Tests of Large Bridge Columns

Tests of Large Bridge Columns

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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. 1918 edition. Excerpt: ...columns to a second order of approximation will now be discussed in the light of the preceding remarks. A portion of the observed compression data of column 32S (see Table 9) is first reproduced in the following Table 22 for the purpose of illustrating the method of calculation of the maximum stress from the data. The actual laws of variation of the stresses / and f-p will then be shown graphically for a number of the test columns in order to direct attention to the typical stress phenomena which are found for the whole series of columns. TABLE 22.--Illustrating the Calculation of Stresses / and f-p at Station 1 of Column 32S The increments of applied loads under the heading (a) are given in multiples of 4000 pounds per square inch, beginning with 1000 pounds per square inch as the assumed point of zero strain. The heading (6) gives the mean compression gQ on the axis at a particular load and is found by averaging the compressions given for stations 1 to 4 in Table 9. The corresponding axial strain is determined by dividing the mean compression under (6) by the gauge length of the extensometer. The axial stress under heading (c) is determined by multiplying the mean strain of (6) by the mean modulus E, here taken as 29 600 000 pounds per square inch as was previously calculated. Similarly, the compression observed at station 1 for the outer filament is recorded under (d). When the quantity (d) is multiplied by 29 600 000 and divided by 80 the fiber stress / is determined as is given under (e). The difference between the values for (e) and (c) gives f-p, the bending stress as recorded under (/). The last heading (g) shows the ideal variation of the stress / at station 1, in accordance with the law of proportionality of stress holding for a...show more

Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236798961
  • 9781236798961