Abstract
The traditional Holmquist-Johnson-Cook (HJC) constitutive model does not consider the effect of crack resistance, reinforcement and toughening effect of high parameter steel fiber on original concrete. The causes of the analysis effect of the high parameter reinforced concrete is not obvious. To address this problem, a dynamic constitutive model of high parameter steel fiber reinforced concrete is built in this paper. Based on the static constitutive model built by static force, a dynamic constitutive model is built based on the similarity between static and dynamic stress-strain curve. On this basis, the yield surface equation, state equation, and damage evolution equation of HJC constitutive model are constructed. An improved HJC constitutive model for high parameter steel fiber reinforced concrete is obtained by introducing the modification of the steel fiber reinforced, toughened, and strain rate effects into the HJC constitutive model. Dynamic analysis of high parameter steel fiber reinforced concrete is achieved by using the improved model. Experimental results show that the proposed model is effective in analyzing high parameter concrete and has strong applicability.
Highlights
High parameter steel fiber reinforced concrete is a new type of multiphase composite material formed by adding large amounts of randomly distributed steel fibers into the normal concrete
In the constitutive model of high parameter steel fiber reinforced concrete, there is little research on dynamic constitutive model based on impact load
The dynamic constitutive model of high parameter steel fiber reinforced concrete is constructed to achieve the numerical analysis of the dynamic response of high parameter steel fiber reinforced concrete structure [7,8,9,10,11]
Summary
High parameter steel fiber reinforced concrete is a new type of multiphase composite material formed by adding large amounts of randomly distributed steel fibers into the normal concrete. In the constitutive model of high parameter steel fiber reinforced concrete, there is little research on dynamic constitutive model based on impact load. 2. Dynamic Constitutive Model Analysis of High Parameter Steel Fiber Reinforced Concrete. Based on the similarity of the stress-strain in the) static and dynamic state of the concrete. Es ε su − σ su ε sucurves material, the concrete stress-strain curve under static state can be modified by the similar assumption k = (ε − ε )(1 − σ su ). Based on the similarity of the stress-strain curves in the static and dynamic state of the concrete material, the concrete stress-strain curve under static state can be modified by the similar assumption that the damage evolution process is similar [15]. A dynamic damage constitutive model for high parameter steel fiber reinforced concrete is developed: σd =. On the basis of static constitutive model built by static force, the HJC constitutive model is improved and the dynamic constitutive model of the high parameter steel fiber reinforced concrete is constructed [20] to achieve the numerical analysis of the dynamic response of high parameter steel fiber reinforced concrete structure
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