. Détails des ponts de treillis ferroviaire rivetés . Pig.42. Dans cette conception est le piédestal qui se compose d'un disque. La plaque est rivetée au bas de la connexion et une membrane est rivetée dans la position indiquée par les angles en pointillés. La désignation de la connexion est bonne en ce qui concerne la borne d'extrémité et la cordelette d'extrémité. PIG.43 montre un détail commun utilisé par la compagnie AmericanBridge. Ceci approche la connexion rivetée directe de au début de cet article. Ce détail est très bon en ce que la tige d'extrémité et la corde inférieure sont rigidimaintenues ensemble par une plaque de gousset qui est rivetée aux deux

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. Details of riveted railroad truss bridges . Pig.42. in this design is the pedestal which consists of a disk. Aplate is riveted to the bottom of the connection and a diaphragmriveted in the position shown by the dotted angles. The designof the connection is good as far as the end post and bottomchord is concerned. Pig.43 shows a common detail used by the AmericanBridge Company. This approaches the direct riveted connectionspoken of in the beginning of this article. This detail isvery good in that the end post and bottom chord are rigidlyheld together by a gusset plate which is riveted to both. Thisis also good in that the gusset plate and end post extend farenough below the lower chord to make a clear connection for the -26- pedestal. A similar detail to this is used as a northernPacific Railroad standard. This is shown in Fig.44. The only. difference iDetween this and the former detail is that insteg, dof a pedestal connection being made with the gusset plate aseparate pedestal connection is riveted and bolted to the inter-section of the two. This has an advantage over Pig.43 in appear-ance if in nothing else. It is also a little simpler in con-struction hut perhaps a little more expensive. In all the details of the riveted bridges studied, there seemed to be an almost universal use of the gusset-plateconnection in preference to the direct connection. Hot a singledirect-connection detail was found. The probable reason for the plate connection is first, that more rivet area is required second than could otherwise be obtained, and^that the gusset-plateconnection confomed more nearly to the rest of the design. -27- In all of the plate connections, the general opinionof bridge companies and designers seems to be in favor of thepedestal being connected below the intersections of the centreof gravities of U-j^Lq and I^q-^I In th

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