BUILDING DETAILS 



323 



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and b extend into the lintel, it must at least be equal in depth 

 to the depth of these beams. Thus, the height of the window 

 opening is materially reduced. 



The method of framing shown in Fig. 2 (6) is frequently 

 employed. The girders, instead of extending from column 

 to column, as shown at c in view (a), extend from column 

 to wall pier; consequently, the beams extend in a direction 

 parallel with the lintel. The slab spans from the beam a 

 to the lintel b. The lintel carries one-half of the slab load 

 between these structural mem- 

 bers and is required to sustain 

 the weight of the spandrel as 

 well. The advantage gained 

 by this method of construc- 

 tion is that there are no beams 

 abutting the lintel. Thus, this 

 member may be reduced in 

 depth to the very minimum for 

 strength required to support 

 the small floor load and the 

 weight of the spandrel wall. 



The style of lintel shown in 

 Fig. 2 (a) is the one in most 

 common use. The girders 

 are arranged, as shown in 

 Fig. 1 (b), so that the lintel 

 carries only part of the slab 

 and the spandrel section. 

 The lintel is made as shal- 

 low as possible, so as to admit 

 maximum light by having 

 ceiling. 



When no beams are used and the slab spans from girder 

 to girder, the lintel carries no load except the weight of the 

 spandrel. In this case, reinforced concrete is sometimes 

 dispensed with and a brick arch employed, as shown in 

 Fig. 2 (6).. The arch, however, cuts off the top corners of 

 the window, and thus somewhat reduces the amount of light 

 that can be admitted. 



FIG. 1 



the window head 



near the 



