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Yes, @Celt83. I'm looking for the summation of stiffness matrices. But how to model is a plus. My goal is replicate shell-bar connection in a model and using the stiffness matrices. StructMnguy.

Thank you, @IDS . I'm checking the paper. StructMnguy.

@Celt83 Thank you. But have you ever seen a book or an example that covers the connection between a plate and a bar element? BTW thanks for the books, I will check them. StructMnguy.

Yes @ANE91 , I know the first thing you learn is a 2x2 stiffness matrix. But I'm looking for an example of the connection between the shell and bar stiffness matrix. Thanks BTW. StructMnguy

@ANE91 Thanks for the help! Do you know exactly how a shell element and a bar element are assembled in the stiffness matrix?

Hi everyone, I have a topic on my mind, Has someone ever seen the assembly matrix of a beam and a slab? Does Anyone know if there is a book that shows matrix algorithms used in structural software? I'm curious about that. Sorry for my writing but English is my second language. Thank you...