The ultimate strength and behavior of high-strength concrete prestressed composite I-beams
Abstract
This experimental investigation deals with the evaluation of the ultimate behavior of AASHTO I-beams with concrete strengths up to 9000 psi. The relevant 1983 and 1979 Interim AASHTO Specifications are thoroughly evaluated based on the results of this research. The findings of this study remark the many beneficial implications of the use of higher strength concrete in precast prestressed AASHTO I-beams. The increased concrete tensile and compressive strength is helpful in the service load design of these members. Furthermore, the inherent relationship between higher strength concrete and higher quality concrete should result in an improved long-term performance under service loads. The truss model approach is used to analyze the behavior of the test girders at ultimate. This study also points out the increased importance of adequate detailing of higher strength concrete members to insure ductile behavior under ultimate load. The results of this experimental evaluation indicated that with the current detailing of end regions, the formation of a web shear crack near the simply supported end leads to a sudden strand anchorage failure.
Degree
Ph.D.
Advisors
Ramirez, Purdue University.
Subject Area
Civil engineering
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