CHAPTER 15 TRANSPORTATION STRUCTURES GENERAL Tran,;ponation slructures include bridges. box cul YC<1S, and smaller drainage structures. The mon: common types ofbridaes are the slab bri~, 1hc simple beam bridge, the rigid frame. the arch, and o,e bo, girder. The pi. acing of reinforcing_ steel io transpor-. ation ~t\lrcs is cry ~imilar to the procedures outlined for building con. urut:1!01b..&g\Jrc 15-1 ~OWll> rcm J ing bar> bcin&J)kccd in U!!i!lgc dock. Transporlalion str UCIUre S are usually inore massive due IO heavier loading and d-. eir exposure to a corrosive enviro~ mcnt might require a greater amount of concrete cover on the n:inforccme:nt. Fig. 1S-1 Erecting a Bridge Deck DRAWINGS In building construction, it is necessary for the various trades 10 work from architectura l, ~"tn. lcturalf mechanical, and placing drawings. Transporta tion stn1c1Ur CS are usually built from one set of drawings, because very few archi recrural and mechanica l features are in"'lvcd. Most state mmsportation de­ partments have standard drawings for their commonly used bridges, culvens, ond smaller drainage stroclurcs. Pio~ Reinforcing Baro-1011> Edition 15-1 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 6-9