详情

原文传递 FATIGUE TESTING OF DOUBLE-ANGLE CONNECTIONS OF STEEL RAILROAD BRIDGES.

题名：	FATIGUE TESTING OF DOUBLE-ANGLE CONNECTIONS OF STEEL RAILROAD BRIDGES.
作者：	Abouelmaaty-W; Maragakis-E; Itani-A; Douglas-B
关键词：	ADINA-COMPUTER-PROGRAM; BENDING-MOMENTS; CRACK-GROWTH-RATE; CRACK-PROPAGATION; CRACKING-; CYCLIC-TESTS; DOUBLE-ANGLE-CONNECTIONS; FATIGUE-MECHANICS; FATIGUE-TESTS; FINITE-ELEMENT-METHOD; FLEXURE-; GIRDER-BRIDGES; HISTORIC-BRIDGES; NEVADA-; RAILROAD-BRIDGES; REPEATED-LOADS; SHEAR-STRESS; SPECIMENS-; STEEL-
摘要：	An experimental study to evaluate the fatigue strength of double-angle connections used to connect stringers to floor beams in steel railroad bridges is described. The tests examined connections that could be used for either new construction or replacement of old, damaged connections. Double-angle connections are always assumed to be subjected only to shear stresses. But, in reality, some bending moment also is developed by this type of connection, causing additional flexural stresses, which, in turn, can produce fatigue damage by exceeding the constant amplitude fatigue limit. The amount of the transferred moment was estimated in the tests. Two full-scale specimens were built, representing the stringer-to-floor beam connection of a one-span, open-deck, through-plate girder bridge located in Nevada, typical of construction in the early 1900s. The specimens were tested under a cyclic loading of +/- 195.8 kN, representing the equivalent load, which produces a total maximum shear reaction at the connection equal to the one produced in the actual bridge. However, the load cycles were from 0 to 391.6 kN in real bridges. The specimens also were tested beyond the fatigue initiation to observe the crack-propagation patterns and their growth rate. The tested specimens were modeled by the finite element program ADINA, and a comparison between the analytical and experimental results was made.
总页数：	Transportation Research Record. 1999. (1688) pp46-52 (3 Phot., 9 Fig., 1 Tab., 12 Ref.)
报告类型：	科技报告