322 BUILDING DETAILS 



bottom, as shown at e. The reinforcing rods of the canti- 

 lever girder are arranged as shown at /, g, h, and *'. The rods 

 in the upper part of the girder are arranged in three rows, 

 or layers, and are stopped off in length in practically the 

 same manner as the flange plates of a built-up girder, because 

 the bending moment is reduced toward the interior column. 

 Only one set of the reinforcing rods, as at f, extends entirely 

 through into the interior column, because the bending moment 

 is so reduced that this set is all that is required. The bottom 

 rods, as at ", are inserted to improve the resistance to com- 

 pression in the cantilever girder beam at the bottom. 



Both the girder and the cantilever bracket are well supplied 

 with stirrups, as shown at /. The vertical reinforcement of 

 the interior column is shown at k, and the ties and bracket 

 reinforcement, at / and m, respectively. The lintels, or con- 

 necting beams, at the end of the cantilever are shown at n. 



In Fig. 2 is shown a reinforced-concrete cantilever-founda- 

 tion construction designed to carry the same load on the 

 end of the cantilever as was required of the construction 

 illustrated in Fig. 1. As the cantilever girders have a 

 considerable projection beyond the foundation footings, they 

 must be very strongly reinforced in both the top and bot- 

 tom, as shown. The several details of this construction are 

 worked out in the illustration, and an analysis of these will 

 show that the several principal and secondary stresses 

 created in the structure are amply provided for 



BUILDING DETAILS 



LINTEL AND SPANDREL CONSTRUCTION 



There are two ways of arranging the beams and girders 

 in a building. These different ways bring different loads on 

 the spandrels 



In the construction shown in Fig. 1 (a), one-half of the floor 

 load from the beams a and b is concentrated at two points 

 upon the lintel, and the lintel has this load, as well as the 

 weight of the spandrel wall, to sustain. Also, as the beams a 



