Research Papers: Structures and Safety Reliability

Experimental Evaluation of the Ultimate Bending Moment of a Slender Thin-Walled Box Girder

[+] Author and Article Information
José Manuel Gordo

Centre for Marine Technology
and Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Lisboa 1049-001, Portugal

C. Guedes Soares

Centre for Marine Technology
and Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Lisboa 1049-001, Portugal
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received September 13, 2014; final manuscript received January 4, 2015; published online February 6, 2015. Assoc. Editor: Myung Hyun Kim.

J. Offshore Mech. Arct. Eng 137(2), 021604 (Apr 01, 2015) (7 pages) Paper No: OMAE-14-1129; doi: 10.1115/1.4029536 History: Received September 13, 2014; Revised January 04, 2015; Online February 06, 2015

The results of a four points bending test on a box girder are presented. The experiment is part of series of tests with similar configuration but with different thickness and span between frames. The present work refers to the slenderest plate box girder with a plate's thickness of 2 mm but with a short span between frames. The experiment includes initial loading cycles allowing for partial relief of residual stresses. The moment curvature relationship is established for a large range of curvature. The ultimate bending moment (UM) of the box is evaluated and compared with the first yield moment and the plastic moment allowing the evaluation of the efficiency of the structure. The postbuckling behavior and collapse mode are characterized. Comparison of the experiment with a progressive collapse analysis method is made taking into consideration the effect of residual stresses on envelop of the moment curvature curve of the structure.

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Fig. 1

Layout of the experiment and real structure

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Fig. 2

Cross section (top) and stiffeners arrangement (bottom)

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Fig. 3

Tensile tests of 2 mm thick plate specimens

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Fig. 4

Typical tensile test of 3 mm thick plate specimen

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Fig. 5

Load–vertical displacement curves for four cycles of loading

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Fig. 6

Load–displacement relationship for initial cycles

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Fig. 7

Moment–curvature relationship for complete test

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Fig. 8

M–C curves for first two cycles of loading

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Fig. 9

M–C curves for collapse and damaged cycles of loading

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Fig. 10

Deformed shape of the box at collapse load viewed from opposite sides

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Fig. 11

Permanent deformations in the final of the test

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Fig. 12

Tangent bending stiffness on collapse cycle as function of curvature

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Fig. 13

Tangent bending stiffness on collapse cycle as function of bending moment

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Fig. 14

Comparison between experiment and predictions from progressive collapse methods

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Fig. 15

Ultimate moment and curvature versus residual stress normalized by yield stress




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