Experimental Study And Numerical Simulation On The Dynamic Split Tension Performance Of Reinforced Concrete

Reinforced concrete as a kind of structure engineering material, is the main raw material of buildings, which was widely used in military and civilian etc. Due to the diversity of its components, the mechanical properties of reinforced concrete is very complex, and the difference of characteristic parameters such as reinforcement ratio, the ratio of aggregate concrete also causes the change of material properties. Nowadays the experimental data of reinforced concrete is clearly not enough at domestic and overseas, especially under strong impact load, the related experimental data and the theoretical analysis of reinforced concrete materials is more rare. Therefore, under different reinforced ratio, the experimental research of reinforced concrete on the static and dynamic mechanical properties has a fundamental instructive significance on the analysis and design of reinforced concrete engineering structure.Because the strain rate of reinforcement concrete structures under impact loadings varies greatly and the reinforcement concrete is a rate-sensitive material, the strength, rigidity and fragility of reinforcement concrete are influenced by loading speed. Great error will occur if reinforcement concrete structures are designed with static parameters. It is of great importance to recognize the material characteristics and dynamic behavior of reinforcement concrete under different strain rate.In the present paper, experimental investigation on static and dynamic behavior of reinforcement concrete is carried out. Firstly, the most recent development of investigation on material characteristic under different strain rate of concrete are reviewed, and the static splitting tensile test principle is introduced briefly. Dynamic experiments are carried out to study the effect of strain rate and reinforcement ratio on the dynamic tension behavior of reinforcement concrete. According to the experimental results, with the increase of impact rate, strain rate of specimen, dynamic tension strengths increase in some extent. Based on the experiment, the effects of strain rate on the tension strengths of reinforcement concrete are summarized, tension strengths exhibit a critical strain rate beyond which large increases in strength occur. This critical strain rate is approximately2s-1for tension. Beyond these critical strain rates, the tensile strength shows a larger percentage increase. At the same time, with the increase of reinforcement ratio, dynamic tension strengths increase in some extent.Based on the former theoretical introduction, the test procedure is simulated by using finite element code LS-DYNA to get a view of distribution and variety of stress and to prove the effectiveness of dynamic test, which gives numerical simulation results that can be used to improve dynamic test method.