Abstract：Considering different types of fiber reinforced polymer (FRP) grid, reinforcement layer and cyclic loading method, the digital image correlation (DIC) measurement technique and traditional strain gauge measurement method were used to investigate the uniaxial tensile mechanical behavior of FRP grid-engineered cementitious composites (FRP/ECC) material and the availability of DIC measurement technique. Based on the experimental results, a cyclic tensile constitutive model of FRP/ECC composites was proposed. The test results indicate that the characteristic of FRP grid and the high ductility and multi-cracking properties of ECC were fully utilized in the basalt grid reinforced ECC (BFRP/ECC) composite system. The ultimate tensile strength of FRP/ECC was improved greatly with the reinforcement of FRP grid. The loading schemes may greatly affect the behavior of loading/unloading behavior, but they have no significant effect on the ultimate stress/strain of FRP/ECC material. The deformation recovery ability of BFRP/ECC is better than that of CFPR/ECC. By making use of the DIC measurement, the generation and propagation of cracks can be effectively captured, the failure mode can be observed and the whole stress-strain curves of specimens can be obtained. The calculation results show that the proposed stress-strain relationship agrees well with the experimental results and can effectively predict the cyclic tensile constitutive relationship of FRP/ECC composites.
朱忠锋 王文炜 郑宇宙 田 俊 谈 笑. 基于非接触式观测技术的FRP/ECC复合材料#br#
反复受拉本构关系模型[J]. 土木工程学报, 2019, 52(10): 36-45, 55.
Zhu Zhongfeng Wang Wenwei Zheng Yuzhou Tian Jun Tan Xiao. The constitutive model of FRP/ECC composite materials under uniaxial cyclic tensile loading based on the digital image correlation technique. 土木工程学报, 2019, 52(10): 36-45, 55.
