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合兴钢结构浅谈我国建筑钢结构的前景与差距

发布时间:2015-9-12 9:23:10 浏览次数:515
从美国、日本、欧洲一些发达国家的经验看,建筑业即将成为钢材应用的主要市场。而目前我国与之相比还有差距。因此我国的高层建筑钢材到目前为止还都从国外进口,特别是大于50mm;的厚钢板,国产产品的Z向性能尚达不到要求。国外不仅钢板厚度较大,而且可以满足各种性能要求。如日本已经能够生产的100mm的厚钢板,具有以下类型:
    ①有高强度低预热型(以前预热75℃,现在预热50℃)的厚钢板590N/mm2级(HT590级);
    ②抗地震的厚钢板,主要有低屈服比高强度钢材(HT590~HT780级)和低屈服点钢板,这种钢材日本重点生产,用于次要结构上,当地震时这种材料先屈服,保证主要结构减少地震损失;
    ③防火厚钢板。有400N/mm2及490N/mm2,当其在600℃时屈服强度还能达到常温下的2/3;
    ④装饰用的奥氏体不锈钢板及铁素体不锈钢板(沿海用,优于前者)。

    目前,国内高层钢结构钢材几乎都从国外进口,工程总承包由国外承担,制造和安装则由国内廉价劳动力承包,这种局面应从速扭转,因为这与我国产钢大国的地位很不相称。大跨度钢结构钢材不象高层钢结构那样突出,但设计方案(包括建筑和结构)经常国外中标,这种局面与中央强调建立我们自己的科技创新体系的号召相距甚远,应该引起我国建筑界的关注,是水平低还是其它原因,值得我们深思。



From the United States, Japan, Europe, some developed countries experience, the construction industry will become the main market of steel application. But by contrast and gap of our country at present. Therefore high-rise steel of our country so far are all imported from abroad, especially in more than 50 mm; The thick steel plate, Z to the performance of domestic products is still can not meet the requirements. Abroad not only the thickness of the steel plate is bigger, and can satisfy all kinds of performance requirements. Such as Japan has been able to produce 100 mm thick steel plate, with the following types:

A (1) type high strength and low preheating (now used to preheat to 75 ℃, preheating 50 ℃) of thick steel plate 590 n/was level (grade HT590);

(2) the earthquake resistance of thick steel plate, there are mainly low yield ratio and high strength steel (grade HT590 ~ HT780) and low yield point steel, the steel key production in Japan, for the secondary structure, when the earthquake the material yield first, ensure the main structure to reduce earthquake damage;

(3) fireproof plate steel. N / 400 n/was and 400 was, when the 600 ℃ yield strength can also reach two-thirds of normal temperature;

(4) decorative austenitic stainless steel and ferritic stainless steel plate (coastal use, better than the former).

At present, the domestic high-rise steel structure steel products imported from abroad, almost all engineering general contract shall be borne by the foreign, the manufacture and installation by the domestic cheap labor contract, this kind of situation should reverse quickly, because it is out of proportion to our product steel superpower status. Large span steel structure steel products do not like tall steel structure is outstanding, but the design (including buildings and structures) often abroad won the bid, the situation with the central emphasis on establishing our own scientific and technological innovation system call far, should arouse attention of architecture in our country, is a low level or other reasons, is worth us thinking.



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