摘要
对复材格栅增强高延性纤维水泥基(ECC)复合试件进行单轴拉伸试验,研究复材格栅厚度对复合试件拉伸力学性能的影响。在试验研究的基础上建立复材-ECC复合层轴向拉伸应力-应变本构关系模型,并与试验结果进行比较分析。试验结果表明:复材格栅与ECC界面间没有发生相对滑移,ECC试件的破坏模式为聚乙烯醇纤维被拉断或拔出破坏,而复材-ECC复合层试件的破坏模式为复材格栅断裂。复材格栅作为增强材料嵌入到ECC中,可以显著提高复材-ECC复合层的轴向刚度、极限承载力,明显改善其拉伸性能。计算结果表明:建立的预测模型与试验值吻合较好,可以有效地预测复材-ECC复合层的极限拉伸强度及轴向受拉应力-应变关系。
A uniaxial tensile test was conducted on the specimens of engineered cementitious composite （ECC） strengthened with fiber reinforced polymer （FRP） grid. The effects of FRP grid thickness on the tensile behavior of FRP-ECC specimen were investigated. Based on the experimental results, the stress-strain constitutive relationship model of FRP-ECC composite was proposed and compared with the experimental results. The test results showed that there was no relative slip at the interface of FRP grid and ECC substrate. The failure modes were the internal PVA fibers ruptured or pulled out from ECC substrate for the non-strengthened ECC specimens and the rupture of fiber reinforcements of Basalt Fiber Reinforced Polymer （BFRP） grid for the strengthened FRP-ECC specimens. The axial stiffness and ultimate capacity of the FRP-ECC specimen were obviously increased after the ECC internally strengthened with BFRP grid. The calculated results indicated that the proposed model had a good agreement with the experimental data and could effectively predict the ultimate tensile strength and the stress-strain relationship of FRP- ECC specimen under the uniaxial tensile loading.
出处
《工业建筑》
CSCD
北大核心
2016年第5期12-17,共6页
Industrial Construction
基金
国家自然科学基金项目(51278441
51578135)
中央高校基本科研业务费专项资金资助
江苏省普通高校研究生科研创新计划(KYLX15_0142)
