This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...working stresses rather than factors of safety. These working stresses are based, for the most part, on the permanent ...Read MoreThis historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...working stresses rather than factors of safety. These working stresses are based, for the most part, on the permanent elastic-limit strength of the material, although the, margin of safety between the elastic-limit and the ultimate strength (indicated by strength and ductility) receives consideration. The working stresses are made sufficiently below the elastic limit to provide for: (a) Variations and imperfections in material and work-manship. (6) Uncalculated stresses, such as secondary stresses, stresses due to unequal settlement, and, usually, those due to temperature changes. (c) Dynamic effect of live load if not provided for by an allowance for impact. (d) Possible increase in live load over that assumed, or rare applications of excessive loads. (e) Deterioration of the structure. The more accurately the various elements arc determined in any case the closer may the working stress approach the elastic limit. Where the dynamic effect of the live load does not enter, or is otherwise fully provided for, and where items id) and (e) are of small moment, working stresses for steel structures will vary from about one-half to two-thirds the elasticlimit strength of the material. Were it absolutely certain that 119. WORKING STRESSES AND FACTORS OF SAFETY. 167 the elastic limit of the material would never be exceeded in any emergency, then the margin of strength between the elastic limit and the ultimate strength would be of no importance. This is, however, not the case, and under actual conditions of service there is a very considerable element of safety in the fact that the ultimate strength is in most materials much higher than the elastic limit. Stated in another way, a designer would never use a working stress of one-half or...Read Less
Very Good. Third edition, 1919, hardcover, octavo, 485pp., illustrated with charts and graphs. Book VG with mild rubbing and wear to boards, binding tight, previous owner's signature and notes to front endpapers, text clean with some mild marginalia in pencil. No DJ.
Acceptable. Former Library book. Binding is slightly damaged and/or book has some loose pages. No missing pages. HARDCOVER, blue cloth, gold lettering on spine. Front inner hinge thinly cracked. Rear hinge, joints, and textblock all intact. Shipped to over one million happy customers. Your purchase benefits world literacy!
Copyright in bibliographic data and cover images is held by Nielsen Book Services Limited, Baker & Taylor, Inc., or by their respective licensors, or by the publishers, or by their respective licensors. For personal use only. All rights reserved. All rights in images of books or other publications are reserved by the original copyright holders.