The Design of Simple Roof-Trusses in Wood And Steel. With An Introduction to the Elements of Graphic Statics
The book The Design of Simple Roof-Trusses in Wood And Steel. With An Introduction to the Elements of Graphic Statics was written by author Howe, Malverd A. (Malverd Abijah), B. 1863 Here you can read free online of The Design of Simple Roof-Trusses in Wood And Steel. With An Introduction to the Elements of Graphic Statics book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Design of Simple Roof-Trusses in Wood And Steel. With An Introduction to the Elements of Graphic Statics a good or bad book?
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Two 3^" X 2i" XtV" angles have an area of 2 X 2.43 =4.86 square inches. Angles with 22" legs do not have as much bearing for purlins as those with longer legs, and sometimes are not as economical. In this case, two 4" X 3" Xt^b" angles having an area of 4.18 square inches will safely carry 34500 lbs., making a better and more economical combination than that tried above. This combination will be used. Thus far it has been assumed that the two angles act as one piece. Evidently this cannot be th...e case unless they are firmly connected. The least radius of gyration of a single angle is about a diagonal axis as shown in 98 ROOF-TRUSSES. Table XII, and for a 4" X 3" X A" angle its value is 0.65. If the unsupported length of a single angle is I, then in order that the single angle shall have the same strength as the combination above, — r- must equal = 9.4, or ' 0.65 ^ 1.27 ^ ^' / = 6'. I. Practice makes this, length not niore than f (6.1), or about 4 feet. Hence the angles will be rigidly con- nected by rivets every 4 feet.
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