DEPARTMENT OF THE ARMY
ETL 1110-2-536
U.S. Army Corps of Engineers
CECW-ED
Washington, DC 20314-1000
Technical Letter
No. 1110-2-536
31 December 1994
Engineering and Design
NONLINEAR INCREMENTAL STRUCTURAL ANALYSIS
OF ZINTEL CANYON DAM
1. Purpose
works projects and valuable experience is gained with
each new usage of the method. NISA is used primar-
This engineer technical letter (ETL) provides an
ily as a supplemental tool for the design of MCS in
example of the use of nonlinear incremental structural
order to: improve the cracking performance of a
analysis (NISA) for a massive concrete structure
particular type of structure which has exhibited unac-
(MCS).
ceptable cracking in the past; to more accurately
predict the structural behavior of an unprecedented
2. Applicability
structure, or to develop more cost effective structures
by revising the geometric configuration, materials or
This ETL applies to all HQUSACE elements, major
construction parameters.
subordinate commands, districts, laboratories, and
field operating activities (FOA) having responsibilities
b. Application to Zintel Canyon Dam. Appen-
for the design of civil works projects.
dix A presents a study conducted of the Zintel Can-
yon Dam in the Walla Walla District using the NISA
3. References
method of analysis. The dam was constructed using
RCC and the NISA study was conducted by CENPW
a. EM 1110-2-2006, Roller Compacted
after completion of construction. The study provides
insight into the use of NISA as an analytical tool for
Concrete.
designers.
b. EM 1110-2-2200, Gravity Dam Design.
5. Action
c. ETL 1110-2-365, Nonlinear Incremental
The enclosed study demonstrates the procedures
Structural Analysis of Massive Concrete Structures.
necessary to conduct a NISA analysis of a RCC
structure. NISA should be performed according to
4. Discussion
the requirements of ETL 1110-2-365.
a. Background. NISA is a developing technol-
ogy which has been used on several recent civil
FOR THE DIRECTOR OF CIVIL WORKS:
PAUL D. BARBER, P.E.
Chief, Engineering Division
Directorate of Civil Works
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