配筋工程水泥基复合材料复合受扭柱抗震性能研究和损伤分析

Research on Seismic Performance and Damage Analysis of Reinforced ECC Composite Torsional Columns

为研究配筋工程水泥基复合材料(Engineered Cementitious Composite,ECC)柱在压弯剪扭复合受力状态下的抗震性能,对11根配筋ECC试件和1根钢筯混凝土(Reinforcement Concrete,RC)试件进行拟静力试验,探究轴压比、扭弯比、剪跨比、纵筋配筋率、配箍率、纤维含量、原材料等参数对抗震性能和损伤指数的影响。结果表明:相较于RC柱,ECC柱的抗变形能力更强,复合受扭承载力和抗震性能也有显著提升;达到极限位移后ECC柱的扭矩下降平缓,其损伤进程也较为缓慢;对于ECC试件,适当提高轴压比、扭弯比、剪跨比和纤维含量能够有效抑制地震作用下构件的损伤;配箍率对于ECC柱的复合受扭承载力影响不大,但配置箍筋是必要的。

To study the seismic performance of reinforced Engineered Cementitious Composite(ECC)columns under the combination of compression,bending,shear and torsion,quasi-static tests were conducted on 11 reinforced ECC specimens and 1 reinforcement concrete(RC)specimen to investigate the effects of axial compression ratio,torsion bending ratio,shear-span ratio,longitudinal reinforcement ratio,stirrup ratio,fiber content,raw materials and other factors on seismic performance and damage degree.The research results indicated that compared to traditional reinforced concrete,ECC specimens showed better deformation resistance and significant improvements in seismic performance and composite torsional bearing capacity;after reaching the ultimate displacement,the torque of the ECC specimen decreased smoothly,and the damage process was also relatively slow;for ECC specimens,increasing the axial compression ratio,torsion-bending ratio,shear-span ratio,and fiber content appropriately could effectively suppress the damage of components under seismic action;the reinforcement ratio had little effect on the composite torsional bearing capacity of ECC specimens,but it was necessary to configure stirrups.