PART IV. 



MISCELLANEOUS STRUCTURED 



The descriptions of the different structures given in this part have 

 been abstracted from descriptions published in the Engineering News, 

 Engineering Record, etc. Figs. 171 and 172 are from the Railroad 

 Gazette; and Fig. 169 and Figs. 172 to 181, inclusive, are reproduced 

 from originals kindly loaned by the Engineering News. 



STEEL DOME FOR THE WEST BADEN, IND., HOTEL.* 



The dome of the new hotel at West Baden, Ind., is remarkable for 

 its size. This dome has a steel framework and is larger than any other 

 ever built, its span exceeding by about 15 feet that of the Horticultural 

 Building of the Chicago Exposition of 1893. 



The dome is about 200 feet in outside diameter and rises about 50 

 feet above the bed plates. Its frame consists of 24 steel ribs, all con- 

 nected at the center or crown to a circular plate drum, and tied together 

 at the bottom by a circular plate girder tie. Each rib foots at its out- 

 side end on a built up steel shoe, resting on a masonry pier. The rib 

 is connected to the shoe by a steel pin, and the outside plate girder toe 

 is attached to the gusset plate at this point, just above the shoe. The 

 shoes of all the girders are constructed as expansion bearings, being 

 provided with rollers in the usual manner. 



The dome is therefore virtually an aggregation of two-hinged 

 arches with the drum at the center forming their common connection. 

 Their thrust at the foot goes into the circular tie-girder, and only ver- 

 tical loads (and wind loads) come upon the shoes and the bearing piers. 

 At the same time any temperature stresses are avoided, since the ex- 

 pansion rollers under the shoes permit a uniform outward motion of 

 the lower ends of all the ribs. 



The outline of the dome and part of the dome framing are shown 



"Engineering News, Sept, 4, 1902. 



