Health monitoring simulation

[mmb]

How can I model a beam with crack at its bottom? When dynamic load apply on it crack opens and closes

Thanks
Best regards

[fmk]

look at using a beam col element (force or displacement), a fiber section and a uniaxial concrete material.

[mmb]

Thanks

[mmb]

Which one is correct or better?
1) Modelling a simply-supported beam as 50 elements and moving load (moves across the beam) acts on end node of each element and using load command
2) Modelling a beam as 1 element and moving load acts on element and using eleload command

What is the difference between them?