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TECHNICAL PAPERS

# A General Formulation for the Strength Design of Axially Loaded Planar and Multiplanar Tubular Joints

[+] Author and Article Information
Marcus M. Lee1

School of Civil Engineering and the Environment,  University of Southampton, Southampton 5017 1BJ UKmmkl@soton.ac.uk

Ellen M. Dexter

Formerly of Department of Civil Engineering,  University of Wales Swansea, UK

1

Corresponding author. Telephone +44 2380 592870.

J. Offshore Mech. Arct. Eng 127(2), 158-166 (Feb 03, 2005) (9 pages) doi:10.1115/1.1894410 History: Received October 06, 2004; Revised February 03, 2005

## Abstract

A database of newly generated numerical strengths of planar and multiplanar joints was used to assess the current offshore design code methodologies and to derive a new design equation, based on the AWS ovalization parameter concept. Within defined geometric limits, the proposed equation has been found to be generally applicable to any axially loaded joint configuration, provided that the braces do not overlap. It negates the need for potentially subjective brace classification to be carried out and accounts fully for planar and multiplanar effects. The proposed equation is fully validated against the planar and multiplanar data in the screened database complied by MSL Engineering, and has been shown to have similar accuracy as the existing design equations advocated by ISO, yet have significantly wider validity.

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## Figures

Figure 11

Measured–predicted capacity ratio statistics for planar data in MSL database

Figure 12

Measured–predicted capacity ratio statistics for multiplanar data in MSL database using the new methodology

Figure 7

Test of γ validity ranges for the new methodology

Figure 8

Residual γ effects in the new methodology using the entire MSL test database

Figure 9

Measured–predicted capacity ratio statistics for the new methodology predictions for the FE data

Figure 10

Measured–predicted capacity ratio statistics for the new methodology predictions for the multibrace joint data

Figure 1

AWS α definition for joints of arbitrary configuration [modified from AWS (1990)]

Figure 2

A typical planar K joint

Figure 3

Material curve

Figure 4

Measured–predicted capacity ratio statistics for AWS predictions for FE data of current study

Figure 5

Performance of the new methodology against the entire database of test and FE joints

Figure 6

Comparison of Eq. 3 (compression loaded T joints) with that of Vegte (vdV) (19)

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