ABSTRACT

Tubular joints in offshore structures is being designed using semi-empirical equations developed based on experimental and numerical studies and same were recommend for use in API-RP-2A and other codes. The parametric equation does not cover the tubular joints reinforced with internal ring-stiffeners. Hence, an attempt is made in the present study to develop parametric equations as a capacity enhancement factor (Q_r) to ultimate strength equation recommended for unstiffened joints by API-RP-2A. The development of Q_r for T/Y-joints under axial and moment load has been carried out using non-linear finite element. Numerical model has been validated using measured results from a scale model test conducted for this purpose and matches reasonably well. Parametric studies have been performed for various geometric non-dimensional parameters. The proposed parametric equations for ring-stiffeners in axial and moment load works well with the unstiffened equations specified in API-RP-2A enabling easy design procedure for ring-stiffened joints.

摘要

海上结构中的管接头正在使用基于实验和数值研究开发的半经验方程进行设计，并且推荐用于 API-RP-2A 和其他规范。参数方程不包括用内部环形加强件加固的管状接头。因此，本研究试图将参数方程作为承载能力增强因子 ( Q _r ) 发展为 API-RP-2A 推荐用于非加劲接头的极限强度方程。Qr_的发展已使用非线性有限元对轴向和力矩载荷下的 T/Y 接头进行了计算。数值模型已使用为此目的进行的比例模型测试的测量结果进行了验证，并且匹配得相当好。已经对各种几何无量纲参数进行了参数研究。所提出的环加强筋在轴向和力矩载荷下的参数方程与 API-RP-2A 中规定的非加强方程很好地配合，从而使环加强筋接头的设计程序变得简单。