Title

Simulation of viscoplastic deformation of low carbon steel structures at elevated temperatures

Document Type

Article

Date of Original Version

7-1-2012

Abstract

The deformation response of a low carbon structural steel subjected to high temperature simulating fire conditions is generated using a viscoplastic material constitutive model which acknowledges the evolution of the material hardening parameters during the loading history. The material model is implemented in an ABAQUS subroutine (UMAT) which requires the determination of the material constants as a function of temperature. Both the temperature dependency and strain-rate sensitivity of the material parameters have been examined by the analysis of a single steel beam and a steel-framed structure subjected to temperatures ranging from 300 to 700 °C. Sequentially coupled thermal-stress analysis is applied to a structure under simulated fire condition. Results of this analysis show that above a transitional temperature, the deformation of the steel is strain-rate dependent. The combined effect of heat flux and loading rate on the complex deformation of a two-story steel structure is examined and the significance of employing a viscoplastic material model is discussed.©ASM International.

Publication Title

Journal of Materials Engineering and Performance

Volume

21

Issue

7

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