Verification Example 04
Download Example 4 model (v2.7.0)
Description
This example describes how to model the end releases in GiD+OpenSees. Three identical models have been created: they only differ each another for the types of end releases (i.e. Model A has a shear release, Model B an axial release and Model C a moment release). The results obtained with the FE analysis program GiD+OpenSees at specified joints are compared with SeismoStruct. The FE models lie in the X-Y plane.
Geometry and Properties
Material Properties:
E=24.81988964 GPa
Section Properties:
A=0.0929 m2
I=0.0007192 m4
Modeling and Loading
The members have a rectangular solid section (rss) that employs the elastic material type.
Three different models have been considered:
• Model A : Shear release
• Model B : Axial release
• Model C : Moment release
The end releases defined in models, are modeled by using a link element.
Node 1 is fully restrained, whereas node 4 is restrained in Y, Z, RX and RY.
The FE models are shown below:
Model A
Model B
Model C
Analysis Type
Static analysis (with geometric nonlinearities disabled)
Results and Comparison
The most significant results are compared in the table below:
| Model | Output Parameter | GiD+OpenSees | SeismoStruct 2016 |
|---|---|---|---|
| A | Fy,1 [kN] | 0 | 0 |
| A | Mz,1 [kNm] | -67.7875 | -67.7875 |
| B | Fy,1 [kN] | 0 | 0 |
| B | Mz,1 [kNm] | -67.7875 | -67.7875 |
| C | Fy,1 [kN] | 22.24 | 22.24 |
| C | Mz,1 [kNm] | 0 | 0 |
Fani Derveni, Vassilis K. Papanikolaou