ON THE WEIGHT AND DESIGN OF A REDUNDANT TRUSS.
Abstract
The weight of a redundant, pin-jointed, planar truss of a given outline which supports alternative loadings is treated. The weight is regarded as a function of the relative areas of the members. It is difficult to obtain a clear understanding of this function if the truss has many members. However, for a three member truss, it is shown that the weight of all possible designs can be presented clearly as a single surface on a three dimensional graph. The effects of various strength criteria (entirely elastic, yielding with shakedown to elastic, and plastic without shakedown) are demonstrated by presenting appropriate surfaces on the same graph. The state of stress within the truss at proportions of low weight is discussed also. The concept of a fully-stressed or blaanced design in which each member attains its maximum allowable stress at some time during the loading history is sometimes useful, but not always attainable. Some diagrams are used to illustrate the effect of continuity requirements on the attainability of balanced design. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1962
- Accession Number
- AD0278293
Entities
People
- Robert J. Mayerjak
Organizations
- Air Force Research Laboratory