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singular stress concentration, how to constraint this part?

singular stress concentration, how to constraint this part?

singular stress concentration, how to constraint this part?

(OP)
Hello all,
I am working on a solid model of structural cage with some ribs inside.
Constraints: fixed the first corner-point three movements; fixed the second corner-point two movements; fixed the third corner-point one movement. It does work in ANSYS.
Result: generate very high stress concentration on the first two points, just like the warning (singular stress concentration) before start the running. Actually, the result never can get convergence.
How to figure it out? Thanks you very much for help in advance.

Brain

RE: singular stress concentration, how to constraint this part?

(OP)
I already know why. Some torque generated cause that stress concentration.

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