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轻钢结构是一种年轻而极具生命力的钢结构体系

发表时间:2023-05-05 15:06

Light steel structure is a kind of young and vital steel structure system, which has been widely used in general industrial, agricultural, commercial and service buildings, such as office buildings, villas, warehouses, stadium, entertainment, tourist buildings and low-rise, multi-storey residential buildings, it can also be used in the areas where building materials are lacking, transportation inconvenient, construction period is tight, movable and removable building.

At present, the application of non-residential buildings in developed countries is very rapid, and is expanding to multi-storey residential buildings. Non-residential buildings mainly consist of light-weight steel portal structures with a span of more than 20m, which are widely used in the construction of large-span workshops for light industry, electronics, warehouse and processing, also has the application in the daily use supermarket, the temporary use room, the airplane hangar and so on. Light steel residential buildings are generally used for multi-storey (4 ~ 6 storeys) and height below 24m (7 ~ 9 storeys) high. By adding energy dissipation components such as energy dissipation braces, the residential light steel structure can also be used for higher floors. The frame structure composed of hot-rolled h-section steel is mostly used in light steel structure, the joints are connected by high-strength bolts (supplemented by welding) , and the floor slab is mainly made of profiled steel plate underlay instead of formwork, roof panels and external walls are usually made of color coated steel with heat preservation and waterproof, while household walls are usually made of waterproof and lightweight wallboards.


In 2016, China’s steel market prices in 2015 to reverse the downward trend, the overall upward trend maintained. In 2016, China’s steel composite index rose 80 per cent, starting at 57.42 at the start of the year and peaking at 103.4 in mid-december. According to the variety, the fluctuation of the plate is larger than that of the long. The price fluctuation range of hot-rolled coil (4.75 MMQ235B) is 94% , that of 8MMH300 is 76% , and that of thread steel is 79% . In 2016, there are five main factors influencing the price change of steel products: the macro-economy has stabilized and recovered, the funds are abundant, speculative capital is pushing up the price, the supply-side reform and the cost of raw materials and fuels is obviously higher.


In 2017, against the international backdrop of rising forces of globalization, the world economy was in a state of panic, risk levels were elevated and trade barriers were aggravated, economic growth will continue to bottom out, high-pressure inspection of production capacity and environmental protection will become the norm, and the intensity of mergers and reorganizations will only increase, not decrease, the raw fuel price cost supports the function obviously... above many advantages, the negative factor interweaves is influencing our country steel price trend in 2017.


Deepening capacity reduction and adjusting supply-demand relationship


Capacity reduction has become one of the key factors influencing the trend of steel prices in 2017. The central economic work conference held in December 2016 stressed that 2017 is the year to tackle overcapacity, that it is important to prevent the revival of excess capacity that has been eliminated, and that efforts should continue to be made to reduce excess capacity in the steel and coal sectors. The central government has made it clear that the elimination of backward production capacity, especially the thorough cleaning up of “Tiao Steel”, will be an important part of the work to eliminate backward production capacity in 2017. The State Council will also organize the special inspection and clearance of backward production capacity in steel and other industries; At the same time, it is clearly proposed to remove all “Bar steel”before June 30,2017, reflecting the central and local steel industry to “Bar steel”have adopted a “Zero tolerance”attitude. Short-term medium-frequency furnace enterprise to conduct a comprehensive surprise inspection of the steel market supply will have a certain impact, but in the long run, this move will curb the “Gresham’s law”phenomenon, making steel prices return to a reasonable range. In addition to the total elimination of “Ground bar steel”, about 50 million tons of production capacity to be reduced in 2017, the ratio of production capacity will be significantly increased, and the impact on the supply side of steel will be further evident, forming a steady upward thrust on steel prices.


Industry concentration increases price synergy effect will be highlighted


The Ministry of Industry and Information Technology (MIIT) has released the “13th five-year plan for adjustment and upgrading of the iron and steel industry (2016-2020)”, bringing forward five years to 2020 the time limit for the first 10 iron and steel enterpris


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