RC桥墩的破坏特征,对比分析了其强度和刚度退化、滞回耗能及残余变形,最后回归了弯剪破坏型RC桥墩低周疲劳寿命与位移角的关系.结果表明:低周疲劳荷载下,随位移幅值的增大,试件残余变形和平均单周耗能均增加,加载循环次数减少且强度和刚度退化严重,在临近破坏时退化最显著;随轴压比的增大,平均单周耗能和累积耗能均增加,但残余变形减小,试件塑性变形能力减弱.单调荷载下试件延性最好,变幅循环和等幅低周疲劳荷载均会削弱试件变形性能,随低周疲劳加载位移角的增加,试件的强度和刚度明显退化,低周疲劳寿命减少.
英文摘要:
      In order to investigate the influence of different earthquake loading patterns on seismic behavior of reinforced concrete (RC) bridge piers, quasi-static test was conducted on nine piers with axial load ratio of 0.05 and 0.15 respectively with loading patterns including monotonic, standard variable-amplitude cyclic and constant-amplitude low-cycle fatigue loading. Failure modes under different loading patterns were investigated. The analysis was done to the strength and stiffness degradation, hysteresis energy dissipation and residual displacement. At last a low-cycle fatigue life expression for flexural-shear failure RC bridge piers based on drift ratio was regressed. It is shown that, under low-cycle fatigue loading, increasing loading amplitude leads to increase of residual displacement and average each-cycle energy dissipation and decrease of loading cycle number, furthermore leads to obvious degradation of the strength and stiffness, especially closed to failure. With the increasing of the axial load ratio, the average each-cycle and cumulative energy dissipation are increased, however, the residual displacement and the plastic deformation capacity are decreased. The ductility is best subjected to monotonic loading and the deformation performances subjected to variable-amplitude cyclic and constant-amplitude low-cycle fatigue loading are negatively influenced. With the drift ratio rise of low-cycle fatigue loading, the strength and rigidity of specimens degrade obviously and the low-cycle fatigue life is decreased.
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