- Author
-
Yancey, C. W. C.
|
Scribner, C. F.
- Title
- Influence of Horizontal Reinforcement on Shear Resistance of Concrete Block Masonry Walls.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Report
-
NISTIR 89-42-2,
October 1989,
67 p.
- Distribution
- AVAILABLE FROM National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161. Telephone: 1-800-553-6847 or 703-605-6000; Fax: 703-605-6900. Website: http://www.ntis.gov
- Keywords
-
concretes
|
masonry
|
axial load
|
bond beams
|
concrete masonry
|
cracking load
|
cyclic loading
|
energy absorption
|
horizontal reinforcement
|
shear failure
|
shear wells
|
ultimate strength
|
shear strength
|
concrete blocks
- Abstract
- The primary objective of this investigation was to determine the effect of varying the amount and distribution of horizontal reinforcement on the in-plane shear resistance of concrete masonry walls. Thirteen wall specimens were constructed with hollow concrete block, and varying amounts of reinforcement in the bed joints and in grouted bond beams. The walls were subjected to reversed cyclic, in-plane lateral loads and an essentially constant axial compressive load. The blocks had an average gross area unit strength of approximately 1800 psi. The mortar conformed to the specifications of ASTM Type S. All of the walls were 48 in long and nominally 8 in thick. Three of the wall were 104 in high and the remaining ten walls were 56 in high. The applied axial compressive load was maintained virtually constant at 39,300 lbf for a given test. Preliminary results from these tests are that: 1) small amounts of horizontal reinforcement are effective in increasing post-cracking strength, 2) in-plane shear strength does not increase proportionately with increasing amounts of horizontal reinforcement, and 3) bed joint reinforcement placed in alternating courses is as effective in increasing in-plane shear strength as when placed in every course.