DEPARTMENT OF THE ARMY
ETL 1110-2-355
U.S. Army Corps of Engineers
CECW-ED
Washington, DC 20314-1000
Technical Letter
No. 1110-2-355
31 December 1993
Engineering and Design
STRUCTURAL ANALYSIS AND DESIGN
OF U-FRAME LOCK MONOLITHS
1. Purpose
design of other types of structures. First-time design-
ers of U-frames may overlook some of these key
assumptions and methods, possibly resulting in either
This engineer technical letter (ETL) provides guid-
an uneconomical or an inadequate design. The
ance for performing structural analysis of U-frame
monoliths for navigation locks.
appendixes to this ETL present a recommended pro-
cedure for design of U-frame lock monoliths, based
on recent experience at several design districts.
2. Applicability
4. Action
This ETL applies to all HQUSACE elements, major
subordinate commands (MSC), districts, laboratories,
and field operating activities (FOA) having responsi-
Structural engineers should review Appendix A prior
bilities for the design of civil works projects.
to initiating design of a U-frame lock. It should be
used as a guideline for developing the design process
and required design resources. Modifications to the
3. Discussion
recommended procedure may be appropriate based on
the designer's previous experience and on specific
Design and analysis of U-frame lock monoliths is a
project conditions. However, such modifications
complex structural engineering task. It involves
should be developed in consultation with the design
team, appropriate MSC personnel, and CECW-ED.
many assumptions and methods not required for
FOR THE DIRECTOR OF CIVIL WORKS:
2 Appendixes
PAUL D. BARBER, P.E.
APP A - Structural Design and Analysis
Chief, Engineering Division
of U-Frame Lock Monoliths
Directorate of Civil Works
APP B - References
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