Stress-Slip Model of Steel Bar for Freeze-Thaw Concrete in Severe Cold Regions and OpenSEES Finite Element Simulation

Abstract

Abstract: On the basis of the local bond-slip model of freeze-thaw concrete and steel bar in severe cold regions, based on the analysis of the force mechanism of steel bar along anchorage length in the freeze-thaw concrete and the analysis of the iterative process, a calculation method for the steel bar stress-slip in the freeze-thaw concrete was established. The skeleton curve of stress slip relationship for steel bar in freeze-thaw concrete was proposed. Then, based on the finite element calculation software OpenSEES, the deduced stress-slip curve of steel bar in the freeze-thaw concrete was nested in the zero-length section element, and the element was applied to the beam column fiber model. The three existing freeze-thaw reinforced concrete frame columns were simulated and then compared with the test results. The results show that the numerical results of the freeze-thaw reinforced concrete column finite element model are in good agreement with the test results. It is verified from the component level that the deduced stress-slip curve of steel bar in the freeze-thaw concrete has good accuracy and reliability. The research results provide a theoretical reference for the derivation and finite element simulation for the stress slip of steel bar in freeze-thaw concrete in severe cold regions.

Key words: freeze-thaw concrete, finite element simulation, steel bar stress slip, zero-length section element, frame column, skeleton curve

CLC Number:

TU375

WU Wei, FENG Hu. Stress-Slip Model of Steel Bar for Freeze-Thaw Concrete in Severe Cold Regions and OpenSEES Finite Element Simulation[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3844-3850.

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