It looks like you have deactivated the “Bending rigidstructure” option. Unchecking this option is recommended in the analysis of 2Dtruss models or models with elements without bending stiffness (like bars andmembranes). More information about this can be found in the following FAQ:
Howis the bending rigid structure option used?
In order to obtain the correct result you’ll have to check the“Bending rigid structure” option. This can be done in the descriptive modelfrom Menu bar > Assumptions > Structure (see the attached image).