SLAB-BEAM-AND-GIRDER FLOOR SYSTEMS In this floor system, sholvn in Fig. 4-7, lhe slabs, beams and girders m cas1 at,he same time. A beam o. nd a girder ue similar in func:tion c,i:cepl that 11 gilder usually is larger and more heavily reinforced because it is designed ID suppon lhe IO&d lrom the beams dial li'amo into i L The beams around the ou,. ide ci!!ll'!' of the floor arc called spandrcl IH:m> or merely spandrds. ndrof (Edgo or E'xtor1or) Bo Rec:uingufar Extettor Column Fig. 47 Slab-Beam-and-Girder Floor System The bouorn or a slab, beam or girder is called a soffit. O,amf<r strips (bev­ eled edgea) are onen used in the fom,s to avoid sharp concrete edges 1b11t might tend to bre2k off. Tliecona'Ole for columns is usually ploud tos10pal lhcundcrsid coftbelow­ cstsupported beam orgi,d<.-rin the floor above. An intemil of several hours to a day or more is allowed for initial curcoftbe conctctc in the column berorc proceeding with placing the concrete in the floor. ONE-WAY JOIST FLOOR SYSTEMS The ODt>-way joist floor sysrein shown in Fig. 4-8 is,11pported b Y beams and onlunms. The. 6gun: also shows the use ofbolh rectangular exterior and round interior columns. Rein. forced concrete joist floor systems consist of a series of ribs, similar to small beains, wilh a lop slab, all of '"1lich.,.. pillced at one time wilh dw: supporting beams. The jois1sare usually formed b Y S1l!Ddan:1 invated meial oriibetglassfonns which fonn the side and soffit of adjacent joists and the bottom of Uie slab. The forms Plridr Q Relnhxoirl V 8'n-10!h Edition 4-5 Section 609 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 6-9