Essay on the Theory and History of Cohesive Construction; Applied Especially to the Timbrel Vault

Essay on the Theory and History of Cohesive Construction; Applied Especially to the Timbrel Vault

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1893 edition. Excerpt: ...three courses, or say three inches in thickness, the moment for tension will be, one inch and a half, and for compression one inch and a half. (82) Suppose Fig. 34 to be an arch whose rise is a foot. The central axis will be X4 X5. The part below it, working by tension, will have six inches for its moment, and that above the same. All this part, worked by tension and compression, acts really as a second beam, taking part of the load off the iron beam. To Fig. 34. find the extra strength that this form of arch adds to the construction, of which it forms part, --as it depends upon the tensile strength of the material, which is 223 lbs. per square inch, --we can apply the following formula, represented by L = Load in pounds. S = Span in feet. /= Rise in feet. C = Coefficient 223 pounds breaking load. T = Surface area in square inches. 8 rC T S It can also be reinforced by means of a counter-arch turned over the beam, which arch will take part of the load of the floor and transfer it against the walls which are tied by the said beams, so that the beams will act in connection with this arch by tension. This disposition has the advantage of reducing the concreting, and in consequence the weight, over the haunches of the arch and beams. This will be the breaking load; the beam must be strong enough to add to the strength of the arch sufficiently, so that it can never work up to its breaking load. In any ceiling composed of barrel arches constructed on the cohesive principle of construction, supported between beams, the ends of the beams and the extremity ends of the barrel arch receive the principal load and in consequence the beams receive least weight in the middle. (83) Suppose Figures 35, 56 and 37 are barrel arches built over two beams, more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • United States
  • English
  • black & white illustrations
  • 1236957474
  • 9781236957474