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:583
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.