STEEL LINTELS IN CONCRETE BLOCK WALLS HOW TO
STEEL LINTELS IN CONCRETE BLOCK WALLS FULL
STEEL LINTELS IN CONCRETE BLOCK WALLS CODE

The height of masonry above the lintel necessary for arching to occur in the wall (from Figure 2) is h + 8 in. (102 mm) bearing on each end, the effective span is:

Determine the height of masonry required for arching action. In addition, the deflection of lintels supporting unreinforced masonry is limited to the clear lintel span divided by 600 to limit damage to the supported masonry (ref. Lintels are required to be designed to have adequate stiffness to limit deflections that would adversely affect strength or serviceability. These uniform loads within the 45° triangle may be dispersed and distributed at a 45° angle onto the lintel (ref. Distribute the portions of uniform loads that are applied within the 45° triangle to the lintel.

STEEL LINTELS IN CONCRETE BLOCK WALLS FULL

Apply the full uniform load directly to the lintel without further distribution just as though there was no arching for those loads (ref.There are two schools of thought (see Figure 4):

STEEL LINTELS IN CONCRETE BLOCK WALLS HOW TO

2) does not address how to apply uniform loads that are applied within the 45° triangle. In most cases, this results in a uniform load acting over a portion of the lintel span. The load is then resolved onto the lintel as a uniform load, with a magnitude determined by dividing the concentrated load by this length. Loads applied within the triangle need to be considered, however.Ĭoncentrated loads are assumed to be distributed as illustrated in Figure 3. Any superimposed roof and floor live and dead loads outside this triangle are neglected, since they are assumed to be distributed to the masonry on either side of the lintel. This triangular load has a base equal to the effective span length of the lintel and a height of half the effective span. When arching occurs, the wall weight supported by the lintel is taken as the wall weight within the triangular area below the apex (see Figure 2 and Table 2). Self weight is a uniform load based on lintel weight (see Table 1). When arching is not present, the lintel self-weight, the full weight of the wall section above the lintel and superimposed loads are considered. The loads supported by a lintel depend on whether or not arching action can occur. 4), along with a detailed presentation of all of the allowable stress design provisions of the 2012 IBC. These are described in detail in TEK 14-7C, Allowable Stress Design of Concrete Masonry Based on the 2012 IBC & 2011 MSJC (ref. Significant changes were made to the allowable stress design (ASD) method between the 20 editions of the IBC. 2b, 2c), respectively, the reader is referred to TEK 17-1C (ref. 1b, 1c), which reference the 20 MSJC (refs. For designs based on the 2006 or 2009 IBC (refs.

STEEL LINTELS IN CONCRETE BLOCK WALLS CODE

1a), which in turn references the 2011 edition of the MSJC Code (ref. The content presented in this TEK is based on the requirements of the 2012 IBC (ref. This construction provides several benefits: it is considered to be more advantageous in high seismic areas or areas where high winds may be expected to occur control of wall movement due to shrinkage or temperature differentials is more easily accomplished and lintel deflection may be substantially reduced. Concrete masonry lintels have the advantages of easily maintaining the bond pattern, color, and surface texture of the surrounding masonry and being placed without need for special lifting equipment.Ĭoncrete masonry lintels are sometimes constructed as a portion of a continuous bond beam. Although lintels may be constructed of grouted and reinforced concrete masonry units, precast or cast-in-place concrete, or structural steel, this TEK addresses reinforced concrete masonry lintels only. Lintels and beams are horizontal structural members designed to carry loads above openings.

Steel lintels in concrete block walls