Nonlinear Response Analysis Model of RC Members Based on Force-Based Fiber Model With Shear Effect

Abstract eng:
In nonlinear Response analysis of reinforce concrete (RC) structures and/or members, the shear effect is usually neglected for the members with large shear span ratio, such simplification is acceptable and does not results in much error. While the inelastic shear deformation cannot be ignored for those with small shear span. These members include deep beams, short columns, shear walls, etc., which are often subjected to damage in previous earthquakes. Current beam-column elements with fiber section offer an accurate and efficient nonlinear analysis model for RC structures and/or members, which are only suitable for the members with large shear span ratio. In order to consider the shear effect on the members with small shear span ratio and make full use of the advantages of the flexibility method, in this paper the shear effect is added into the forcebased fiber model, which could separately consider shear yielding and/or flexural yielding. Firstly, the force interpolation function is modified to establish shear force field in the integration section. Secondly, the famous Park three-parameter hysteretic model is employed to simulate the relationship of the shear force-shear deformation. Thirdly, the parameter value of the feature points in Park three-parameter hysteretic model for two kinds of members (short column and shear wall) are suggested based on plenty of literature investigation, therefore the model is more practical. Fourthly, the modified fiber model is embedded into the user subroutine UEL in ABAQUS by second development. Finally, two numerical examples (short column and shear wall) are carried out based on the modified force based fiber model. The results show that the force-based fiber model with shear effect is reliable and effective, and that it is appropriate for the members with small shear ratio to consider the hysteresis of shear effect.

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