Bulletin Volume 25-36 (Paperback)

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. 1908 edition. Excerpt: ...7 in. to left of left load. At 19 000 lb. a diagonal crack 4 in. high was noted 15 in. to right of right load. At 20 0(H) lb. the cracks were enlarging and at maximum load of 20 100 lb. a diagonal crack 6 in. high was noted 8 in. to right of right load. Load dropped to 11 300 lb. Beam No. 226.6. At 16 000 lb. diagonal crack 3 in. high marked (1) was noted, at 18000 lb. vertical crack along stirrup 5 in. high marked (2) and at 19 000 lb. the cracks marked (3) and (4). At 20 000 lb. diagonal crack marked (5) appeared and other cracks wereenlarging. At maximum, load 21 000 lb., vertical crack marked (6) was noted: diagonal cracks were lengthening. Load dropped to 14 000 lb. and diagonal crack (1) was opening. Failure by diagonal tension at left end. The stirrups were quite close to sides of beam and were wrapped in paper for the lower 4 inches. Beam No. 227.5. At 18 000 lb. small vertical cracks were noted 2 in. to right of right load, 4i in. to left of left load, and at first stirrup 2 in. to left of left load on further side of beam. The latter crack was 4 in. long. Failure crack started at bottom of second stirrup 7 in. to right of right load, ran up stirrup 24 in., then to first stirrup at a point 3 in. from top then upward along the stirrup. Maximum load 20 000 lb. Two stirrups were exposed at left end. Beam No. 227.6. Cracks were noted on both sides of beam at 15 000 lb. No cracks noted at left end of beam. Failure was rather sudden and was due to diagonal tension. Third and fourth stirrups from right end were found to have slipped or i in. The stirrups were not well embedded, especially at north end where failure occurred. Maximum load 16 400 lb. Beam No. 228.5. At 16 000 lb. a diagonal crack 5 in. high was noted 3 in. to left of left...