I'm working on 3D reinforced concrete column under cyclic loading and I need to consider the pinching effect. But I don't know how do it in Abaqus.
Can anyone help me?
thanks.
Please more describe your model. Pinching effect can be due to bond-slip effects or buckling in steel plate and etc. Are you going to verify an experimental paper?
Unfortunately Abaqus is not able to consider pinching effects of RC elements. This fact is also described in the literature [1][2]. However, Abaqus can well obtain the envelope under monotonic loading. By using this envelope you can define a MultiLinear Plastic Link in SAP2000 with Pivot hysteresis model [3]. I have attached a schematic representation of this modeling approach. In order to calibrate pinching parameters of pivot hysteresis model, there is another useful paper which I can suggest you [4].
This macromodel-based approach is completely reliable and even less time-consuming compared to detailed models.
[1] Wan S, Loh CH, Peng SY. Experimental and theoretical study on softening and pinching effects of bridge column. Soil Dyn Earthq Eng 2001; 21:75-81.
[2] Mousavi SA, Zahrai SM, Bahrami-Rad A. Quasi-static cyclic tests on super-lightweight EPS concrete shear walls. Eng Struct 2014;65;62-75.
[3] Dowell, RK, Seible, F, Wilson, EL. Pivot hysteresis model for reinforced concrete members. ACI Struct J 1998;
[4] Sharma, A, Eligehausen, R, Reddy, GR. Pivot Hysteresis Model Parameters for Reinforced Concrete Columns, Joints, and Structures. ACI Struct J 2013;
http://www.sciencedirect.com/science/article/pii/S0267726100000737
http://www.sciencedirect.com/science/article/pii/S0141029614000807
https://www.concrete.org/publications/internationalconcreteabstractsportal.aspx?m=details&ID=575
https://www.concrete.org/publications/internationalconcreteabstractsportal.aspx?m=details&ID=51684402
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