Abstract
The concrete stress behavior and cause of cracking at the anchorage zones of top and bottom slabs of a post-tensioned prestressed concrete box beam were studied. Based on the complex stress distribution under local anchor problem for the Yichang Yangtze River Bridge, which is the longest continuous rigid frame arch railway bridge in the world, model tests were conducted. Two full-scale specimens of top and bottom slabs were fabricated and gradually loaded based on principle of equivalent stress. The goal was to analyze the longitudinal and transverse stress distributions of cross sections of specimens at various loading cases during the experiment. From the experimental results, it can be concluded that the mechanical behavior of the concrete and steel bars were in good agreement when prestressed tendons were loaded. Tensile stress of concrete in prestressed anchorage zone gradually increased and surpassed the ultimate tensile strength of concrete with the increasing load. Consequently, local longitudinal cracking was formed at the anchorage block. Some recommendations to avoid the concrete at the anchorage zone continuing to crack are summarized in this paper.
Highlights
Post-tensioning techniques have been widely applied to design bridge piers and decks, building slabs, and long-span girders [1]
Load transfer and stress distribution is very complex in this zone is defined as shown in sections, stress concentration is more serious in the mid-span because of comparatively thinner top and bottom slabs
For the eight loading cases, the top layer and bottom layer steel bars at Sections B-B were under the tension and compression conditions, respectively, due to the eccentricity of the prestressing tendons
Summary
Post-tensioning techniques have been widely applied to design bridge piers and decks, building slabs, and long-span girders [1]. Yong et al [12] carried out a specimen test and 3-D finite-element analysis to study transverse shear force effects on the stress and strain distributions of post-tensioned, rectangular, concrete anchorage blocks. Ultimate capacity, simulation analysis, etc., there are limited studies on stress transfer and distribution of the anchorage zone of post-tensioned prestressed concrete members, in particular, addition, compared with other stress concentration is moremembers, serious in in particular, the mid-span distribution of the anchorage zonesections, of post-tensioned prestressed concrete with with fullof scale specimens being applied inbottom tests. The primary objectives of this study detailed local stress distributions of(a)the post-tensioned prestressed anchorage zones(b) in continuous rigid frame arch railway bridge.
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