API REPORT 82/83-46 Collapse Tests of Fabricated Cylinders Under Combined Axial Compression and External Pressure

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API REPORT 82/83-46 Document Information:

Title
Collapse Tests of Fabricated Cylinders Under Combined Axial Compression and External Pressure

American Petroleum Institute

Publication Date:
Feb 1, 1984

Scope:

EXECUTIVE SUMMARY

This report summarizes the results of collapse tests performed on 30 ring stiffened fabricated steel cylinders under combined axial compression and external pressure. The objective of these tests was to develop a data bank for fabricated cylinders which can be used to determine the adequacy of the design criteria given in the current API RP 2A recommended practice for fixed offshore structures.

The tests were sponsored by the American Petroleum Institute (API) and were conducted on specimens of three different geometries (D/t values of 48, 64 and 96) and two commonly used off shore platform materials (A36 and A572). The cylinder geometries were chosen such that failure stress levels would range from 0.5Fy to 0.9Fy when loaded by radial pressure only. Fabrication and inspection procedures used in offshore platform construction were followed. Initial shape and thickness measurements were made of all specimens before testing.

Test data gathered during loading included axial and radial displacements, strain measurements at likely failure locations and the failure loads.

The results of the tests described in the report as well as other applicable tests were compared with API RP 2A design rules and reasonably good agreement was found. The maximum ratio of failure stress to predicted stress was 1.32 and the minimum ratio was 0.93.

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