CHAPTER V 

 SLABS, CROSS-BEAMS, AND GIRDERS 



55. Slabs. Only the style of slab occurring in all-concrete 

 construction will be considered at this time, in order to bring 

 forward the treatment of T-beams clearly. Fig. 66 shows a 

 finished floor slab in this type of construction in a building. A 

 somewhat similar construction will be found in beam and girder 

 bridges. The beams, girders, and slabs are continuous. The 



FIG. 66. 



girders form intermediate supports for the beams, and the col- 

 umns for the girders. The beam BB, for example, is supported 

 by the girder CC, between the points a and b. Fig. 67 shows a 

 cross-section along the line hk, Fig. 66. The slab constitutes 

 part of the beams and girders, being built simultaneously with 

 them. However, for a slab to be considered a part of a beam in 

 10 135 



