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为提高柱的抗震性能,采用高延性纤维增强水泥基复合材料(ECC)部分代替钢筋混凝土柱底部的混凝土得到ECC/RC组合柱.采用MSC.MARC有限元软件分析了组合柱在低周反复荷载作用下的受力性能.分析发现采用ECC/RC组合柱能够显著提高柱的承载力、延性和耗能能力.然后探究了ECC高度、轴压比和纵筋配筋率3个参数对ECC/RC组合柱抗震性能的影响.结果表明:ECC高度在0.8h(h为截面高度)左右的组合柱近似可以达到全ECC柱的抗震性能;随着轴压比的增加,组合柱的承载力增加,而延性下降;在适当配筋的范围内,提高配筋率可以提高组合柱的延性和耗能能力,对承载力几乎无影响.分析结果对于ECC结构设计具有一定的指导意义和参考价值.
In order to improve the seismic performance of the columns, ECC / RC composite columns were obtained by replacing the concrete at the bottom of reinforced concrete columns with high ductility fiber reinforced cement-based composite (ECC) elements.Using MSC.MARC finite element software, The results show that the ECC / RC composite columns can significantly improve the bearing capacity, ductility and energy dissipation capacity of the columns.After that, three parameters of ECC height, axial compression ratio, RC composite columns.The results show that the composite column with ECC height of about 0.8h (h is the cross-section height) can achieve the seismic performance of the full ECC column. With the increase of the axial compression ratio, the bearing capacity of the composite column increases , While the ductility decreases.The reinforcement ratio can improve the ductility and energy dissipation capacity of composite columns with little influence on the bearing capacity in the range of proper reinforcement.The analysis results have certain guiding significance and reference value for ECC structure design.