Abstract
The use of stainless steel rebars is required when reinforced concrete structures are subjected to harsh environmental conditions during their lifetime. Some special infrastructures in addition to these climatic factors can be also subjected to extreme limit states of loading and temperature as in the case of fire followed by blast. This study deals with the mechanical behaviour of austenitic stainless reinforcing steel at three high strain rates (250, 400 and 800 1/s) combined to elevated temperature ranging from 200 to 1000 °C. Proof and ultimate tensile strengths, ductility parameters, strain rate and temperature effects as well as strain hardening rate have been determined and discussed. The increase of the temperature leads to increased plastic strain rate, increased reduction area and decrease in yield and ultimate tensile strengths. An increase of the ductility parameters is observed in particular after the temperature of 600 °C. Based on these experimental results new reduction factors have been proposed in case of dynamic loading. Finally, material parameters for two constitutive models have been calibrated to provide prevision useful in the design of reinforced concrete structures subjected to combined action of fire and blast.
Published Version
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