REPORT DOCUMENTATION PAGE 



Form Approved 

 OMB No. 0704-0188 



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 collection of information including suggestions for reducing this burden, to Washington Headquarters Services. Directorate for Information Operations and Reports, 1215 Jefferson 

 OavisHighway Suite 1204 Arlington VA 22202-4302. and to the Otficeof Management and Budget. Paperwork Reduction Project(0704.0188). Washington. DC 20503. 



1. AGENCY USE ONLY (Leave blank) 



2. REPORT DATE 



June 1993 



3. REPORT TYPE AND DATES COVERED 



Final report 



4. TITLE AND SUBTITLE 



Dolos Design Procedure Based on 

 Crescent City Prototype Data 



6. AUTHOR(S) 



Jeffrey A. Melby 



5. FUNDING NUMBERS 



7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 



USAE Waterways Experiment Station, Coastal Engineering 

 Research Center, 3909 Halls Ferry Road, Vicksburg, MS 

 39180-6199 



8. PERFORMING ORGANIZATION 

 REPORT NUMBER 



Technical Report 

 CERC-93-10 



9. SPONSORING /MONITORING AGENCY NAME(S) AND ADDRESS(ES) 



US Army Corps of Engineers 

 Washington, DC 20314-1000 



10. SPONSORING /MONITORING 

 AGENCY REPORT NUMBER 



11. SUPPLEMENTARY NOTES 



Available from National Technical Information Service, 5285 Port Royal Road, 



Springfield, VA 22161. 



12a. DISTRIBUTION /AVAILABILITY STATEMENT 



Approved for public release; distribution is unlimited. 



12b. DISTRIBUTION CODE 



13. ABSTRACT (Maximum 200 words) 



This design procedure includes statistical methods for determining a design 

 stress in a dolos armor layer. The methods characterize the structural response 

 as a single parameter: the maximum principal tensile stress in each dolos. Using 

 this approach, the dolos shape can be optimized for structural integrity and 

 hydrodynamic stability, and the design can be verified in the physical model. 

 Also, the structural response to the most significant loading mechanisms can be 

 computed separately and the individual statistical distributions combined to yield 

 a design stress distribution. The design stress is computed using this design 

 stress distribution and then compared to a fatigue -reduced strength. The itera- 

 tive optimizing design process can be accomplished using a user- friendly PC-based 

 computer program. 



It is shown that unreinforced normal -strength dolosse above 20 tons are often 

 underdesigned with respect to strength and can tolerate only slight movement and 

 the associated impacts. It is also shown that increasing the dolos waist ratio 



^Continued) 



14. SUBJECT TERMS 



Armor units 



Breakwater 



Concrete 



Design 



Dolos 



Hydraulic model 



15. NUMBER OF PAGES 



67 



16. PRICE CODE 



17. 



SECURITY CLASSIFICATION 

 OF REPORT 



unclassified 



18. SECURITY CLASSIFICATION 

 OF THIS PAGE 



unclassified 



19. 



SECURITY CLASSIFICATION 

 OF ABSTRACT 



20. LIMITATION OF ABSTRACT 



NSN 7540-01-280-5500 



Standard Form 298 (Rev. 2-89) 



Prescribed by ANSI Std Z39-18 

 298-102 



