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| Hysteretic constitutive model of reinforcement based on stiffness damage and considering strength degradation |
| Received:November 07, 2021 Revised:May 24, 2022 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20211107001 |
| KeyWord:clough model cast-in-situ joints stiffness strength degradation subroutine Fortran |
| Author | Institution |
| 魏程风 |
河北工业大学 土木与交通学院, 天津 |
| 宗金辉 |
河北工业大学 土木与交通学院, 天津 |
| 李延涛 |
河北工业大学 土木与交通学院, 天津 |
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| Abstract: |
| The Clough model is widely used in the hysteretic simulation of hysteretic cast-in-situ joints.Aiming at the problem that the stress in the original Clough model may exceed the material's ultimate strength,this paper proposes an algorithm based on the stiffness damage of joints to derive the constitutive model of reinforcement.The algorithm successively establishes the relationship between the stiffness degradation of cast-in-situ joints and the degradation of reinforcement modulus,and the relationships between beam end displacement angle and reinforcement strain.According to the above relationship,the expression of reinforcement strength degradation is established,and the constitutive reinforcement model is obtained.Then,the UMAT subroutine of fiber element is written in Fortran language,and two examples are verified by using the finite element software ABAQUS.The simulated hysteretic curve has the pinch phenomenon;the shape of the curve is in good agreement with the test;the energy consumption and ductility can be close to the test,and it has certain advantages in predicting peak displacement angle.Meanwhile,the constitutive model has good convergence and high precision in two and three-dimensional models,which can be applied to practical engineering. |
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