. Details of riveted railroad truss bridges . as forthe particular detail shown which consists of two pairs of anglesand lattice bars. There is little doubt but that this detail isthe best of any detail shown for the intersection of two diagonalsIt is neat and effective, easy to put together, and rigid. Thereis no trouble in getting enough room for rivets as the length ofthe plate can be varied to suit. -39- Art,8. Portal and Sway Bracinc Most of the details shown in the preceeding pages aremore or less uniform, but the details of the portal and swaybracing are far from uniform. In fact duplic
. Details of riveted railroad truss bridges . as forthe particular detail shown which consists of two pairs of anglesand lattice bars. There is little doubt but that this detail isthe best of any detail shown for the intersection of two diagonalsIt is neat and effective, easy to put together, and rigid. Thereis no trouble in getting enough room for rivets as the length ofthe plate can be varied to suit. -39- Art,8. Portal and Sway Bracinc Most of the details shown in the preceeding pages aremore or less uniform, but the details of the portal and swaybracing are far from uniform. In fact duplicate portals are rareinasmuch as the entire detail rests with the designer. The fastening of the two trusses together by means of aportal and sway bracing is an important detail. In the end postthis detail is especially difficult on account of the inclina,tionof that member. It is always desirable to fasten the portal tothe posts near if not at the centre of the side. To accomplishthis the connection is as shown in This can not always. be accomplished and the portal is sometimes riveted to the endpost by plates on the upper side of the post. This is objection-able on account of the twisting moment which is caused in the postSometimes the portal is connected only along the length of thepost and not fastened to the upper chord as shown in very heavy bridges the portal is sometimes built as deep as -40- the end post and is riveted to it by plates on both sides of thepost. This is a very good method as the. entire stress is evenlytransmitted to the end post. This method can only be used econ-omically in large bridges, on account of the large size of themembers required for connection. The problem of fastening the intermedia-te post and swaybracing is easier than that of the portal. The systems them-selves are similar to the portal but on account of the positionof the intermediate post and top chord a connection can aesilybe made. There is no reason why the sway br
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