Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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Downloaded From : www.EasyEngineering.netForms for Concrete Bridge Decks 441FIGURE 16-7 Deck forms supported by steel joists.ww.EasyEngineering.nAs illustrated in Figure 16-7, horizontal and diagonal bridging mustbe installed between adjacent joists to prevent transverse movements ofthe bottom chords of the joists, following the recommendations of theSteel Joist Institute. Horizontal bridging consists of two continuous horizontalsteel members, one attached to the top chord and the other to thebottom chord. Diagonal bridging consists of cross-bracing. The numberof rows of bridging depends on the joist designation and span length inaccordance with standards of the Steel Joist Institute.Because the joists will be reused several times on a given project,the bottom chords and possibly the top chords of several rows ofjoists should be interconnected by welding ¾-in. steel rods diagonallyacross and between adjacent joists. This will permit the interconnectedjoists to be lowered onto a truck-mounted traveler as a singleassembly and moved to a new location. The diagonal rods will preventracking during the handling and moving of the joists.Also, if ground conditions under a bridge permit the operation ofa truck equipped with a variable-height traveler, it is possible that anassembly of several interconnected steel joists, wood joists, and deckingcan be lowered intact onto the traveler and moved to a new location,which can produce considerable economy in formwork. If thisprocedure is to be followed, the wood joists should be cut to lengthsthat conform to the width of an assembly unit unless the forms for anentire bay will be moved as a unit.Table 16-1 provides allowable total safe loads for K-series steeljoists with allowable tensile stress of 30,000 lb per sq in. Dead loads,including joists, must be deducted to determine the load-carryingcapacity of joists. The values in the tables are pounds per linear footalong the joist. The component parts of the formwork should bedesigned as illustrated in the following example.Downloaded From : www.EasyEngineering.net
Downloaded From : www.EasyEngineering.net442Joist Type 20K4 20K5 20K6 20K7 22K5 22K6 22K7 24K5 24K6 24K7 24K8Depth in. 20 20 20 20 22 22 22 24 24 24 24Weight lb/ft 7.6 8.2 8.9 9.3 8.8 9.2 9.7 9.3 9.7 10.1 11.5Clear Span, ft20 550(550)550(550)550(550)550(550)——————————————21 550(520)550(520)550(520)550(520)——————————————22 514(461)550(490)550(490)550(490)550(548)550(548)550(548)————————23 469(402)529(451)550(468)550(518)550(518)550(518)550(518)————————24 430(353)485(396)528(430)550(448)536(483)550(495)550(495)550(495)550(544)550(544)550(544)www.EasyEngineering.net25 396(312)446(350)486(380)541(421)493(427)537(464)550(474)540(511)550(520)550(520)550(520)26 366(277)412(310)449(337)500(373)455(379)496(411)550(454)499(453)543(493)550(499)550(499)Downloaded From : www.EasyEngineering.net
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120 Chapter FiveExample 5-12Class I
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Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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