Edge 

 Distance 



13 



110. The minimum distance from the centre of any rivet hole to a sheared edge 

 shall be: 



\ inches for 1 inch rivets 



IK 



and to a rolled edge shall be: 



inches for 1 inch rivets 



Maximum 

 Diameter 

 of Rivets 



1 



The maximum distance from any edge shall be 8 times the thickness of the thinnest out- 

 side plate, but not more than 6 inches. 



111. The diameter of the rivets in any angle, channel, or beam, subject to calculated 

 stress, shall not exceed 1/4 of the width of the leg in which the rivets are to be driven. 

 In the minor parts: 



1 inch rivets may be used in 3X inch legs 



I/ It ti . . n II "2 " " 



Long Rivets 



Turned Bolts 

 Web Plates 



Strength of 

 Connections 



Compression 

 Splices 



Minimum 

 Connections 



Stringer 

 Connections 



112. Rivets subject to calculated stress and whose grip exceeds 4^ diameters shall 

 be increased in number at least 1 per cent, for each additional 1/16 inch of the grip. If 

 the grip exceeds 6 times the diameter of the rivet, specially designed rivets shall be used. 



113. Turned bolts may only be used in place of rivets by special permission of the 

 Engineer. 



114. Web plates of girders which have no top cover plates shall be set above and 

 trimmed flush with the tops of the top flange angles. Web plates of girders which have 

 top cover plates may be set not over 1/4 inch below the tops of top flange angles and also 

 not over 1/4 inch above the bottoms of the bottom flange angles. 



115. When web plates are spliced, not more than 1/4 inch clearance shall be allowed 

 between ends of adjoining plates. 



116. Tension members shall be connected or spliced for an axial stress equal to 

 their net sectional area, in square inches, multiplied by 16 000 pounds per square inch. 

 Compression members shall be connected for an axial stress equal to their gross sectional 

 area in square inches, multiplied by 12 500 pounds per square inch but not for a greater 

 stress than 50 per cent, above the maximum stress to be carried by the member. Truss 

 members subject to reversal of stress shall be connected for an axial stress equal to the 

 arithmetical sum of the maximum resultant axial stresses of both kinds. Lateral, longi- 

 tudinal and transverse bracing, when subject to reversal of stress, shall be connected for 

 the maximum value, whether in tension or compression. 



117. Compression members abutting on a pin shall have sufficient bearing thereon 

 to transmit the entire thrust without exceeding the allowable unit bearing. In riveted 

 structures, continuous compression members, such as chords and trestle posts, shall have 

 faced ends and full contact bearings at the joints when riveted. All joints in compression 

 members, where pins are not used, shall be spliced for an axial stress equal to the gross 

 sectional area of the smaller abutting member, in square inches, multiplied by 12 500 

 pounds per square inch. 



118. All connections and splices shall be, as nearly as practicable, symmetrical 

 about the axes of the members connected thereby. 



119. No member or component part thereof, except lattice bars or fillers, shall be 

 spliced or connected by fewer than 3 rivets. 



120. Connection angles shall be designed to carry the entire load, irrespective of 

 any shelf angles which may be provided to support stringers during erection. 



