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I am a new user of the STKO software and thus not very experienced, but I am trying to learn. I am attempting to start an analysis of a simple masonry arch bridge. The attached geometry is a simpler version of what I will actually analyze. I am not sure why STKO is not starting the analysis, or why it is not providing me with a post-processing file as a result. Could you please help me identify the problem?

Hi, I am not sure about the unit system that you followed and its consistency. You should be consistent with the units of materials, geometry, and loading etc. Young's modulus for brick is provided as 1.2e6, is it in a typical range (I would say from 1000 to 15000 N/mm2). Please check it for other materials as well. For mass, the units should be in kg if the unit system is N-m-s or in ton if the unit system is in N-mm-s. Following are some specific points:

[1] I have modified some details in your model, which you can use as reference for further modeling. I assumed N-mm-s system and adopted some typical values of masonry materials. For example, Young's modulus of brick 3000 N/mm2, stone 10000 N/mm2 and filling as 100 N/mm2 (please refer to some standard texts).

[2] You don't have to use constant time series with 10 steps loading for elastic analysis. Just a single step with linear time step is sufficient.

[3] Please note that OpenSeesMP with multiple partitions does not support Eigen analysis. So, you should use single partition or use OpenSees sequential version.

Thank you for helping me!

You're welcome