# Cyclopedia of Architecture, Carpentry and Building: Strength of materials. Statics. Roof trusses. Hardware

American Technical Society, 1909 - Architecture
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Vol III

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Page 190 - Arm of a couple is the perpendicular distance between the lines of action of the two forces...
Page 3 - WILLIAM H. BIRKMIRE, CE Author of " Planning and Construction of High Office Buildings." "Architectural Iron and Steel, and Its Application in the Construction of Buildings,
Page 152 - The foregoing equations show that the rectangular component of a force along any line equals the product of the force and the cosine of the angle between the force and the line. They show also that the rectangular component of a force along its own line of action equals the force, and its rectangular component at right angles to the line of action equals zero. Examples. 1. A force of 120 pounds makes an angle of 22 degrees with the horizontal.
Page 133 - X 15,000 = 33,750 pounds. Since P. is the least of these three values, the strength of the joint depends on the shearing value of its rivets, and it equals 19,880 pounds. 2. Suppose that the plates described in the preceding example are joined by means of a butt joint (two cover-plates), and 12 rivets are used, being spaced as before. What is the safe tension which the joint can bear ? Here nt = 3, n2 = 12, and n2 — 6; hence, as in the preceding example, Pt = 31,500; and Pc = 33,750...
Page 130 - ... thickness of each is always made not less than one-half the thickness of the main plates, that is, the plates or bars that are joined. Sometimes butt joints are made with only one cover-plate; in such a, case the thickness of the cover-plate is made not less than that of the main plate. When wide bars or plates are riveted together, the rivets are placed in rows, always parallel to the " seam " and sometimes also perpendicular to the seam; but when we speak of a row of rivets, we mean a row parallel...
Page 56 - The line to which the distances are measured is called the inertia-axis / it may be taken anywhere in the plane of the area. In the subject of beams (where we have sometimes to compute the moment of inertia of the cross-section of a beam), the inertia-axis is taken through the center of gravity of the section and horizontal.
Page 110 - I-beam used as a column with flat ends, if the length is 17 feet and the factor of safety 5. Ans. 35,100 pounds. 87. Parabola-Euler Formulas. As better fitting the results of tests of the strength of columns of " ordinary lengths,
Page 115 - X 264' = 441,817.6. Hence d2 = 176.73, or d = 13.3 inches. 2. What size of cast-iron column is needed to sustain a load of 100,000 pounds with a factor of safety of 10, the length of the column being 14 feet ? We shall suppose that it has been decided to make the crosssection circular, and shall compute by Rankine's formula modified for cast-iron columns (equation 10'). The breaking load for the column would be 100,000 X 10 = 1,000,000 pounds.
Page 57 - handbooks" there can be found tables of moments of inertia of all the cross-sections of the kinds and sizes of rolled shapes made. The inertia-axes in those tables are always taken through the center of gravity of the section, and usually parallel to some edge of the section. Sometimes it is necessary to compute the moment of inertia of a "rolled section...
Page 23 - Bending test, 180 degrees flat on itself, without fracture on outside of bent portion. 10. Soft Steel. — Ultimate strength, 52,000 to 62,000 pounds per square inch. Elastic limit, not less than one-half the ultimate strength. Elongation, 25 per cent.