Flender/Flender Gear Units/Helical speed reduction gearbox H2
athing. If metal sheathing is used, it is supported by horizontal girts attached to the columns. The walls are generally

nonload-bearing, but must be strong enough to resist the lateral forces from wind or earthquake. However, whatever materialis selected for

covering, it should be weather-tight, corrosion-resistant, reproof, and eco-nomical. The design of single-storied buildings for lateral forces caused by wind

or earth- quake is not usually critical. However, provision of proper bracing system to resist these lateral forces is extremely

important. Lateral forces in both the transverse and thelongitudinal directions must be considered. To facilitate handling of materials, usually few walls and partitions within the build- ing are provided. Floor slabs are laid directly on the ground, and whenever special mechan- 2 Gupta and Bhattacharyya ical equipment is required, it is placed directly on special foundation to eliminate possible vibration of the structure caused by operating machinery. Crane ways in industrial buildings pose special design problems related to the crane columns. The stiffness of the portion of columns supporting the crane is usually increasedto carry the combined loads from crane and roof. The rigid-framed warehouse structures are mostly conventional linear developments of plane frames. rigid frame resists external loads essentially by virtue of bending mo-ments developed in the ends of members. Thus the connections in rigid frame musttransmit moment as well as thrust and shear. Several variations of plane frames are possi-ble. In general, rigid frames may be classied as single-storied or multistoried frames andsingle-span and multispan frames. For larger spans, open-web systems are adopted. It is beyond the scope of this chapter to give design principles and computational aids for all variations of plane frames. Widely accepted single-bay, pitched rigid frames are consid-ered for providing guidelines for analysis and design. However, for th