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ÎÒÊÖÉÏÓÐÒ»·ÝÅfµÄÒŽ¹  (Ó¢Îİæ) ACI 209R-92ÒŽ¹  Prediction of Creep, Shrinkage,and Temperature Effects in Concrete Structures

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2Â¥: Originally posted by Óñ³ÕɽÈË at 2012-06-12 13:36:29
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alexkoko: ½ð±Ò+1, ¹ÄÀøÐ³淢Ìû£¬³£À´ÍÁľ°æ¿é½»Á÷ 2012-06-12 22:16:17
wyj0122: ½ð±Ò+5, ÔٴθÐл 2012-06-13 09:45:40
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Shrinkage and Temperature Reinforcement Requirements in ACI 318-02

7.12.1 ¡ª Reinforcement for shrinkage and temperature stresses normal to flexural reinforcement shall be provided in structural slabs where the flexural reinforcement extends in one direction only.
7.12.1.1 ¡ª Shrinkage and temperature reinforcement shall be provided in accordance with either 7.12.2 or 7.12.3.
7.12.1.2 ¡ª Where shrinkage and temperature movements are significantly restrained, the requirements of 8.2.4 and 9.2.3 shall be considered.
7.12.2¡ª Deformed reinforcement conforming to 3.5.3 used for shrinkage and temperature reinforcement shall be provided in accordance with the following:
7.12.2.1 ¡ª Area of shrinkage and temperature reinforcement shall provide at least the following ratios of reinforcement area to gross concrete area, but not less than 0.0014:
(a) Slabs where Grade 40 or 50 deformed bars are used: 0.0020
(b) Slabs where Grade 60 deformed bars or welded-wire fabric (plain or deformed) are used: 0.0018
(c) Slabs where reinforcement with yield stress exceeding 60,000 psi measured at a yield strain of 0.35 percent is used: (0.0018 ¡Á 60,000)/ƒy
7.12.2.2 ¡ª Shrinkage and temperature reinforcement shall be spaced not farther apart than five times the slab thickness, nor farther apart than 18 in.
7.12.2.3 ¡ª At all sections where required, reinforcement for shrinkage and temperature reinforcement shall develop the specified yield strength fy in tension in accordance with Chapter 12.
5Â¥2012-06-12 13:56:19
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