PR1 I \< I 



by moving 

 treated in this book by the combined use of influence loss 



an.i algebraic methods. The infltience line is """tffr 1 by 



thi- in-atm.-nt \\ith tftblsj Q| DMMDSBl SJsd I id I 



new and entirely practical manner. 

 The heart of the text U contained in equation* (7) and 

 (8). These give an easy and exact solution of the maximum 

 I stresses in any structure whose influence Hoes can 

 be drawn, replacing, for the more complicated structures, 

 Mich a- .-r and swing bridge*, arches, etc., the old 



method of placing the wheel loading by trial and scaling 

 :ifluence-line ordinal** under the loads, 

 \ -eeontl feature of the text is the application of equations 

 (7) and (8) to the simpler structures, such as girder bridges 

 with and without panels), pier reactions, and Pratt trusses 

 with inclined and horizontal chords), in which these equa- 

 tion are tran-tWmr.i ami Mmph:i-l ' DMSJ '!. r.....- 



ments of these ordinary cases. This leads to a series of 

 Mmple formulas to meet the needs of everyday designing 

 T.> illustrate t)ie application of these formulas, fully worked- 

 out examples are given. 



The text is supplemented by a very complete set of 

 tables, the usefulness of which is at once apparent. The 

 greater part of the matter in these tables is new. A table 

 Mim. -va* made by Mr. Josiah Gibson, < I 



an-i pul.lMied in the I ngineering .Vw. June 21, 1005; and 



Ic similar to Table 1 1 w given by Mr. J 

 in the Htigineenng Neu* of ( M 1 1914. Tables similar to 

 TaUes 6, 8, and 9 are found in the " Structural rnsjiisjsjs* 

 Handbook " by Dean Mil- > Ketehuin and in the " Design 

 of Steel Bridges by M Kuni. 



