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How to model lateral soil springs for long pile in SAP2000

How to model lateral soil springs for long pile in SAP2000

How to model lateral soil springs for long pile in SAP2000

(OP)
Hi all,

I am making a sap2000 model to demonstrate the lateral load acting on a long bored pile which resisted by lateral soil spring.
There is different soil layer that I make use of "2 joint LINK" to represent different spring stiffness at certain depth.

However, the BMD output is very weird that when I increase the stiffness of springs, the BM also increase.
When I decrease the stiffness of springs (say close to zero), the BM will be very small.

I think there is something wrong with my program setting, anyone can help? Thanks!!!!!

My link setting:
2 joint Link
fixed support at one joint
Link property = linear
directional: U1 only

RE: How to model lateral soil springs for long pile in SAP2000

(OP)
push, iam urgent....

RE: How to model lateral soil springs for long pile in SAP2000

Check local axes of your link. A linear link is spring stiffness K with option to include damping C. You might try modeling with 1 point link using the correct local axis and see if using a 1 point link solves the problem.

Multi-linear plastic spring can account for nonlinear soil PY TZ data.

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