Modified two-surface steel hysteretic model considering complex strain history
WANG Tong1, XIE Xu1, TANG Zhan-zhan1, SHEN Chi2
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; 2. International Project Group, Chodai Co., Ltd., Ibaraki 305-0812, Japan
The shortcomings of modified two-surface hysteretic model, which is a steel elasto-plastic hysteretic constitutive model that consider both analysis accuracy and efficiency, were taken as research object. The problem that under complex strain history, sometimes the stress results obtained by the model are irrational since the plastic modulus at the critical point between elastic and plastic stage tends to infinite, was to be avoid. The existing modified two-surface model was remodified by improving its criterion of stress-strain path. The improving method of the analysis model under uniaxial and multiaxial stress state was given. The comparison results with analysis results and uniaxial tensile and compression tests, and a series of example analysis show that the improved model can precisely predict the hysteretic property of steel under complex strain history. The accuracy and applicability of the improving method were validated at material and structural member level. Results show that improvement of existing modified two-surface model can effectively raise the computational precision under complex strain history of the model．
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