Research on Seismic Performance and Damage Analysis of Reinforced ECC Composite Torsional Columns
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 con-ducted 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 rati-o,stirrup ratio,fiber content,raw materials and other factors on seismic performance and damage de-gree.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 de-creased 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 ef-fectively 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.
reinforced ECC columnsquasi-static loadingcomposite torsionseismic performancePark-Ang methodcumulative damage index
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