Structural Details, Or Elements of Design in Heavy Framing
Structural Details, Or Elements of Design in Heavy Framing
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161 Art. 37. Framing of Beams.
To ascertain the effects of bevels, notches, and mortises on the strength of beams, a series of tests of twelve forms of small wooden beams was made by William R. King in 1881, the results of which were published in the Report of the Chief of Engineers, U.S.A., 1883, page 1496. The span, form of beam, and manner of failure are shown in Fig. 37^. The beams were made of Tennessee poplar, and the timber was selected so as to secure a uniform quality. The breaking wei...ght, as given, is the average of two tests which generally differ less than 5 percent.
One of the most remarkable facts shown is that a beam may be greatly strengthened by cutting away certain portions so as to conform more nearly to a beam of uniform strength. Thus, beams 3, 5, and 8 when cut away to the form of beams 4, 6, and 7 become respectively 118, 134, and 32 percent stronger. The weakness of the forms, with shoulders near the supports, is mainly due to the great difference in stiffness on opposite sides of the shoulder and the resulting tendency to split, as indicated in the diagrams.
What to read after Structural Details, Or Elements of Design in Heavy Framing?
You can find similar books in the "Read Also" column, or choose other free books by Henry Sylvester Jacoby to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
161 Art. 37. Framing of Beams.
To ascertain the effects of bevels, notches, and mortises on the strength of beams, a series of tests of twelve forms of small wooden beams was made by William R. King in 1881, the results of which were published in the Report of the Chief of Engineers, U.S.A., 1883, page 1496. The span, form of beam, and manner of failure are shown in Fig. 37^. The beams were made of Tennessee poplar, and the timber was selected so as to secure a uniform quality. The breaking wei...ght, as given, is the average of two tests which generally differ less than 5 percent.
One of the most remarkable facts shown is that a beam may be greatly strengthened by cutting away certain portions so as to conform more nearly to a beam of uniform strength. Thus, beams 3, 5, and 8 when cut away to the form of beams 4, 6, and 7 become respectively 118, 134, and 32 percent stronger. The weakness of the forms, with shoulders near the supports, is mainly due to the great difference in stiffness on opposite sides of the shoulder and the resulting tendency to split, as indicated in the diagrams.
What to read after Structural Details, Or Elements of Design in Heavy Framing?
You can find similar books in the "Read Also" column, or choose other free books by Henry Sylvester Jacoby to read onlineMoreLess
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