Abstract
The formulations of the advanced concrete RHT model adopted in AUTODYN are investigated and numerical studies are conducted to study the RHT model’s actual performances under various loading conditions. It is found that using of default values in the RHT model is not able to simulate the realistic behavior of concrete under various loading conditions. Thus modified parameters in the RHT model are proposed to better capture the realistic behavior of concrete under such loading conditions. Furthermore, numerical simulation of normal concrete slabs and multilayer concrete slabs subjected to blast loading is conducted using AUTODYN with both the default and modified RHT parameters. Experimental readings from field blast tests are used to validate the numerical model developed. It is shown that the results from numerical simulations using the modified RHT parameters and the measurements from the field blast test agree well in terms of damage pattern, crater diameter, and acceleration. Hence, it can be concluded that the RHT model with modified parameters can capture the mechanical behavior of concrete structures well. The validated model can be further used to conduct a parametric study on the influence of key parameters (i.e., compressive strength, fracture energy, and thickness) on blast resistance of concrete structure.
Highlights
Around the world, one of the major construction materials used for both structural and infrastructural elements is concrete
This paper intensively studies the equation of the RHT model in the hydrocode AUTODYN
It is found that using the default RHT parameters such as hydrotensile failure criteria, residual strength parameters, and failure strain cannot predict the realistic behavior of concrete material under various loading conditions
Summary
One of the major construction materials used for both structural and infrastructural elements is concrete. Dedicated research has been devoted to the development of reliable methods and algorithms to accurately analyze behaviors of structures and infrastructures subjected to dynamic loadings. Some techniques such as the explicit numerical analysis codes AUTODYN [7] and LSDYNA [8] are available for the modeling of interactive behavior between blast wave and concrete structures. 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 materials. Conclusions are drawn on the basis of both the material model exploration and the simulations of concrete slab subjected to the blast loading
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