钢筋PVA-ECC柱复合受扭性能试验研究及损伤分析  

Experimental study and damage analysis of reinforced PVA⁃ECC columns under combined torsion performance

作　　者：吴桐 邵永健[1] 李国建 WU Tong;SHAO Yongjian;LI Guojian(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;Zhongyifeng Construction Group Co.,Ltd.,Suzhou 215131,China)

机构地区：[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

出　　处：《建筑结构》2024年第1期86-92,共7页Building Structure

基　　金：2020年江苏省研究生实践创新计划项目(SJCX20_1109)。

摘　　要：为研究复合受力状态下钢筋PVA-ECC构件的受扭性能,进行了9根PVA-ECC柱和1根普通混凝土(RC)柱的单调加载试验,考虑不同轴压比、扭弯比、剪跨比、纵筋配筋率和箍筋间距等参数,研究其破坏特征、扭矩-扭率曲线特征,并进行了损伤演变分析。结果表明,PVA-ECC试件受力过程均经历了弹性阶段、弹塑性阶段和破坏阶段;PVA-ECC试件在受扭承载能力和扭转变形方面与RC试件相比有很大提升;降低轴压比、增大扭弯比和剪跨比可有效提高试件的扭转延性,减小箍筋间距和剪跨比、增大轴压比可有效延缓试件开裂;采用PVA-ECC材料能有效抑制试件的损伤发展;剪跨比、纵筋配筋率和箍筋间距对复合受扭作用下试件的损伤有较大影响;纵筋配筋率越大和剪跨比、箍筋间距越小,试件复合受扭的损伤程度越小。In order to study the torsional behavior of reinforced PVA⁃ECC members under combined loading,the monotonic loading tests of nine PVA⁃ECC columns and one reinforced concrete(RC)column were carried out.Different axial compression ratio,torsion⁃bending ratio,shear span ratio,longitudinal reinforcement ratio and stirrup spacing were considered as the parameters,the failure characteristics and torque⁃torque ratio curve characteristics were studied,and the damage evolution was analyzed.The results show that the stress process of PVA⁃ECC specimens have experienced elastic stage,elastic⁃plastic stage and failure stage;compared with RC specimens,PVA⁃ECC specimens have great improvement in torsional bearing capacity and torsional deformation.Reducing axial compression ratio,increasing torsion⁃bending ratio and shear⁃span ratio can effectively improve the torsional ductility of specimens,while reducing stirrup spacing and shear⁃span ratio and increasing axial compression ratio can effectively delay the cracking of specimens.The use of PVA⁃ECC materials can effectively inhibit the damage development of the specimen.The shear⁃span ratio,longitudinal reinforcement ratio and stirrup spacing have great influence on the damage of the specimens under the combined torsion.The greater longitudinal reinforcement ratio,the smaller shear span ratio and stirrup spacing,the smaller the damage degree of the specimens under the combined torsion.

关 键 词：PVA⁃ECC柱 受扭性能 轴压比 扭弯比 损伤演变 

分 类 号：TU375.3[建筑科学—结构工程]