Steel tube stiffness calculator 1. EXTERNAL LOAD CALCULATIONS FOR DIRECT BURIED CONDUIT 25701 Science Park Drive Cleveland, Ohio 44122 216-464-3400 1-800-3CARLON (322-7566) www. To begin, choose a profile type and part number. Each material has different yield and ultimate strength properties that affect the calculations. Stiffness Shape factor kN/m² Gravel Sand 1. Round steel tubing works better for moving liquids as there are fewer points of resistance in its interior shape. Design factor (nd):The ratio of failure stress to allowable stress. required shear strength Torsional stiffness formula: From the definition, the torsional stiffness equation is written as, `K =\frac{T}{\theta }` From the torsional equation, we can write, `\frac{T}{\theta }= \frac{GJ}{L}` Where, G = Modulus of rigidity J = Polar moment of inertia L = Length of shaft. The transverse loading on a hollow structural section may result normal and shear stresses simultaneously on any transverse cross section of the HSS. Ultimate should be used to determine the bursting pressure. vyzxwjtrnndcnxabbdsspgudkipbenuvetvepgfumutekradnweczwjgheslgkfwzzsjnlbjcgyxkqo