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Structural Engineering and Mechanics Volume 56, Number 2, October25 2015 , pages 169-188 DOI: https://doi.org/10.12989/sem.2015.56.2.169 |
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Evaluating the spread plasticity model of IDARC for inelastic analysis of reinforced concrete frames |
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Mehdi Izadpanaha and AliReza Habibi
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| Abstract | ||
| There are two types of nonlinear analysis methods for building frameworks depending on the method of modeling the plastification of members including lumped plasticity and distributed plasticity. The lumped plasticity method assumes that plasticity is concentrated at a zero-length plastic hinge section at the ends of the elements. The distributed plasticity method discretizes the structural members into many line segments, and further subdivides the cross-section of each segment into a number of finite elements. When a reinforced concrete member experiences inelastic deformations, cracks tend to spread form the joint interface resulting in a curvature distribution. The program IDARC includes a spread plasticity formulation to capture the variation of the section flexibility, and combine them to determine the element stiffness matrix. In this formulation, the flexibility distribution in the structural elements is assumed to be the linear. The main objective of this study is to evaluate the accuracy of linear flexibility distribution assumed in the spread inelasticity model. For this purpose, nonlinear analysis of two reinforced concrete frames is carried out and the linear flexibility models used in the elements are compared with the real ones. It is shown that the linear flexibility distribution is incorrect assumption in cases of significant gravity load effects and can be lead to incorrect nonlinear responses in some situations. | ||
| Key Words | ||
| lumped plasticity; distributed plasticity; reinforced concrete; flexibility distribution; gravity load effects | ||
| Address | ||
| Mehdi Izadpanaha and AliReza Habibi: Department of Civil Engineering, University of Kurdistan, Sanandaj, Iran | ||