In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Structural Performance and Bending Test of Deteriorated Reinforced Concrete Bridges
Author(s): Takeshi Oshiro and Sumio Hamada
Publication: Special Publication
Appears on pages(s): 39-58
Keywords: beams (supports); bend tests; bridges (structures);
corrosion; cracking (fracturing); deflection; deterioration; field
tests; performance; reinforced concrete; reinforcing steels; safety
factor; strains; strength
Abstract:Recently, significant deterioration of concrete surface and corrosion of reinforcing bars have been observed, and the necessity for the structural evaluation of such bridges becomes urgent for safety considerations. The primary objective of this study is to investigate the structural performance of two deteriorated reinforced concrete bridges and isolated test beams cut out of the same bridges at the time of replacement. Field and bending tests were conducted from which the strength of existing bridges and isolated beams was observed. Correlations of the values of strength obtained from these two tests give important data to be used for evaluation of existing deteriorated bridges. From the results of general investigations, field tests and bending tests, the following conclusions are drawn; (1) From the results of field tests of Nakama Bridge, strains of reinforcing bars and deflections are rather close to Theory II uncracked gross section), whereas those of Yaka Bridge are located between Theories I (cracked section) and II. This indicates the varying effects of deterioration on main beams. (2) Beams in bending tests yield larger strains and deflections compared with those from tests; this shows that the rigidity of a beam that is part of an existing bridge is much higher than that expected from an isolated beam. (3) According to general investigations, these two bridges were highly deteriorated in appearance. However, ultimate strength of test beams is higher than that computed by ACI Code, indicating no significant losses of strength.
Click here to become an online Journal subscriber