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A Graphical Method for Swing-Bridges; A Rational and Easy Graphical Analysis of the Stresses in Ordinary Swing-Bridges

A Graphical Method for Swing-Bridges; A Rational and Easy Graphical Analysis of the Stresses in Ordinary Swing-Bridges


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: lines which represent the original forces in magnitude and direction, to follow each other consecutively end to end, as the sides of a rectilinear polygon; the remaining side to complete the polygon drawn to the starting-point will represent the force sought. Note.?This is true in whatever order the forces are taken, but it is usually best to take them in regular order passing in either direction around the point. This practice will generally give the plainest figure nnd avoid confusion from crossing of lines. 4. If all the forces which meet at a point are known except two and the directions of those are known, their magnitudes can be found by first drawing the lines representing the known forces, then completing the polygon by drawing those rspresenting the unknown forces in their proper directions. This is really the statement of a conclusion rather than a principle; two forces of known directions and unknown magnitudes are determined by substan.tially the same treatment as one force of which the magnitude and direction are both unknown; each case contains two unknown quantities, which may be determined from a figure having two dimensions, i.e., length and breadth?a plane figure. It is, however, stated as a principle, as it applies with especial value to the determination of the stresses in the members of bridge-trusses and similar structures having a singie system of bracing. Each force or stress is considered to act in a straight line between the centres of the connections of each member, and hence its direction is known. It will be attempted to illustrate the foregoing principles sufficiently to give a clear understanding of them. Let a-b and b-c (Fig. la) represent two forces which meet at a common point; their magnitudes are represented by the respective leng...


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Product Details
  • ISBN-13: 9780217666695
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 22
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 0217666698
  • Publisher Date: 02 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 59 gr


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A Graphical Method for Swing-Bridges; A Rational and Easy Graphical Analysis of the Stresses in Ordinary Swing-Bridges
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