Abstract
The behaviour of an asphalt concrete structure subjected to severe loading, such as blast and impact loadings, is becoming critical for safety and anti-terrorist reasons. With the development of high-speed computational capabilities, it is possible to carry out the numerical simulation of an asphalt concrete structure subjected to blast or impact loading. In the simulation, the constitutive model plays a key role as the model defines the essential physical mechanisms of the material under different stress and loading conditions. In this paper, the key features of the Karagozian and Case concrete model (KCC) adopted in LSDYNA are evaluated and discussed. The formulations of the strength surfaces and the damage factor in the KCC model are verified. Both static and dynamic tests are used to determine the parameters of asphalt concrete in the KCC model. The modified damage factor is proposed to represent the higher failure strain that can improve the simulation of the behaviour of AC material. Furthermore, a series test of the asphalt concrete structure subjected to blast and impact loadings is conducted and simulated by using the KCC model. The simulation results are then compared with those from both field and laboratory tests. The results show that the use of the KCC model to simulate asphalt concrete structures can reproduce similar results as the field and laboratory test.
Highlights
The behaviour of structures or infrastructures under extreme loadings has become a hot topic in the area of civil, mechanical and material engineering
It is found that the Karagozian and Case concrete model (KCC) model would reproduce the real behaviour of settlements of the multi-layer under impacts,such in particular the second impactThen, load, though concrete‐like material underslab severe loadings, as blastunder and impact loadings
The key discrepancies exist at certain regions. of Asphalt concrete (AC) material under dynamic loadings are discussed, and the parameters controlling the behaviour parameters of AC materials using the KCC model are determined by laboratory static and dynamic tests
Summary
The behaviour of structures or infrastructures under extreme loadings has become a hot topic in the area of civil, mechanical and material engineering. Due to the general complexity of the constitutive models, the determination of the parameters (i.e., residual strength, failure strain and failure criteria in model) plays an important role in achieving the actual performance of the concrete-like materials. This requires sufficient understanding of the modelling formulation and the associated considerations. The KCC model [14] is used to simulate the AC material This model is capable of capturing the varied concrete-like material behaviours under different loading conditions. An application example on the AC structure under blast and impact loading is illustrated and validated based on a field blast test and a laboratory drop weight impact test
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