Abstract：In this study, an experimental investigation on the stress-strain behavior of polypropylene fiber reinforced concrete under cyclic compression was conducted. The fiber volume fraction and aspect ratio were selected as the main variables. A total of 54 specimens were fabricated and tested. The results show that the failure of polypropylene fiber concrete is ductile. The envelope of the cyclic stress-strain curve is approximately in accordance with the monotonic stress-strain curve. The addition of polypropylene fiber may significantly improve the mechanical behavior of concrete in cyclic compression, increases compressive toughness, post-peak ductility and hysteretic energy dissipation capacity of concrete, and reduces the stress deterioration and stiffness, but it has slight effects on peak strength, elastic modulus and plastic strain. However, the fiber volume fraction has a more pronounced effect on the stress-strain behavior of concrete than fiber aspect ratio. Based on the experimental results and Chinese Code of Design for Concrete Structures, a constitutive model for polypropylene fiber reinforced concrete considering elasto-plastic damage in uniaxial compression is developed. The proposed model can serve as a theoretical reference for design of concrete structures, engineering application and revision of relevant technical specifications.
徐礼华 黄彪 李彪 池寅 李长宁 时豫川. 循环荷载作用下聚丙烯纤维混凝土受压应力-应变关系研究[J]. 土木工程学报, 2019, 52(4): 1-12.
Xu Lihua Huang Biao Li Biao Chi Yin Li Changning Shi Yuchuan. Study on the stress-strain relation of polypropylene fiber reinforced concrete under cyclic compression. 土木工程学报, 2019, 52(4): 1-12.
