EXPERIMENTAL AND ANALYTICAL RESEARCH ON SEISMIC BEHAVIOR OF ECC COLUMNS UNDER COMBINED TORSION

In order to study the seismic behavior of ECC composite columns, four ECC columns and one RC column were tested under axial force and lateral cyclic loading. On this basis, ABAQUS was used to analyze the ECC composite columns. The test results showed that the hysteresis curves of torque T-twist rate θ of the five specimens were all in inverse S-shape, and the pinch phenomenon was obvious; increasing fiber volume ratio, reducing stirrup spacing and increasing shear span ratio could slow down the degradation of strength and stiffness; under the same parameters, the peak torque and cumulative energy dissipation capacity of reinforced ECC columns were 1.65 times and 6.89 times of RC columns respectively, which showed that the hysteretic performance of reinforced ECC columns was better than that of RC columns.In addition, the simulation results of hysteretic curve of reinforced ECC columns were basically consistent with the test results, which showed that it was feasible to use ABAQUS to simulate the seismic behavior of reinforced ECC composite columns. Finally, the influence of different parameters on the seismic behavior of ECC composite columns was studied.