From this it can be seen that properly reinforced stack bond masonry can be designed to be as strong as running bond construction. The value of joint reinforcement as a means of strengthening concrete masonry in the horizontal span is indicated in Figure 4 which shows the relative flexural strength with and without joint reinforcement. The flexural strength of stack bond walls spanning horizontally can be increased significantly by the use of bond beams or joint reinforcement. The use of pilasters or grouted cells will also be effective in increasing the resistance to TEK 14-6 © 2004 National Concrete Masonry Association NCMA TEK TEK 14-6 Structural (2004) concentrated loads. Stability will not be jeopardized if allowable stresses are not exceeded, but the use of reinforced bond beams will aid in distributing concentrated loads. In stack bond masonry, heavy concentrated loads will be carried down to the support by the particular vertical tier or “column” of masonry under the load, with little distribution to adjacent masonry. Compressive strength is similar for stack and running bond construction. STACK BOND CONSTRUCTION Excluding running bond construction, the most popular and widely used bond pattern with concrete masonry units is stack bond. Some building codes provide for variations in bond pattern to some extent by requiring the use of horizontal reinforcement, for example, when walls are laid in stack bond. While Stretcher bond is used for the construction of walls of half brick thickness whereas header. In header bonds, all bricks in each course are placed as headers on the faces of the walls. Header bond is also known as heading bond. When a different bond pattern is used it is advisable to consider its influence on the compressive and flexural strength of a block wall. Header is the shorter square face of the brick which measures 9cm x 9cm.
#Masonry stack bond vs running bond code#
Building code allowable design stresses, lateral support, and minimum thickness requirements for concrete masonry are based primarily on structural testing and research on wall panels laid in running bond construction. Because concrete masonry is often used as the finished wall surface, the use of bond patterns other than the traditional running bond has steadily increased for both loadbearing and nonloadbearing walls.
#Masonry stack bond vs running bond series#
Provided by: Cinder & Concrete Block Corporation National Concrete Masonry Association an information series from the national authority on concrete masonry technology CONCRETE MASONRY BOND PATTERNS Keywords: bond patterns, compressive strength, stack bond construction, tensile strength, testing INTRODUCTION Varying the bond or joint pattern of a concrete masonry wall can create a wide variety of interesting and attractive appearances using standard units as well as sculptured-face and other architectural units.
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