.. CONTINUOUS BAR ON BAR aw RS C 3'-0-o. c. OR UPPER JOIST Cl-WR <r (. vi 4 ·. ()" 1-r. vl MAX C,.,AX) :r-O"o. c. ~1.. ('13) ~ SECTION A-A JOIST ELEVATION NOTES: l. ff ERJOCST Qt AIR ~ ALTERNATE SECTION A-A I, Har SIQIOf U fl. IC a,,::IICdll Y not pn:widcd for tcq,,mn. t!'Hh~ wetded WW'II ttln(o. ctmclllit or mofcn'ffl. g baff in ~.._ joist $!3M. It is reen,mn,cndt. d dm ~m J)Cl'. ltl. ft ti«rs be bed. Sid spsood with t O b3t S ceotercd on &111::rnate l'OW$ o( f~ i. e.. about 4 '..-2" ro 6'. fl" oo ccntcr at ri2i>t~to ~ ban. 2, Top~ ;iire n{lmwty "'l'l'°''ed tilht1 by ban oa iadividl W du, or by upper-joi11 Cha. US. J, Fbr n11>way joa11 comaucd(II!. (....nk. slubd).-bu,-tlff'()lt J in lh,11-itt one d!teetloe a!l 1~w:lbt be m~le the $,11Me at (Of otre,,wuy CO!ICRte joist ~on. Ba,. supports 1~-ot quiml ia the dbl..-n:k :iogks :as~ ba,s are SIJll C!Ortcd on me bottom b. m Mll'ling in the &st dircccioll. cu:cpc: COp ban in tbe middk $tripi; may need to be-.,ported Fig. 13-6 Bar Sul!l'Qll!l_ for Joists Ibe short bottom bar is placed on (he same chairs,. iongside :l:e straight long ~ Top lw are Iha, plaocd and cxlend<d the required dislllnee into tho adja­ cent SJl'II"I, nd where p0ssiblo. tied to top beam \>al$ or stirrup tie bars. The top bars are held in position by S-JPport ix!!!_(usua llx. 1/9) nd irul'vicl1. il bilr ch,i1rs (~milar to high cluu~ bul lim1tcxl tu I¾ mches ma. ximuin l·eight)l The bor chair. : rest on the top of i!ii)Ol>l orms. Thero are some cases wl,e,e the top slab is not thick enough, after allowing for O,e concreie cx,,er and the diam<lcr of Ibo top n:inforcina b. us, to provide space undernca!h for a,upport bar and bar chair. A special upper joist chair is then used which is supponoo on the joist form but bent down to suspend the bars in position. In some cases, especially for the two-way waffle slabs, some improvising may be necessary by the Detailer to show a suitable me:tns for this top,uppott. For example, it might be advisable for the support Im and bar chair to be used and lhe top reinforcing bars pic:la:d up and tied Wldt:mc,ilh the SUpp Ort bars by tie wires. See Fig. 13-7. Plamg Rolnlorclng 8'rs-101h Edition 13-7 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 6-9