How to find ulimate load capacity of concrete beam using Nonlinear FE Analysis in ansys workbench?

Nonlinear Finite Element Analysis (FEA) of a concrete beam with reinforcement involves simulating the behavior of the beam under load beyond its linear elastic range. The Drucker-Prager model is a common plasticity model used to capture the nonlinear behavior of concrete in ANSYS. Here's a general procedure for performing nonlinear FEA of a concrete beam with reinforcement in ANSYS Workbench:

Geometry and Meshing: Create the 3D geometry of the concrete beam with the correct dimensions and reinforcement layout. Mesh the model with appropriate element types. For concrete, you can use solid elements (e.g., SOLID185) with sufficient refinement near regions of high stress or strain concentration.

Material Properties: Define the material properties for the concrete and reinforcement. For the concrete, you'll need to specify parameters for the Drucker-Prager model, such as cohesion, friction angle, dilatancy angle, etc. The reinforcement properties will include modulus of elasticity and yield strength.

Boundary Conditions: Apply the appropriate boundary conditions. Typical boundary conditions for a concrete beam include fixing the base to represent support and applying loads at specific points or areas to simulate the desired loading scenario.

Step Settings: Set up the analysis steps. In a nonlinear analysis, you'll typically use multiple steps to gradually apply the load. For example, you might apply an initial step to apply self-weight and then add subsequent steps to apply additional loads.

Load Application: Apply the load step by step, following the desired loading sequence. You can apply point loads, distributed loads, or any other type of load as required.

Solver Options: Choose appropriate solver settings, such as convergence criteria, maximum iterations, and element formulations.

Solution: Run the analysis. The solution will proceed step by step, and the model's response will be updated at each increment. The Drucker-Prager model will capture the concrete's nonlinear behavior as it approaches failure.

Results and Post-processing: After the analysis is complete, examine the results. You can view stress and strain distributions, as well as deformation and failure patterns in the concrete beam.

Finding the ultimate load capacity of the concrete beam in the nonlinear FEA involves incrementally increasing the load until the model experiences failure. This could be concrete crushing or reinforcement yielding, depending on the model assumptions. The ultimate load capacity is the maximum load the beam can sustain before failure occurs.

To determine the ultimate load capacity:

Observe the load-displacement curve from the analysis. Note the load at which the response starts to show significant nonlinear behavior or failure initiation.
You can perform multiple analyses with incrementally increasing loads until failure occurs.
Based on the results, identify the ultimate load capacity of the concrete beam with reinforcement.

Please note that the specific implementation in ANSYS Workbench can vary depending on the version and available features. The steps provided here give a general outline of how to conduct a nonlinear FEA for a concrete beam with reinforcement and find its ultimate load capacity using the Drucker-Prager model.

Chirag A Kapatel

Sir, Thank you for your answer and Support.

Sir , I had modeled RC concrete beam 5m length and 300mm X 600mm Cross-sectional with Main reinforcement and stirrups in anysy workbench according to Dr. Dydlo vedio. I had applied -80 mm displacement to find the ultimate load carrying capacity. I had use the apdl file given by Dr Dydlo vedio.

Help me in the material property definition in the APDL command according to the Multilinear Elasticity material model and Drucker-Prager Model.

How can I get actual behaviour of concrete under failure load?

Please provide your valuable knowledge and share your experience with me.

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