Engineering and Contracting . ering into the design (particularly in localities havingclimatic conditions such as obtain in the northern middlewest) render the selection of the depth of ring sectionand its method of varying from crown to spring line ofequal if not greater importance than that of the axialcurve. It is a fact well known to all designers that the mo-ments induced in a fixed arch by internal temperaturechanges will vary as the moment of inertia of the sec-tion and thus very nearly as the cube of the depth of sec-tion. (This relationship is absolutely true for plainsections and ver
Engineering and Contracting . ering into the design (particularly in localities havingclimatic conditions such as obtain in the northern middlewest) render the selection of the depth of ring sectionand its method of varying from crown to spring line ofequal if not greater importance than that of the axialcurve. It is a fact well known to all designers that the mo-ments induced in a fixed arch by internal temperaturechanges will vary as the moment of inertia of the sec-tion and thus very nearly as the cube of the depth of sec-tion. (This relationship is absolutely true for plainsections and very approximately so for reinforced sec- 93 tions.) The moment of resistance of these same as the second power of the depth of section(strictly true for plain and approximately so for rein-forced sections). Obviously then the fibre stress inducedby the above forces will vary almost directly as the depthof section. (This relationship is somewhat modified bythe direct stress, the effect of which is to increase the. oiB—^im \aii \tj6 \t^.MJilJi
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
