Masonry Magazine July 1970 Page. 19
An information series from National NCMA TEK 19
© 1970. National Concrete Massonry Association
Concrete Masonry Association
Concrete Masonry Construction Details-Apartment Buildings
ALL ASPECTS CONSIDERED, no building material or type of construction is more suited for multi-family residential building than load-bearing concrete masonry. Properly designed and built, this type of construction economically provides beauty and durability, thermal, sound, and fire insulation, and structural integrity.
Good construction details are necessary to the satisfactory performance of any structure. Engineered design of load-bearing concrete masonry construction utilizes the diaphram action of walls and floors to provide stability to the building. The result is taller buildings with thinner walls. For this reason it is very important that connections between intersecting walls and between walls and floors be of sufficient strength to safely transmit the loading expected on the structure. Importance of proper connection details has been demonstrated by the good performance of engineered masonry buildings, particularly in areas of high winds and seismic activity.
While construction details should be designed for a particular combination of materials and conditions, the following illustrations are presented to provide a guide to the designer covering a few of the more vital connection details for reinforced and non-reinforced concrete masonry walls. Included are wall intersection details, connection of walls to several commonly used types of floor and roof systems, and details for shear transfer through precast floor slabs.
INTERSECTING WALLS
1/4" round ties in mortar joint
Solid grout abutting cores
Joint reinforcement or hardware cloth in every second course
1/4" round ties around vertical bars
Outside bars extend around corner-inside bars extend as far as possible & bend into corner core
EXTERIOR WALL
BOND BEAM
30 bar diam. minimum
May 1970
Control joint
INTERSECTION OF BEARING AND NON-BEARING WALLS
Place metal lath or wire screen over cores to support mortar or concrete fill
1/4" x 1" x 30" strap anchors with 3" right angle bends at each end, at vertical spacings not exceeding 48" o.c.
BOND BEAM AT WALL INTERSECTION
Embed bent ends in cores filled with mortar or concrete
Concrete Units