Truss deflection is estimated by considering the truss as a beam. The deflection is composed of two portions. One is the bending deflection, which is determined as for a regular beam with moment of inertia evaluated from chord members. The other portion is the shear deflection, which is evaluated from the deformation of web members. The most remarkable feature of this approach is that no member stresses are required. The deflection is given by the direct calculation of simple formulas which already involve the properties of material and geometry. The examples given above, together with a good number of other studies, have shown that: 1) This approach requires very little time to attain an accurate result; 2) The results of this approach, compared with the results of either the unit-load method or computer analysis show an averaged error for all examples of less than 5%; 3) The accuracy of the result depends upon the span-depth ratio. The result is more accurate if the ratio is larger. In general, the error of this approach is less than 5% when the span-depth ratio is larger than 4.

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  • Corporate Authors:

    American Institute of Steel Construction

    101 Park Avenue
    New York, NY  United States  10017
  • Authors:
    • Brockenbrough, R L
    • Owens, D E
  • Publication Date: 1976

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 68-75
  • Serial:
    • Engineering Journal
    • Volume: 13
    • Issue Number: 3
    • Publisher: American Institute of Steel Construction
    • ISSN: 0013-8029

Subject/Index Terms

Filing Info

  • Accession Number: 00150433
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 27 1977 12:00AM