Resistance of Multi-Wythe Insulted Masonry Walls Subjected to Impulse Loads. Volume 1

The overall objective of this project was to define the dynamic flexural resistance of multi-wythe insulated masonry walls with specific emphasis placed on determining the potential application of foam insulation as a blast-resistant material. The project was closely coordinated with full-scale expl...

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Bibliographic Details
Main Authors: Browning, Robert S, Davidson, James S, Dinan, Robert J
Format: Report
Language:English
Subjects:
AIR FORCE FACILITIES
BARRIER COATINGS
BLAST
Construction Equipment, Materials & Supplies
DEGREES OF FREEDOM
Explosions
FINITE ELEMENT ANALYSIS
FLEXURAL PROPERTIES
FOAM
FULL-SCALE TESTING
IMPULSE LOADING
INSULATION
MASONRY
MATHEMATICAL MODELS
Mechanics
Numerical Mathematics
PE62102F
TEST METHODS
WUAFRL4915F2
Online Access:Request full text
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Summary:The overall objective of this project was to define the dynamic flexural resistance of multi-wythe insulated masonry walls with specific emphasis placed on determining the potential application of foam insulation as a blast-resistant material. The project was closely coordinated with full-scale explosive testing conducted by personnel at the Airbase Technologies Division of the Air Force Research Laboratory (AFRL) at Tyndall Air Force Base Florida. The project involved the following tasks: (1) use of finite element (FE) and single-degree-of-freedom (SDOF) analytical models for test analysis and prediction of results, (2) identification of the constitutive relationships of insulating foam(s), (3) synthesis of full-scale test methodology and results, (4) utilization of the data gathered from the full-scale tests to validate the FE models, (5) implementation of input parameter studies using the advanced FE models to characterize the mechanical behavior of the systems tested, and (6) development of engineering-level resistance definitions and multi-degree-of-freedom models of multi-wythe insulated masonry walls. Four standard wall section designs were recommended by the National Concrete Masonry Association (NCMA). Of these designs, two were selected for full-scale testing: a conventional block wall with a brick veneer and an A-block wall with a brick veneer - both with extruded polystyrene board insulation in the cavity and cells fully grouted. A single-wythe control wall with equivalent mass and flexural capacity was also included in the tests. FE models were used to assess the ability of the insulation to reduce the peak deflection of masonry walls subjected to impulse loads. Observations regarding the crushing of the insulation during the full-scale testing are also presented. The original document contains color images. Prepared in collaboration with Auburn University, Dept. of Civil Engineering, 238 Harbert Engineering Ctr, Auburn, AL. Work Unit No. Q210FA72.