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wyj0122

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[求助] 请教考虑混凝土收缩的裂缝控制规范

在混凝土结构中，混凝土收缩是引起开裂的重要原因，请问有哪些设计规范考虑了混凝土的收缩问题？
因为我不是搞结构的，在此先谢谢大家了。

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1楼 2012-06-12 10:28:02

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

hogichen

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【答案】应助回帖

★ ★ ★ ★ ★ ★
alexkoko: 金币+1, 鼓励新虫发帖，常来土木版块交流 2012-06-12 22:16:17
wyj0122: 金币+5, 再次感谢 2012-06-13 09:45:40

不知道下面规范是否算结构方面是如何考虑的。
Shrinkage and Temperature Reinforcement Requirements in ACI 318-02

7.12.1 — 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 — Shrinkage and temperature reinforcement shall be provided in accordance with either 7.12.2 or 7.12.3.
7.12.1.2 — Where shrinkage and temperature movements are significantly restrained, the requirements of 8.2.4 and 9.2.3 shall be considered.
7.12.2— 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 — 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 × 60,000)/ƒy
7.12.2.2 — 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 — 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.