ABSTRACT

Fatigue-induced cracks of tubular joints are common in aged offshore structures which can be strengthened using grouted clamp connections. However, only limited guidance is available for design of these clamps. Hence, a comprehensive experimental and numerical investigation on the behavior and capacity of the grouted clamped joints has been carried out. In order to obtain the deformation and ultimate capacity of joints experiments were conducted using scaled model (1:8) in laboratory and nonlinear FE analysis was performed using modified RIKS method. The numerical model has been validated using the results obtained from experiments and found to be in good agreement. Parametric studies have been performed for the parameters such as crack length ratio, grout properties, sleeve friction length ratio and slenderness. The capacity of grouted clamp joint increases minimum by a factor of 2 and 1.6 for compression and tension loads compared to unclamped cracked joint for the tested range.

摘要

管接头的疲劳引起的裂缝在老化的海上结构中很常见，可以使用灌浆夹具连接来加强。然而，只有有限的指导可用于这些夹具的设计。因此，对灌浆夹紧接头的行为和能力进行了全面的实验和数值研究。为了获得接头的变形和极限承载力，在实验室使用比例模型（1:8）进行实验，并使用改进的 RIKS 方法进行非线性有限元分析。数值模型已经使用从实验中获得的结果进行了验证，并且发现具有良好的一致性。对裂缝长度比、灌浆性能、套筒摩擦长度比和细长等参数进行了参数研究。