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of /home/abouaayt/public_html/aboutcivil/answers/qa-plugin/user-management/layer.php why hook bars are used? - Civil Engineering Technical Questions Answers - Ask a Civil Engineer
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why hook bars are used?

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TO get sufficient anchorage.
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They were required to increase the bond strength between steel and concrete when the round bars were used. At present the deformed bars are used and the hooks are no more required at all for deformed bars.
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