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Comparative Study on Autoclaved Aerated Concrete Slab Design in Chinese and European Codes
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摘要: 蒸压加气混凝土板作为一种轻质高强、保温隔热的构件,被广泛应用于多高层建筑围护结构中,研究此类板材的受力性能能够有效确保其结构的安全性。通过正截面承载力、斜截面承载力、抗弯刚度以及开裂荷载四个方面对中欧蒸压加气混凝土规范进行对比分析,结果表明:按照中国规范JGJ/T 17-2020的正截面承载力和斜截面承载力设计值与试验值相比,其误差比欧洲标准EN 12602:2016低,斜截面承载力主要与混凝土自身强度有关;正常使用极限状态下,中国规范中挠度和开裂荷载设计值存在1.5~2倍的安全储备,而欧洲标准考虑了钢筋的黏结性能、蒸压加气混凝土蠕变和收缩的影响,其理论值与试验值比值分别在0.71~1.02和0.78~1.06之间,拟合度较高,可作为该板材结构设计的依据。Abstract: As a kind of lightweight and high-strength member, autoclaved aerated concrete slabs have been widely used in multi-high-level building envelope structures, and the mechanical properties of such slabs can effectively ensure the structure safety. The codes of autoclaved aerated concrete in China and Europe were comparatively analyzed from the four aspects of the positive section bearing capacity, oblique cross-section bearing capacity, and the cracked load. The results showed that compared with the experimental values, the design valves of the bearing capacity of normal sechen and obliqhe section in JGJ/T 17-2020 had smaller error than those in EN 12602:2016, and the oblique section bearing capacity was mainly related to the strength of the concrete; under the limit state of normal use, the deflection and crack load has a safety reserve of 1.5 to 2 times the design value. The EN 12602:2016 considered the bonding properties of steel bars, autoclaved aerated concrete creep and contraction, and this kind of theoretical value ratio and test value ratio between 0.71 to 1.02 and 0.78 to 1.06, respectively, the degree of fit could be used as a basis for structure.
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Key words:
- autoclaved aerated concrete slab /
- bearing capacity /
- deflection /
- cracking load /
- structural design
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