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What is difference between pre tension and post tension precast girders of bridge?
Wiki User
∙ 12y ago
A simple explanation:
PRE tensioned- cables are tensioned, and the concrete is cast around it. The tensioning is done BEFORE casting the concrete (PRE = before).
POST tensioned- cables are placed inside of ducts or are greased to prevent bonding to the concrete, the concrete is cast around the cables, and then the cables are tensioned after the concrete has reached a desired strength. The tensioning is done AFTER the concrete is cast (POST = after).
Wiki User
∙ 12y ago
civil xperts
civil xperts
In pre-tensioned girders, reinforcement is stressed with the help of a jack before pouring the concrete.
In post-tensioned girders, a duct is inserted into the concrete during the pouring, and after drying of the concrete the tendons or cables are inserted into the duct, and tension is provided from both ends.
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Locations of compression and tension in footing rebars?
Compression and tension occur in opposite side of the footing relative to position. So, at a spread ftg or pile cap, the top reinforcing will be in tension and the bottom compression. At the midspan, between spread ftgs or pile caps, the tension will occur in the bottom and compression in the top. Rebar lap splices usually occur in the compression points, so bottom lap at spread ftgs and top at midspans. Also, details will typical have additional rebar at the points of maximum tension so at the top over supports and bottom at midspans. This though should be confirmed with the Engineer of Record on any project, as assumptions can change project to project. But this is the general concept.
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[object Object]
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It creates dramatic tension.
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