| Long-term corrosion in the environment of many steel works are often difficult to prevent the occurrence of corrosion through corrosion,corrosion in the steel structure of the cross-section weakened at the same time will result in the formation of the size of the surface,the depth of random distribution of the rust pit.The existence of the rust pits reduces the plasticity and fracture toughness of the steel,and accelerates the initiation and expansion of the cracks in the steel structure under the cyclic load and fatigue.Therefore,the corrosion has a great influence on the seismic performance of the steel structure.In this paper,the mechanism of seismic behavior degradation of stainless steel structure is revealed accurately,which provides technical basis for the evaluation of seismic performance of existing steel structure.The research work of corrosion behavior of corroded steel hysteresis constitutive model and the corrosion behavior of corroded steel column :(1)Based on the results of monotonically tensile and hysteresis test of corroded steel,the mechanical properties of steel with different degree of corrosion were analyzed.The constitutive model of the corroded steel skeleton under cyclic loading is established,and the corresponding hysteresis criterion is used to reduce the corrosion degree of the steel.The cyclic strengthening effect and the stiffness degradation The hysteresis constitutive model of corroded steel is proposed.(2)With H-shaped steel column as the object of study,seven steel columns were accelerated for about 15 months by accelerated corrosion test by atmospheric natural corrosion.A quasi-static test was carried out on a steel column with no rust and 7 different degrees of corrosion.The test results were analyzed from the aspects of failure morphology,hysteresis curve,skeleton curve,stiffness degradation,ductility and dissipation capacity.The effect of corrosion on the seismic performance of steel columns with different axial compression ratios is revealed,and the degradation law of hysteretic behavior of rusted steel columns is revealed.(3)Through the secondary development of large-scale general finite element software ABAQUS user material subroutine VUMAT,Fortran language is used to compute the hysteresis constitutive model subroutine of corroded steel.On this basis,the finite element analysis model of rust steel column is established The Compared with the results of finite element analysis and finite element analysis,it is found that the hysteresis constitutive model of the corrosion steel has a high accuracy and can reflect the hysteretic behavior of the corrosion steel.On this basis,the finite element analysis model An Effective Method for Study on Seismic Behavior of Rough Steel Structures. |
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