Report on Photoelastic Investigation of Stresses Surrounding Reinforced Rectangular Deck Openings

摘要

The study may be summed with the statement that a square opening in the center of a lone plate removing one-third the cross sectional area of the sheet reduces the strength to one-third of the original value. If the opening is reinforced by longitudinals and coaming plate, each of which has a cross sectional area equal to 0.4 of the cross sectional area of the opening, the strength of the plate with the opening is equal to 0.5, the strength of a plane sheet with longitudinals. The same opening reinforced with a suspension type doubler as shown in specimens 7 and 6 reduces the strength of the sheet to 0.8 and 0.7 respectively with and without the coaming plate and longitudinal support. Doublers of the same form which support the ends but not the sides of the openihg3, as shown in specimens 9 and 8, show a reduction in strength to 0.7 and 0.4 res¬pectively. Solid doublers of the same external outline, as shown by specimens 4, and 3, show reductions of strength to 0.7 and 0.6 respective-ly. A doubler of the same form as 6 but made of straight members, as shown in specimen 5, shows a reduction in strength to 0.6, the strength of the plane plate