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[求助]
請教考慮混凝土收縮的裂縫控制規(guī)范
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在混凝土結(jié)構(gòu)中，混凝土收縮是引起開裂的重要原因，請問有哪些設(shè)計規(guī)范考慮了混凝土的收縮問題？ 因為我不是搞結(jié)構(gòu)的，在此先謝謝大家了。 |
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玉癡山人
木蟲 (正式寫手)
- 應(yīng)助: 39 (小學(xué)生)
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2樓2012-06-12 13:36:29
3樓2012-06-12 13:38:56
【答案】應(yīng)助回帖
★ ★ ★ ★ ★
感謝參與，應(yīng)助指數(shù) +1
wyj0122: 金幣+5, 謝謝啊。 2012-06-13 09:45:32
感謝參與，應(yīng)助指數(shù) +1
wyj0122: 金幣+5, 謝謝啊。 2012-06-13 09:45:32
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我手上有一份舊的規(guī)範(fàn) (英文版) ACI 209R-92規(guī)範(fàn) Prediction of Creep, Shrinkage,and Temperature Effects in Concrete Structures 若有須要 email chen@maeda.com.tw 回信地址 |
4樓2012-06-12 13:50:12
【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★
alexkoko: 金幣+1, 鼓勵新蟲發(fā)帖，常來土木版塊交流 2012-06-12 22:16:17
wyj0122: 金幣+5, 再次感謝 2012-06-13 09:45:40
alexkoko: 金幣+1, 鼓勵新蟲發(fā)帖，常來土木版塊交流 2012-06-12 22:16:17
wyj0122: 金幣+5, 再次感謝 2012-06-13 09:45:40
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不知道下面規(guī)范 是否算結(jié)構(gòu)方面是如何考慮的。 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. |
5樓2012-06-12 13:56:19
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