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Dear stko team
I have established a model of an underground structure using Rectangular FiberSection and forcebeam column element, while soil is simulated using quadup element. The model can run successfully, but in the post processing Gaussian point plot, there is no Gaussian point in the structure, and I cannot obtain the stress and strain of the structure. Is there a problem with where my model was set? I will attach my model below

like this
The presence of Gaussian dots can be clearly seen in the soil element, but not in the structure

It's because you are using the ElasticBeamColumn element. Since it is an elastic element it's analytically integrated (does not have gauss points or fibers in gauss points).
You can ask for "localForce" results and you will be able to see a beam diagram plot.

Otherwise use a generic ForceBeamColumn, and build a Fiber section with uniaxial materials, and you will be able to check:

• section.force (or section.deformation) in the gauss plot (beam integrated forces/deformations)
• section.fiber.stress (or section.fiber.strain) in the fiber plot

Dear stko team
I modified my model, used the forcebeamcolumn element, and established a fiber section. However, I still cannot see the Gaussian points of the structure during post processing. I attached my model below, and I don't know what went wrong

For a Gauss Plot you can see section.RESULT (i.e. a RESULT located at the section-gauss-point):
For a Fiber Plot you can see a result like section.fiber.RESULT (i.e. a RESULT located at every fiber of section-gauss-points): Note: Due to a recent change in OpenSees, if you use a Section Aggregator with a Fiber Section inside, you need to specify twice the "section" keyword, like section.section.fiber.RESULT
Here's a modified file: