“…Based on the similarity of web structure between SOWB and cellular beam, the calculation of the circumferential stress of web opening was studied through Vierendeel truss method. Under the premise of ensuring the rationality of the derivation, the following assumptions are made [ 23 , 24 ]. - The cross-section of SOWB is always plane before and after loading;
- The point of contraflexure of the bending moment caused by shear force is on the vertical center line of the round opening;
- The shear force acting on the web opening section is distributed to the upper and lower sections according to the section stiffness.
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