Proceedings of the Annual Convention 51 (1950)
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. . _ _ 1 2 3 4 5 6 1 2 3 4 5 12.0 27.7 29.9 31.1 31.1 32.9 28.4 31.1 28.4 33.9 33.9 1.53 1.71 1.74 1.70 1.70 1.70 0.69 0.69 0.65 0.69 0.69 12 14 11 11 11 7900 7800 7900 7600 16 14 16 12 Steel Avg. 12 13 13 7 13 13 Avg. 15 6400 7100 7300 7800 3 15 17 26 Avg. 12 Avg. 15 Static stresses and deflections used for above comparisons are given in Fig. 5.
Stresses are average for three gages located on bottom cover plates.
tially the same as observed for the steel. It appears from Table 2, summarizing ...the results of these tests, that the maximum stresses and deflections under moving loads averaged only 12 to IS percent more than the corresponding maximum static values.
The only records showing a significant variation from these average increases were those indicating stresses in the steel girder and here the measured strains were so small that a greater spread in ratios was not surprising. It is of interest to point out in connection with the relatively low impact effects observed in these tests that the maximum increase over the static live-load values assumed in the design of the aluminum girders was 55.5 percent.
What to read after Proceedings of the Annual Convention 51 (1950)?
You can find similar books in the "Read Also" column, or choose other free books by American Railway Engineering Association to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
. . _ _ 1 2 3 4 5 6 1 2 3 4 5 12.0 27.7 29.9 31.1 31.1 32.9 28.4 31.1 28.4 33.9 33.9 1.53 1.71 1.74 1.70 1.70 1.70 0.69 0.69 0.65 0.69 0.69 12 14 11 11 11 7900 7800 7900 7600 16 14 16 12 Steel Avg. 12 13 13 7 13 13 Avg. 15 6400 7100 7300 7800 3 15 17 26 Avg. 12 Avg. 15 Static stresses and deflections used for above comparisons are given in Fig. 5.
Stresses are average for three gages located on bottom cover plates.
tially the same as observed for the steel. It appears from Table 2, summarizing ...the results of these tests, that the maximum stresses and deflections under moving loads averaged only 12 to IS percent more than the corresponding maximum static values.
The only records showing a significant variation from these average increases were those indicating stresses in the steel girder and here the measured strains were so small that a greater spread in ratios was not surprising. It is of interest to point out in connection with the relatively low impact effects observed in these tests that the maximum increase over the static live-load values assumed in the design of the aluminum girders was 55.5 percent.
What to read after Proceedings of the Annual Convention 51 (1950)?
You can find similar books in the "Read Also" column, or choose other free books by American Railway Engineering Association to read onlineMoreLess
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