【作者】 刘飞；

【导师】 汪梦甫；

【作者基本信息】 湖南大学 ， 结构工程， 2014， 硕士

【摘要】 本文对高轴压作用下配置加密箍筋的RC框架柱展开试验研究，考察箍筋加密布置的混凝土柱的抗震性能。通过对2根配置加密箍筋的RC框架柱和1根对比柱进行低周反复加载试验，研究高轴压比下箍筋加密的RC框架柱的抗震性能。试验以箍筋加密方式为主要参数，研究在高轴压比下RC框架柱的抗震性能的变化规律。通过对试件的破坏形态、滞回特性、骨架曲线、延性、刚度退化和耗能能力等重要抗震性能指标的综合分析，得出以下结论：（1）配置加密箍筋能有效提高高轴压比下RC框架柱的抗震性能（2）配置加密箍筋可以在一定程度上改善RC框架柱的破坏模式，加密箍筋使混凝土处于三向受压状态，可对试件斜裂缝的产生和发展起一定的抑制作用。（3）配置加密箍筋基本不会改变RC框架柱的初始刚度，而且水平承载力有一定程度的提高，延性有较大程度改善。（4）配置加密箍筋能较好的改善RC框架柱的刚度退化现象，使结构柱在水平位移较大的情况下仍能保持比较稳定的承载力。（5）配置加密箍筋的RC框架柱的耗能能力明显高于未加密箍筋的对比柱运用有限元软件MSC.marc，建立了合理的有限元模型，对本文试验研究的试件进行了比较准确的数值模拟。通过对比计算结果和试验结果可知，计算所得的滞回曲线和骨架曲线均与试验结果吻合较好。在验证有限元模型合理的基础上，进一步探讨了更高轴压比下配置加密箍筋的RC框架柱的抗震性能，随着轴压比的增大柱抗震性能变差，延性下降。更多还原

【Abstract】 Seismic performance of reinforced concrete frame columns with dense stirrupsand high axial compression ratio is investigated experimentally in the thesis.Two columns with dense stirrups and one contrastive column are tested underlow cyclic loading with high axial compression ratio to investigate the columns’seismic behavior. The main test parameter is the pattern of stirrup densification. Theprimary seismic performance indexes including failure mode,hystereticcharacteristics,skeleton curve,ductility,stiffness degradation and energy dissipationcapacity are discussed. The following conclusions can be made based on the results ofthis investigation:(a) Seismic performance of reinforced concrete frame column with high axialcompression ratio is improved significantly by the use of dense stirrups.(b) The failure form of RC frame column could be modified by using densestirrups,because the concrete is in a state of triaxial compression and the developmentof oblique cracks can also be inhibited.(c) The initial stiffness of RC frame column is not affected by the use of densestirrups. At the same time,the horizontal bearing capacity and the ductility of columnare enhanced.(d) The stiffness degradation of RC frame column with dense stirrups isrestrained and the bearing capacity of RC frame column is stable even though thehorizontal displacement of column is large.(e) The energy dissipation capacity of RC frame column columns with densestirrups is obviously better than the contrastive column.The FEM models of the RC frame columns with and without dense stirrups areestablished and the elastic-plastic analysis is carried out using versatile FEMsofeware-MSC.marc. The comparison between the FEM analysis and experimentalresults indicates that: the calculated hysteretic curve and skeleton curve have a goodagreement with the experimental results. The seismic performance of RC framecolumns with dense stirrups and higher axial compression ratio is discussed based onthe reasonable FEM analysis. The seismic performance and ductility of RC framecolumns are getting worse with the increase of axial compression ratio.更多还原