Cyclic loading on a rectangular section including bondslip

[hussien]

Hey,

i am trying to do a cyclic pushover test on a rectangular fiber section. i set it up with confined and unconfined concrete using concrete02, steel using steel02. bondslip material using a really high strain fiber section for the zero length element. but i am getting divergence issues and the cyclic results don't make sense. i attached the model, can you tell me what i could possibly be doing wrong?

[STKO Team]

Try this:

Guo.zip

(149.57 KiB) Downloaded 26 times

• Smaller time steps
• Stricter tolerance
• More stable algorithm

Pay attention to the BondSlip material. It seems a bit unstable. Also using a residual compressive stress for concrete would make the section fully unstable. use a very small, but not zero, residual stress