The application of pseudo-ductile cementitious composites in the anchorage zone of post-tensioned concrete members |
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Authors: | Christopher K Y Leung Xiufang Zhang Qinghui Xia |
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Affiliation: | (1) Department of Civil Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, People’s Republic of China |
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Abstract: | In China, fiber reinforced concrete (FRC) has been employed in practice for many years. In this paper, after a brief introduction
to the current status of FRC applications in China, we will focus on recent research related to the use of pseudo-ductile
cementitious composites (PDCC) to resist tensile splitting at the anchorage zone of post-tensioned concrete members. To simulate
the situation at the anchorage zone, rectangular concrete columns were loaded under concentrated compression. Tests were performed
on members made with (i) plain concrete, (ii) plain concrete and steel stirrups, as well as (iii) concrete with PDCC at the
anchorage zone. According to the test results, PDCC is effective in improving the ultimate load under concentrated compression
as long as failure is governed by tensile splitting. In some cases, it is found to be more effective than the steel stirrups.
However, when the PDCC compressive strength is much lower than that of the concrete, compressive crushing failure may occur
instead of tensile splitting, and the load capacity will then be decreased. For members that fail in splitting, a simple design
method is proposed and the predicted failure load provides a close estimate of the experimental value. Based on the present
study, the use of PDCC to replace all or part of the steel stirrups in the anchorage zone is proved to be feasible. |
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