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Marine Structures Research Recommendations: Recommendations for the Interagency Ship Structure Committee's FYs 1996-'97 and Later-Years Research Program
REVIEW OF COMPLETED PROJECTS
Projects completed since the 1994 annual report was published are listed in Table 5. Project descriptions follow, with the addition of a brief summary of the final report, which represents the CMS's understanding of the results as reported by the author.
Project reports have been published, are in publication, or will be available from the National Technical Information Service (NTIS), 5285 Port Royal Road, Springfield, VA 22161. The NTIS numbers are given with each project description, along with the SSC report number. NTIS numbers also appear in Table 6.
Many recent reports may be available from the executive director of the SSC. Requests may be mailed to Commander Stephen E. Sharpe, Commandant (G-MI/SSC), 2100 Second Street, SW, Washington, D.C. 20593-0001.
TABLE 5 Completed Projects
Number
Project Title
Page
SR-1338
Uncertainty in Strength Models for Marine Structures . . . . . . . . . .
86
SR-1339
Effect of High-strength Steels on Strength Considerations of Design and Construction Details of Ships . . . . . . . . . . . . . . . . . . . . . . . . .
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Marine Structures Research Recommendations: Recommendations for the Interagency Ship Structure Committee's FYs 1996-'97 and Later-Years Research Program
REVIEW OF COMPLETED PROJECTS
Projects completed since the 1994 annual report was published are listed in Table 5. Project descriptions follow, with the addition of a brief summary of the final report, which represents the CMS's understanding of the results as reported by the author.
Project reports have been published, are in publication, or will be available from the National Technical Information Service (NTIS), 5285 Port Royal Road, Springfield, VA 22161. The NTIS numbers are given with each project description, along with the SSC report number. NTIS numbers also appear in Table 6.
Many recent reports may be available from the executive director of the SSC. Requests may be mailed to Commander Stephen E. Sharpe, Commandant (G-MI/SSC), 2100 Second Street, SW, Washington, D.C. 20593-0001.
TABLE 5 Completed Projects
Number
Project Title
Page
SR-1338
Uncertainty in Strength Models for Marine Structures . . . . . . . . . .
86
SR-1339
Effect of High-strength Steels on Strength Considerations of Design and Construction Details of Ships . . . . . . . . . . . . . . . . . . . . . . . . .
86
SR-1341
Residual Strength Assessment for Damaged Marine Structures . . . . . .
87
SR-1342
Hydrodynamic Impact on Displacement Ship Hulls . . . . . . . . . . . . .
87
SR-1346
Improved Ship Hull Structural Details Relative to Fatigue . . . . . . . .
88
SR-1348
Measurement of Ice Loads on Ship Structures . . . . . . . . . . . . . . . . . .
88
SR-1350
Reexamination of Design Criteria for Stiffened Plate Panels . . . . . . .
89
SR-1351
Hull Structure Concepts for Improved Producibility . . . . . . . . . . . .
89
SR-1353
The Role of Human Error in the Design, Construction, and Reliability of Marine Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
90
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Marine Structures Research Recommendations: Recommendations for the Interagency Ship Structure Committee's FYs 1996-'97 and Later-Years Research Program
SR-1338 Uncertainty in Strength Models for Marine Structures (SSC-375) (NTIS PB95-126819)
Investigator Owen Hughes
Contractor Ross/McNatt Naval Architects, Stevensville, Maryland
Objective Quantify bias and uncertainty in structural-strength formulations in order to evaluate safety margins and derive design criteria.
Summary The report provides a methodology for the modeling and analysis of uncertainties in strength parameters that are suitable for the development of a reliability-based design method for ship structures. The report identifies the failure modes of principal structural members of ships that involve modeling uncertainty and, based on a review of sufficient test data, demonstrates the methodology. Data were collected about strength parameters for the selected failure mode of panel compressive collapse, and the method was applied to assess uncertainties. The report also identifies further research needs for uncertainty modeling and analysis of strength parameters.
Project Chair Rickard Anderson, Military Sealift Command, Washington, D.C.
Technical Adviser Paul H. Wirsching, University of Arizona, Tucson
SR-1339 Effect of High-strength Steels on Strength Considerations of Design and Construction Details of Ships (SSC-374) (NTIS PB95-100376)
Investigator Peter W. Buermann
Contractor Gibbs & Cox, Inc., New York, New York
Objective Analyze the in-service failures in construction details using high-strength steels, identify problem areas, and recommend design and construction details to reduce problems.
Summary The report calls attention to the problem of high-strength-steel structural details and provides a general methodology for assessing their strength using existing technology. Examples using this methodology are presented for existing high-strength-steel structural details that have presented problems in service.
Project Chair Philip G. Rynn, American Bureau of Shipping, Houston, Texas
Technical Adviser Roger G. Kline, Consultant—Ship Structures, New Berlin, Wisconsin
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Marine Structures Research Recommendations: Recommendations for the Interagency Ship Structure Committee's FYs 1996-'97 and Later-Years Research Program
SR-1341 Residual Strength Assessment for Damaged Marine Structures
Investigator Christopher J. Wiernicki
Contractor Designers and Planners, Inc., Arlington, Virginia
Objective Develop approaches to assess the residual strength and life of marine structures that have sustained damage in service.
Summary This report identifies key elements that are required to undertake an analysis to evaluate the residual strength of damaged marine structures. Emphasis is placed on assessing the residual strength of marine structures that have been damaged due to normal operating loads. The report summarizes methods that are available to industry for evaluation of damage such as fracture. An example problem is presented that represents the application of an integrated approach to residual strength assessment to a particular ship type.
Project Chair John S. Spencer, American Bureau of Shipping, Houston, Texas
Technical Adviser Maria Celia C. Ximenes, Chevron Shipping Company, San Francisco, California
SR-1342 Hydrodynamic Impact on Displacement Ship Hulls
Investigator John C. Daidola
Contractor M. Rosenblatt & Son, New York, New York
Objective Assess the state of the art in estimating forebody hydrodynamic impacts on displacement ship hulls, and develop a plan for future research on hydrodynamic impact loadings on marine structures. The plan must address slamming, wave slap, and “frontal” impacts.
Summary The report identifies theories of hydrodynamic impact loading that have been developed over the years by many researchers. These theories and prediction methods are evaluated to identify those that are the most accurate, identifying gaps and assumptions that exist in the current technology. These prediction methods are compared by applying them to two vessels. The report also identifies the need for future research to address the gaps and assumptions that are identified.
Project Chair Allen H. Engle, Naval Sea Systems Command, Washington, D.C.
Technical Adviser Subrata K. Chakrabarti, Chicago Bridge & Iron Co., Plainfield, Illinois
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Marine Structures Research Recommendations: Recommendations for the Interagency Ship Structure Committee's FYs 1996-'97 and Later-Years Research Program
SR-1346 Improved Ship Hull Structural Details Relative to Fatigue (SSC-379)
Investigator Karl Stambaugh
Contractor Consulting Naval Architects, Severna Park, Maryland
Objective Develop a series of improved structural details that account for the unique fatigue stress pattern of ship structures.
Summary The report presents a fatigue design strategy for welded ship structural details that is based on cumulative damage theory using nominal stress. The approach is modified to account for the complex geometry of welded structural details of ships. Fatigue notch factors and stress concentration factors are derived from experimental data and finite-element analysis. Guidance is provided showing detail designers how to improve the fatigue life of details by using this approach.
Project Chair Chao Lin, U.S. Maritime Administration, Washington, D.C.
Technical Adviser Robert L. Clark, Clark–Cim, Inc., Reston, Virginia
SR-1348 Measurement of Ice Loads on Ship Structures (SSC-376)
Investigator James W. St. John
Contractor Science Technology Corporation, Columbia, Maryland
Objective Develop a database on ice loads that could be used for probability-based design approaches. Assess the effects of ship displacement, impact location, and hull shape on the ice impact loads on icebreakers and other marine structures.
Summary Beginning in August 1992, the Nathaniel B. Palmer, a research vessel, operated for 3 weeks in mid-winter ice conditions, including first-year and second-year ice. In addition to an instrumented bow panel, there were instrumented panels on the starboard side, the transom, and on the bottom, so that the relative magnitudes of the impact loads could be compared for similar ice conditions but different hull locations. Data from a total of 800 ice-
impact events were obtained using the four instrumented hull panels.
This report covers instrumentation and data collection, analysis of the data gathered, and a comparison study between different ice-load measurement programs on different types of icebreakers.
Project Chair Rubin Sheinberg, U.S. Coast Guard, Washington, D.C.
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Marine Structures Research Recommendations: Recommendations for the Interagency Ship Structure Committee's FYs 1996-'97 and Later-Years Research Program
Technical Adviser none assigned
SR-1350 Examination of Design Criteria for Stiffened Plate Panels
Investigator Natale S. Nappi, Sr.
Contractor Designers and Planners, Inc., Arlington, Virginia
Objective Evaluate the effects of loadings such as vertical shear, membrane stress, and torsion in the mathematic model for stress analysis of stiffened plate panels, and propose revised design criteria as warranted.
Summary The report presents the results of a study conducted to determine the effect of the stiffness characteristics of the supporting members of a grillage structure on plate panel stress. Grillage scantlings were developed using a first-principles–based approach and then analyzed using finite-element analysis techniques to take into account the flexibility of the grillage stiffeners and to quantify the effects of vertical shear, membrane, and torsional stress components. The results are summarized, indicating that the stress in a plate panel can be 50 percent higher if the stiffeners deflect than if the stiffeners are rigid. Vertical-shear stresses are only 10 percent greater than normal stresses, and initial plate deflection does not significantly affect the behavior of stiffened plate structures. The report also provides recommendations for future research.
Project Chair Gary North/Todd Ripley, U.S. Maritime Administration, Washington, D.C.
Technical Adviser Hsien Yun Jan, Martech Inc., Neshanic Station, New Jersey
SR-1351 Hull Structure Concepts for Improved Producibility (SSC-377)
Investigator John C. Daidola
Contractor M. Rosenblatt and Son, Inc., New York, New York
Objective Develop alternative structural system concepts for selected ship types that decrease labor requirements in design, fabrication, and outfitting phases. The structural systems should also be capable of low-cost maintenance during the life of a vessel.
Summary The report establishes foreign ship production baselines that are then used to evaluate alternative structural concepts from a construction time and manpower viewpoint.
Project Chair Norman Hammer, U.S. Maritime Administration, Washington, D.C.
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Marine Structures Research Recommendations: Recommendations for the Interagency Ship Structure Committee's FYs 1996-'97 and Later-Years Research Program
Technical Adviser James R. Wilkins, Jr., Wilkins Enterprise, Inc., Riva, Maryland
SR-1353 The Role of Human Error in the Design, Construction, and Reliability of Marine Structures (SSC-378) (NTIS PB95-126827)
Investigator Robert G. Bea
Contractor Ocean Engineering Services, Moraga, California
Objective Perform a state-of-the-art assessment of the impact of human error (nonphysical factors) on the safety of marine structures. It would be a first step toward reducing the risk of failures due to human error and establishing procedures and guidelines to consider the effects of human error in design and the formulation of structural design criteria.
Summary The report presents an assessment of the influences of human error on the design, construction, and reliability of marine structures. The report categorizes human factors, considers relevant case studies, identifies qualitative and quantitative processes for evaluating the incidence and effects of human error, studies the impacts of human error on design guidelines, and evaluates how marine critical structural components and systems should be designed to accommodate human and organizational errors. The report also recommends fundamental approaches to improve the management of human and organizational errors in design and construction.
Project Chair John S. Spencer, American Bureau of Shipping, Houston, Texas
Technical Adviser Paul Fischbeck, Carnegie Mellon University, Pittsburgh, Pennsylvania; Marc Wilson, Dowling College, Long Island, New York.
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Marine Structures Research Recommendations: Recommendations for the Interagency Ship Structure Committee's FYs 1996-'97 and Later-Years Research Program
TABLE 6 Cross-Reference of Ship Structure Committee Project Numbers and Report Numbers
BY SSC REPORT NUMBER
BY SSC PROJECT NUMBER
SSC Report Number
SSC Project Number
NTIS Accession Number
SSC Project Number
SSC Report Number
338
1297
PB91-152330
1297
338
339
1308
PB91-152759
1298
346
340
1308
PB91-146191
1300
349
341
1313
PB91-153635
1301
358
342
1313
PB91-146209
1303
344
343
1320
PB91-152124
1304
347
344
1303
PB91-153262
1305
334
345
1321
Part 1
PB91-149476
1306
348
345
1321
Part 2
PB91-146043
1307
359
346
1298
PB91-146043
1308
339
347
1304
PB91-173070
1308
340
348
1306
PB91-169748
1309
353
349
1300
PB91-160325
1310
351
350
1312
ADA-232630
1311
352
351
1310
PB91-153304
1312
350
352
1311
Abridged version
PB92-163294
1313
341
1313
342
352
1311
4-volume set
PB92-176296
1314
362
1315
357
353
1309
PB91-173328
1316
354
354
1316
ADA-247671
1317
355
355
1317
PB91-153270
1319
366
356
1323
PB91-153288
1320
343
357
1315
PB91-169730
1321
345
358
1301
PB91-146035
1322
364
359
1307
PB91-193458
1323
356
360
1328
PB91-129270
1324
367
361
1327
PB91-133421
1326
363
362
1314
PB91-170241
1327
361
363
1326
PB91-193441
1328
360
364
1322
PB91-201343
1330
368
365
1332
PB92-163286
1331
**
366
1319
ADA-258160
1332
365
367
1324
ADA-268409
1333
370
367
1324
Appendix
PB94-102225
1334
371
368
1330
PB94-109675
1336
369
369
1336
PB94-121928
1337
373
370
1333
PB94-121936
1338
375
371
1334
PB94-121944
1339
374
372
1347
PB94-121951
1341
*
373
1337
PB94-188208
1342
*
374
1339
PB95-100376
1346
379
375
1338
PB95-126819
1347
372
376
1348
PB95-
1348
376
377
1351
PB95-
1350
*
378
1353
PB95-126827
1351
377
379
1346
PB95-
1353
378
* To be assigned. Report numbers for all projects have not been assigned.
** Proceedings and Summary of National Conference on Use of Composite Materials in Load-bearing Marine Structures. 1990. Washington, D.C.: National Academy Press.
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Marine Structures Research Recommendations: Recommendations for the Interagency Ship Structure Committee's FYs 1996-'97 and Later-Years Research Program
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