Hi Bassem Ali

It sounds like you are having some trouble with running a P-Delta analysis on your model. There could be several reasons why the analysis fails or gives inaccurate results. Here are some possible causes and solutions that you can try:

• Check if your model has any instability or singularity issues. Sometimes, the model may appear to be connected and stable, but there could be some hidden errors or gaps that cause the analysis to fail. You can use the Model Check feature in midasStructure to detect and fix any problems with your model geometry, connectivity, boundary conditions, and load cases.
• Check if your model has any large displacements or rotations that exceed the linear assumptions of the P-Delta analysis. If your model is highly nonlinear or has large deformations, you may need to use a more advanced analysis method, such as Nonlinear Static Analysis or Nonlinear Dynamic Analysis, to account for the material and geometric nonlinearity of your structure.
• Check if your model has any slender or flexible members that are prone to buckling or vibration. If your model has long or thin members that have low stiffness or high slenderness ratios, they may experience buckling or vibration under axial or lateral loads. You can use the Buckling Analysis or [Modal Analysis] features in midasStructure to identify and evaluate the critical buckling modes and natural frequencies of your structure. You can also use the [Design Check] feature to verify if your members meet the code requirements for stability and strength.
• Check if your model has any convergence issues or numerical errors. Sometimes, the P-Delta analysis may not converge or give accurate results due to the iterative nature of the method. You can adjust the [Analysis Options] in midasStructure to control the convergence criteria, iteration limit, tolerance, and damping factors of the P-Delta analysis. You can also use the [Result Verification] feature to check the accuracy and validity of your analysis results.

Because could not put all information in the project as one of the professors in Iran suggest me in thus regard

I used the Tekla, Revit and 3D Solid and other softwares