ETL 1110-2-365
31 Aug 94
being pursued is acceptable to all elements involved.
entitled "Nonlinear, Incremental Structural Analysis."
Representatives from CECW-ED and CECW-EG and
Required report content is identified in Appendix A.
their counterparts from the division office reviewing
the project documents should be present at these
e. Deviations. Any deviation from specific
meetings.
requirements of the enclosed guidance requires con-
sultation with and the approval of CECW-ED. Such
(6) Actual construction conditions may not
approval should be obtained in advance of the analy-
match the assumed conditions used for the NISA.
sis. Approval is required for actions such as deletion
When this occurs, the team should evaluate the
of required parameter combinations, use of narrow
altered conditions and determine the need to revise
bandwidths without material property tests, or use of
the design or conduct additional NISA studies.
a computer code other than ABAQUS (Hibbitt,
Karlsson, and Sorenson 1989) with the ANACAP-U
d. Documentation. Results of the NISA should
subroutine (ANATECH Research Corp. 1992).
be documented in a separate design memorandum
FOR THE DIRECTOR OF CIVIL WORKS:
2 Appendices
PAUL D. BARBER, P.E.
APP A - Nonlinear, Incremental Structural Anal-
Chief, Engineering Division
ysis (NISA) of Massive Concrete Structures
Directorate of Civil Works
APP B - Examples
3
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