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Can someone upload the code required for recording the global stiffness matrix of the model? Now, I am trying to match the SAP2000 Model and OpenSees Model and I got into trouble for obtaining global stiffness matrix for OpenSees Model.

Because the zero - length elements exist in SAP2000 are defined in one node. In other words, there is no need for defining two nodes at the same coordinates in order to assign zero - length elements in SAP2000. Ans as you know, I have to constitute two nodes for zero - length element in OpenSees. Ho...

Hi Vesna, Thank for your reply. I checked the properties determined by SAP2000 and those I define in OpenSees input. There is no difference between them, however, the OpenSees Model has 60 degree - of - freedom due to the assignment of zero - length elements and each node which the zero - length ele...

Hi, I am trying to perform an modal analysis for my buried steel pipeline project. I use zero-length elements to model the soil surrounding the buried steel pipeline. The mesh size for this pipeline is assumed as 1 m and the mass of each 1 m pipe segment are assigned to the related nodes that are co...