PVA-ECC钢丝网复合薄板弯曲性能试验研究
袁微微1,杜文平2,杨才千2,3,王冲2,潘勇4,孟春麟4

(1.中设设计集团股份有限公司,江苏 南京 210000; 2.东南大学 土木工程学院,江苏 南京 210096; 3.湘潭大学 土木工程与力学学院,湖南 湘潭 411100; 4.江苏东部高速公路管理有限公司,江苏 盐城 224002)

PVA-ECC; 钢丝网; 弯曲性能; 刚度比; 裂缝开展

Study on the bending behavior of PVA-ECC thin compositeplates with steel wire mesh
YUAN Weiwei1, DU Wenping2, YANG Caiqian2,3, WANG Chong2, PAN Yong4, MENG Chunlin4

(1.China Design Group Co. Ltd., Nanjing 210000, China; 2. School of Civil Engineering, Southeast University, Nanjing 210096, China; 3.College of Civil Engineering and Mechanics, Xiangtan University, Hunan Xiangtan 411100, China; 4. Jiangsu Eastern Expressway Management Co. Ltd., Jiangsu Yancheng 224002, China)

PVA-ECC; steel wire mesh; bending behavior; stiffness ratio; crack development

DOI: 10.15986/j.1006-7930.2020.01.012

备注

为了研究聚乙烯醇纤维增韧水泥基复合材料(PVA-ECC)和钢丝网协同作用下试件的弯曲性能,本试验共设计了10组复合薄板试件进行四点弯试验,主要考虑钢丝网类型、钢丝网横向连接间距和层数等参数的因素.详细分析了试件失效特性、荷载 - 挠度曲线、强度、刚度和耗能能力.试验结果表明:PVA-ECC与钢丝网协同作用良好,二者结合大幅提升了PVA-ECC的抗弯性能,钢丝网的加入大幅提高了试件的强度、刚度和耗能性能,刚度提高38%以上,极限强度和耗能能力分别提高3倍和4倍以上; 随着钢丝网横向连接间距的增大,试件的力学性呈现出削弱的趋势.试件呈现出显著的应变硬化特性能和“多且密”的多缝开裂延性破坏特征.

To investigate the flexural behavior of Polyvinyl alcohol fiber-engineered cementitious composites(PVA-ECC)reinforced with steel wire mesh, a total of 10 groups of thin plates were investigated and studied under 4-point bending experiments. The key variables include the type, transverse wire spacing, layer number and location of welded wire mesh. The mechanical properties and failure modes of all the specimens were investigated in detail, including the failure modes, load-deflection curves, strength, stiffness and energy dissipation. Results showed that the PVA-ECC can work well with the steel mesh, and that the flexural properties of the PVA-ECC can be importantly upgraded. The stiffness was improved by 38%, and the ultimate strength and energy dissipation were 3 and 4 times higher than the control specimens, respectively. The parameter of transverse wire spacing had an important influence on the mechanical behaviors of the specimens, and they will be weakened with the increase in the transverse wire spacing. Moreover, the failures of the specimens were characterized by a strain-hardening behavior and multiple cracking development characteristics.