Dynamic Failure Tests and Analysis of a Model Concrete Dam.

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Abstract:

A 160-scale model of the highest nonoverflow monolith of Koyna Dam was constructed on a foundation block and subjected to an impact force which produced cracking in the upper portions of the dam. The foundation block was connected to a massive concrete reaction structure by Belleville springs. The impact force was provided by a 1,000 lb wrecking ball mass moving as a pendulum. Instrumentation consisted of embedded strain gages and accelerometers attached to the foundation block and the upstream face of the dam. Vibration tests were conducted prior to the impact test and afterwards to determine natural frequencies and mode shapes. The initial velocity of the dam foundation system during the impact test was estimated at 25 inches per second. Internal strain time histories are presented and discussed. Damage to the model dam is compared to damage occurring in Koyna Dam during the Indian earthquake of 1967.

Author(s):
Norman, C. D.
Author Organization(s):
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
Descriptive Note:
Final rept. 1979-1981,
Pagination:
0030

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
WES/TR/SL-86-33
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_6_Net Centric; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_5.3.3_Develop Strategy; JCA_5.3.4_Develop Courses of Action; JCA_5.3.5_Analyze Courses of Action; JCA_1.2.5_Lessons Learned; JCA_1.2.6_Concepts; JCA_4.7.2_Installation Services; JCA_4.7_Base and Installations Support
Communities of Interest:
Air Platforms
Descriptor(s):
*DYNAMIC RESPONSE, *DAMS, VIBRATION, IMPACT, MODELS, ACCELEROMETERS, STRUCTURAL PROPERTIES, IMPACT TESTS, CRACKS, FAILURE, TEST METHODS, CONCRETE, STRAIN(MECHANICS), TIME, RESONANT FREQUENCY, MODEL TESTS, RESPONSE, INTERNAL, HISTORY, STRAIN GAGES, EMBEDDING, FOUNDATIONS(STRUCTURES), DYNAMIC TESTS, SPRINGS
Field(s)/Group(s):
Civil Engineering
Keyword(s):
Koyna Dam, Monoliths(Concrete), Belleville springs
Report Date:
1986 Sep 01