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The heavy truck frame design engineer is faced with many factors when selecting a frame siderail. These factors must be weighed if the siderail is for one truck for a special application, or for a family of frames for tens of thousands of trucks involving the entire spectrum of heavy truck usage. In this paper the various parameters of side bar selection are explored, and a lighter, less expensive design presented for higher gvw siderail applications.

The classical methods of deflection analysis are finding more application to complex automotive chassis frame structures. Much too time consuming for manual application, they are now coming into more widespread use with the aid of high-speed computers. This paper describes a computerized deflection analysis for complete truck frames under the cases of torsion and flexure. The rapid, accurate analysis permits investigation of more design problems resulting in the eventual production of more efficient frame structures.