What are the equations (compressive strength, flexural strength etc.) for concrete-filled double skin steel tube beams?

03 March 2018 0 4K Report

I have started my research on the concrete-filled double skin steel tube beam. I am trying to find the equations for Material and Geometric Limitations, compressive strength, flexural strength and Combined Flexure and Axial Compression for these concrete-filled double skin steel tube beams. So far, I could not find them. Please guide towards relevant literature in this regard.

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