7Soh A K, Soh C K. Stress concentrations of K tubular joints subjected to basic and combined loadings [J]. Proceedings of the Institution of Civil Engineers ,Structures and Buildings, 1996,116:19-28.
8Romeijn A,Wardenier J,de Koning C H M,et al. Stress and strain concentration factors of multiplanar joints made of circular hollow sections [C]// The Second International Offshore and Polar Engineering Conference. San Francisco ,USA, 1992:384-393.
9Efthymiou M ,Durkin S. Stress concentrations in T/Y and gap/overlap K-joints EC]//Proceedings of Conference on Behavior of OJfshore Structures. Amsterdam, Netherlands : Pergamon Publisher, 1985:429-440.
10Smedle P, Fisher P. Stress concentration factors for simple tubular joints[C]//Proceedings of First International Offshore and Polar Engineering Conference. Edinburgh, UK:International Society of Offshore & Polar Engineers Publisher, 1991 : 475-483.