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工程用水泥基复合材料(ECC)是一种具有高延性、高韧性和多缝开裂特征的纤维增强水泥基复合材料,采用配筋ECC制作柱永久性模板,其内浇筑素混凝土形成组合柱。设计了4根外包配筋ECC组合柱和1根钢筋混凝土(RC)对比柱,开展拟静力试验,研究组合柱破坏形态和抗震性能。试验结果表明:ECC组合柱表现出明显的多缝开裂特征和更好的延性;随着剪跨比增加,柱端水平荷载-位移滞回曲线饱满,峰值荷载降低,但位移延性系数和能量耗散系数分别提高50%和185%;配箍率较高的构件,柱端水平荷载-位移滞回曲线较饱满,刚度退化较缓,变形能力较大。基于Open Sees平台,嵌入ECC材料本构模型,模拟了试验柱端水平荷载-位移曲线,并与试验结果进行对比,验证了有限元模型的准确性。
Engineered Cement-Based Composites (ECC) is a fiber-reinforced cement-based composite material with high ductility, high toughness and multi-slit characteristics. Reinforced ECC is used to create a column permanent formwork, in which poured plain concrete forms a composite column. Four outsized RC composite columns and one reinforced concrete (RC) comparison column were designed to simulate the failure mode and the seismic performance of composite columns. The experimental results show that the ECC composite columns show obvious multi-crack characters and better ductility. With the increase of the shear span ratio, the horizontal load-displacement hysteresis curve of the column ends is full and the peak load decreases. However, the displacement ductility coefficient and energy consumption The coefficient of dispersion is increased by 50% and 185% respectively. For the component with higher stirrup ratio, the horizontal load-displacement hysteresis curve is more full, the stiffness degenerates slowly and the deformation capacity is larger. Based on the Open Sees platform, the constitutive model of ECC material was embedded to simulate the horizontal load-displacement curve of the test column. The accuracy of the finite element model was verified by comparing with the experimental results.