(1 苏州科技大学土木工程学院， 苏州 215011；2 中亿丰建设集团股份有限公司， 苏州 215131)

［摘要］ 为了研究压弯剪扭复合作用下钢筋聚乙烯醇纤维增强水泥基复合（PVA-ECC）柱的抗震性能，以轴压比、扭弯比、剪跨比为变化参数，设计了6个PVA-ECC柱试件和1个作为对比试件的普通钢筋混凝土柱，进行拟静力试验，分析试件破坏形态、滞回曲线、骨架曲线、延性及能量耗散等抗震性能指标。结果表明：在压弯剪扭复合作用下，7个试件均发生扭型破坏；与普通混凝土试件相比，PVA-ECC试件裂缝开展较为缓慢，其开裂荷载、屈服荷载、峰值荷载及极限扭率都明显提高，说明采用PVA-ECC材料能提高试件的复合受扭能力和变形能力；轴压比小、扭弯比大的试件扭转滞回曲线更为饱满，受扭延性更好；提高轴压比和剪跨比、减小扭弯比，试件受扭刚度退化加快；试件的受扭强度退化随试件的轴压比、剪跨比、扭弯比的提高而加快。 

［关键词］聚乙烯醇纤维增强水泥基复合（PVA-ECC）柱；压弯剪扭；扭弯比；剪跨比；抗震性能 

中图分类号：TU375-3 文献标识码：A文章编号：1002-848X(2021)22-0109-08

Experimental study on seismic performance of reinforced PVA-ECC columns under torsional load 

LING  Zhi1,  SHAO  Yongjian1,  FU  Shaohua1,  YI  Leping2 

(1 School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011，China；2 Zhongyifeng Construction Group Co., Ltd., Suzhou 215131， China) 

Abstract: In order to study the seismic performance of reinforced polyvinyl alcohol-engineered cementitious composite (PVA-ECC) columns under the combined action of compression-flexure-shear-torsion, the axial compression ratio, torsion-flexure ratio and shear-span ratio were used as parameters to study. Six PVA-ECC columns and one reinforced concrete column were designed for comparison. The failure pattern, hysteresis curve, skeleton curve, ductility and energy dissipation were studied by the quasi-static tests. The results show that under the combined action of compression-flexure-shear-torsion, torsional failure occurs in all 7 specimens; Compared with the ordinary concrete specimen, the cracks of PVA-ECC specimens develop slowly, and their cracking load, yield load, peak load and ultimate torsion rate are significantly improved, indicating that the composite torsional capacity and deformation capacity of PVA-ECC specimens can be improved by using PVA-ECC materials; The specimens with small axial compression ratio and large torsion-flexure ratio have fuller torsional hysteretic curves and better torsional ductility; The degradation of torsional stiffness is accelerated by increasing the axial compression ratio and shear-span ratio and reducing the torsion-flexure ratio; The degradation of torsional strength is accelerated with the increase of axial compression ratio, shear-span ratio and torsion-flexure ratio. 

Keywords:polyvinyl alcohol-engineered cementitious composite (PVA-ECC) column； compression-flexure-shear-torsion； torsion-flexure ratio； shear-span ratio； seismic performance

*苏州科技大学研究生科研创新计划项目（SKCX18_005），2018年江苏省研究生科研创新计划项目（KYCX18_2558）。

 作者简介：凌智，硕士，Email:578931232@qq.com。