United States. Army. Corps of Engineers

Jeffrey A. Melby

U.S. Army Engineer Waterways Experiment Station

Paul F. Mlakar

Coastal and Hydraulics Laboratory (U.S. Army Engineer Waterways Experiment Station)

In this report, several level II reliability techniques are discussed and applied to breakwater design. Using these methods, the reliability and reliability index are determined for the dominant performance functions of a breakwater including stone and concrete armor stability, concrete armor structural response, runup, and overflopping. The methods include Taylor series finite difference (TSFD) methods, which are shown to be easily computed using a handheld calculator or spreadsheet. The TSFD method is shown to yield reasonable accuracy for preliminary comparison of various alternatives. An invariant iterative TSFD method and associated FORTRAN program are shown, which provide an improved approximation to the reliability for design and evaluation purposes.

Reliability Assessment of Breakwaters

Damage Prog[r]ession on Rubble-mound Breakwaters

Paul Francis Mlakar

Final Report

George F. Turk

CORE-LOC Concrete Armor Units

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 iterative 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 can add significantly to the unit's strength, while sacrificing little hydrodynamic stability, and that large dolosse over 30 tons require some strengthening scheme ... Armor units, Design, Breakwater, Dolos, Concrete, Hydraulic model.

Dolos Design Procedure Based on Crescent City Prototype Data

Dennis G. Markle

Thomas R. Kendall

Monitoring data for period 1989-1993. Report 1

Periodic Inspections of Dolosse on Crescent City Breakwater, Crescent City, California

Jeffrey A. Melby

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