Treatise on the Theory of the Construction of Bridges and RoofsJ. Wiley & Sons, 1876 - 249 σελίδες |
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Άλλες εκδόσεις - Προβολή όλων
Treatise on the Theory of the Construction of Bridges and Roofs ... De Volson Wood Πλήρης προβολή - 1880 |
Treatise on the Theory of the Construction of Bridges and Roofs ... De Volson Wood Πλήρης προβολή - 1873 |
Συχνά εμφανιζόμενοι όροι και φράσεις
angle arch assumed beam bridge cast iron centre coefficient component compression considered counter-braces cubic foot dead load deflection depth diagonals directly dome end brace equal weights equation exceed factor of safety feet forces formula gives H₁ hence horizontal inclined pieces joints king-post live load load extends lower chord main braces main rafters maximum strain maximum stress middle modulus n-th bay n-th pair number of bays one-half origin of moments P₁ p₂ panel system perpendicular posts preceding pressure rods roof secondary truss shown in Fig side span square foot square inch strains due stress on AC struts supported chord Suppose sustain tang tension tie rods tie-braces tons total load transmitted TRIANGULAR TRUSS TRUSSED BRIDGES uniform load uniformly distributed upper chord V₁ w₁ whole length wind zero
Δημοφιλή αποσπάσματα
Σελίδα 235 - If three forces acting at a point are in equilibrium they can be represented in magnitude and direction by the three sides of a triangle taken in order.
Σελίδα 169 - Bi the reaction at the point of support Ai. This is the equation of a parabola whose axis is vertical and whose vertex is over the middle of the truss. Remark. — The usual method of computing the strains upon the pieces of a truss is that of adding and subtracting for each consecutive piece, as shown in the previous methods for calculating strains. General formulas are used in connection with these methods...
Σελίδα 185 - The inclined pieces AC, and BC, Fig. 207, which support the roof are called rafters. When the roof is light, the roof boards DE are placed...
Σελίδα 191 - CIVIL roof above them, the force of the wind, the weight of snow when there is any, and in some cases certain local or concentrated loads, such as floors, machinery, and the like, which are suspended from the roof trusses. 691. The Weight of Snow. Freshly fallen snow weighs from five to twelve Ibs. per cubic foot, although snow which is saturated with water weighs much more.
Σελίδα 69 - ... the load on the footing. The purpose of the ribs and base is to resist the tendency to break, due to this uniformly distributed load on the footing. Failure would generally occur through the bending action of the portion of the base projecting beyond the box. The moment on this may be figured as for a beam fixed at one end and free at the other and loaded uniformly with the load per unit of bearing surface. Taking one rib and the base half way on each side between the next rib would give a section...
Σελίδα 26 - Pig. 151. \CHORO distinction is quite unnecessary in an analytical point of view, as will be seen hereafter, but it is so common in practice that it will not do to ignore it. A Main-Brace is a brace which inclines from the end of a truss towards the centre, as in Fig. 151. A Counter -Brace is one which inclines from the centre and towards the ends.
Σελίδα 133 - ... the number of terms in the series = .ZV^ First consider the coefficient of p. Making n — 1, 2, etc., in Eq. (146), and we have, the series, N (N - 1), (N - 1) (N - 2), (N - 2) ( N - 3), (N - 3) (jy- 4), etc.
Σελίδα 22 - If the length of the column is less than that given in the table, and more than four or five times its diameter, the strength is found by the following formula...
Σελίδα 185 - ABC is called a roof truss. 689. Roof Trusses have a great variety of forms, and differ greatly in the details of their construction. All the trusses which have been discussed in the preceding pages are suitable for this purpose in many cases. Some other forms are given in the following pages. 690.
Σελίδα 149 - ... links to be connected are of square section, or are of considerable thickness in proportion to their sectional area, this thickening of the eyes becomes unnecessary, as sufficient bearing surface is given without it. A rule, for the size of eyes, which has been much used, and which gives generally very good results, is to make the outside diameter of the eye equal to twice the diameter of the pin passed through it, and then to increase the thickness until the requisite sectional area is obtained.