Abaqus RC Joint Cyclic Model
Budget: $10 – $30 USD
I am building a detailed finite-element model of a reinforced-concrete beam–column joint in Abaqus 2017 and need help finalising the nonlinear setup for a reversed cyclic loading protocol. The goal is to generate reliable hysteresis curves that show the full pinching behaviour caused by bond-slip, while also reproducing concrete cracking, crushing and any strength degradation that follows.
Scope of the model
• All joint dimensions, the exact rebar detailing and realistic concrete material properties have to be represented so that strain localisation and confinement effects emerge naturally.
• Bond–slip must be treated explicitly. If you already have a reinforced-concrete bond UMAT or can write one from scratch, it must compile and run in Abaqus 2017 without licensing or compatibility problems.
• Material nonlinearity, contact-based slip, cyclic damage and stiffness recovery need to be captured in the same run so that the cyclic envelope and pinched loops agree with published test data.
Deliverables
- Fully documented .cae or input file, UMAT source code and any utility scripts.
- Plot of hysteresis loops (force–displacement and energy dissipation) highlighting pinching.
- Brief verification note comparing the model response with at least one experimental or published benchmark.
Acceptance criteria
A run on my workstation (Abaqus 2017 + Intel Fortran) must converge for the complete reversed cyclic protocol without manual intervention and reproduce the characteristic pinched loops within a 10 % tolerance of the chosen benchmark.
When you respond, please attach one or two examples of previous cyclic RC joint or bond-slip simulations—screenshots of hysteresis curves are ideal—so I can see your experience straight away.
Scope of the model
• All joint dimensions, the exact rebar detailing and realistic concrete material properties have to be represented so that strain localisation and confinement effects emerge naturally.
• Bond–slip must be treated explicitly. If you already have a reinforced-concrete bond UMAT or can write one from scratch, it must compile and run in Abaqus 2017 without licensing or compatibility problems.
• Material nonlinearity, contact-based slip, cyclic damage and stiffness recovery need to be captured in the same run so that the cyclic envelope and pinched loops agree with published test data.
Deliverables
- Fully documented .cae or input file, UMAT source code and any utility scripts.
- Plot of hysteresis loops (force–displacement and energy dissipation) highlighting pinching.
- Brief verification note comparing the model response with at least one experimental or published benchmark.
Acceptance criteria
A run on my workstation (Abaqus 2017 + Intel Fortran) must converge for the complete reversed cyclic protocol without manual intervention and reproduce the characteristic pinched loops within a 10 % tolerance of the chosen benchmark.
When you respond, please attach one or two examples of previous cyclic RC joint or bond-slip simulations—screenshots of hysteresis curves are ideal—so I can see your experience straight away.