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EXPERIMENTAL AND ANALYTICAL RESEARCH ON SEISMIC BEHAVIOR OF ECC COLUMNS UNDER COMBINED TORSION
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摘要: 为了研究钢筋工程水泥基复合材料（ECC）复合受扭柱的抗震性能，完成了4个ECC柱和1个钢筋混凝土（RC）柱在低周反复荷载作用下的试验。在此基础上，采用有限元软件ABAQUS对钢筋ECC复合受扭柱进行了数值分析。试验结果表明：在复合受扭作用下，5个试件的扭矩T-扭率θ滞回曲线均呈反S形且捏缩现象明显；增加纤维体积率、减少箍筋间距、适当增大剪跨比均能减缓试件强度与刚度的退化；同等参数条件下，钢筋ECC柱峰值扭矩和累计耗能能力分别是RC柱的1.65倍和6.89倍，表明了钢筋ECC柱滞回性能要优于RC柱。此外，钢筋ECC柱的滞回曲线模拟结果与试验结果基本吻合，说明采用ABAQUS来模拟钢筋ECC复合受扭柱的抗震性能是可行的。最后，利用此方法研究了不同参数对钢筋ECC复合受扭柱抗震性能的影响规律。Abstract: 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.
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Key words:
- ECC column /
- combined torsion /
- seismic behavior /
- test /
- numerical simulation
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