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article · 1992

THREE CASE HISTORIES OF CRACKING PROBLEMS ASSOCIATED WITH STEEL BRIDGE FLOOR BEAMS. FINAL REPORT

W H Walker, M. D. Holbrook, Patrick Cassity

Cited by 0Abstract and details only

Abstract

Floor system cracking problems, the focus of the present study, occur in both structures of recent construction and in older bridges which have been in service for many years. The present study has rises out of specific cases of floor system cracks which are not immediately detrimental to the structural integrity of the floor system and which do not at the outset seem related to a usual design basis load effects. The cases forming the central focus of this report are: (1) The I-474 Shade-Lohmann Bridge over the Illinois River south of Peoria, (2) The I-74 Bridge over the Vermilion River at Danville, and (3) The I-74 Bridge over the Sangamon near Mahomet in Champaign County. The following is seen: Case 1: Cracking due to forces not associated with vertical vehicle loading. That is, evidence is strong that cracking arises from longitudinal load transmitted through the out of plane flexure of the floor beam web in the segment between the connection clip angles and the flange at either end. Calculations show that a very modest induced longitudinal deformation is associated with substantial local stresses at the web to flange junction which is the site of the cracking. Case 2: Fatigue failure of a detail with adverse geometry but with forces induced by vehicle loads which clearly account for the damage. A repair detail to reduce member forces has been suggested and is evaluated. Case 3: The development of a fatigue crack at a cope detail associate with a reasonable stress state for the damage observed, but with poor correlation with a limited controlled vehicle test and predictions of bridge behavior using a grid model. Additional field studies with more extensive instrumentation and a more comprehensive analytical model is needed to resolve uncertainties in this case.

Cite this paper

APA 7

Walker, W. H., Holbrook, M. D., & Cassity, P. (1992). THREE CASE HISTORIES OF CRACKING PROBLEMS ASSOCIATED WITH STEEL BRIDGE FLOOR BEAMS. FINAL REPORT.

MLA 9

Walker, W H, et al. “THREE CASE HISTORIES OF CRACKING PROBLEMS ASSOCIATED WITH STEEL BRIDGE FLOOR BEAMS. FINAL REPORT.” 1992.

Chicago

Walker, W H, M. D. Holbrook, and Patrick Cassity. 1992. “THREE CASE HISTORIES OF CRACKING PROBLEMS ASSOCIATED WITH STEEL BRIDGE FLOOR BEAMS. FINAL REPORT.”

Harvard

Walker, W.H., Holbrook, M.D. and Cassity, P. (1992) ‘THREE CASE HISTORIES OF CRACKING PROBLEMS ASSOCIATED WITH STEEL BRIDGE FLOOR BEAMS. FINAL REPORT’.

BibTeX
@article{walker1992three,
  title = {{THREE CASE HISTORIES OF CRACKING PROBLEMS ASSOCIATED WITH STEEL BRIDGE FLOOR BEAMS. FINAL REPORT}},
  author = {Walker, W H and Holbrook, M. D. and Cassity, Patrick},
  year = {1992}
}

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