A Dynamic Constitutive Model for Plant Fiber Concrete Under Impact Loading: Theoretical and Numerical Simulation Study

Feifei Qin1, Dongfa Sheng1, Zhengyi Chai1, Xiaowei Huo1
1School of Civil Engineering, Southwest Forestry University, Kunming, China

Tóm tắt

Plant fibers have enormous potential for enhancing concrete's impact resistance due to their exceptional toughness and ductility. Nevertheless, theoretical studies on the impact properties of plant fiber-reinforced concrete (PFRC) are still relatively few. Thus, it is crucial to investigate from a theoretical standpoint how plant fibers affect concrete's impact properties. Based on the modified Griffith fracture theory, this study established the relationship between plant fiber type and strain hysteresis factor. In order to simulate the damage process of PFRC, a micro-spring system was used. Based on this, a dynamic constitutive model considering the influence of plant fibers was proposed by combining the methods of damage mechanics and fracture theory. Parameter fitting and inverse analysis were used to validate the accuracy of the proposed model. Additionally, the mechanical behavior of four types of PFRC (Jute, Flax, Ramie and Sisal Fiber Concrete) under impact loading was simulated by the finite element method (FEM) using the proposed model. The results show that the predictions of the proposed model maintain a good of fit R2 more than 0.98 with the experimental results. The parameter fitting and inversion results also show that the proposed model has a good prediction. Simulation results show that sisal fiber-reinforced concrete exhibited the best performance among the four types of PFRC under identical loading conditions, offering more significant advantages for engineering applications. Theoretical and simulation studies on the impact properties of PFRC were conducted in this paper, and the findings are believed to provide a valuable methodological basis for the engineering application of using less expensive plant fibers to enhance concrete impact properties.

Tài liệu tham khảo

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