ガラス板の耐風圧試験

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タイトル別名
  • BREAKING TESTS OF GLASS PANELS BY A DYNAMICAL WIND LOAD TESTER
  • ガラスイタ ノ タイフウアツ シケン

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抄録

The resistance of large glass panels to wind pressure was studied by break down tests with oscillatory loading shown in Fig. 4 as examples. Glass panels tested were vertically and loosely supported as shown in Fig. 3, the nominal thickness of which ranged from 1.9 to 10.0mm of sheet or plate glass, and the height vs. width of which were 863×863, 1220×610, 1220×1220, 1725×863 and 1725×1725mm. For each size in each thickness, several lots, which consisted of from 9 to 20 sheets or plates in each lot, were tested to destruction. An apparatus used for the tests, schematic diagram of which is shown in Fig. 2, has the following characteristics, e.g. sufficient air pressure supply to destroy the windows resistible against the largest gust of typhoon, oscillatory loading corresponding to gust fluctuation both positive and negative, good controllability and stability, etc. Results of the tests were as follows. Average values of bursting loads, or total loads at failure, under the oscillatory loading were significantly larger than those under loading without oscillation as shown in Table 1. Bursting loads did not differ between on square and 2:1 rectangular panels, and were approximately independent of the areas in the range of from 0.75 to 3.0m^2 as shown in Fig. 5. A recommendation of allowable values based on the results of the tests was given as Table 3 and 4, and was approximated by Equation 1. The correspondences between the factor of safety and the probability of fructure shown in Table 2 were obtained independently of average value by the statistics on data transformed to logarithms.

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