The Civil Engineer's Pocket-Book, of Mensuration, Trigonometry, Surveying, Hydraulics Etc. by Jr. John Cresson Trautwine
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...by the decimal.7854. Call the product 6. Divide g by b. Take the sq rt of the quotient. The shearing force and the shearing strength must both be in either lbs or tons. Or by a formula, Diam in ins =4 / Shearing force X coef of safety V' Ult shearing strength per sq inch X.7854 If the rivet is to be double-sheared, first mult only half the shearing force by the coef of safety. Then proceed as before. Or, near enough for practice, mult the diam in single shear by the decimal.7. The ultimate shearing unit for average rivet-iron may be taken at about 45000 ros, or 20.1 tons per sq inch of circular sheared section. Table of ultimate single shearing strength of rivets. (market sizes), in single shear; at 45000 lbs or 20.1 tons per sq inch. This table is not to be used when as in our "Example," Art 5, the crippling strength of the rivet governs the strength of the joint. If (he rivet is in double shear it will have twice the strength in the uiuio. For the diam in double shear to equal the strength in the table, mult the diam in the table by the decimal.7; near enough for practice; strictly, .707. The tensile strength of a properly proportioned joint is equally as either the sectional area of the net plate (not covers) across the centers of only one row of rivets j or as the shearing or the crippling (as the case may be) areas of all the rivets in a lap, or of all the rivets on one side of the joint-line in a butt. The tensile strength of fair quality of plate iron, before the rivet holes are made, averages about 45000 lbs, or 20.1 tons per sq inch; but we shall for safety assume, as stated in Art 2, that the making of the holes reduces the strength of the net iron that is left about one-seventh part, or to 38500 lbs, or 17.2 tons per sq inch. Item. Even ...
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