he development of light steel

Since the 1990s, the development of China's steel building very quickly, and some representatives of the city's

iconic high-rise buildings built for the steel structure has opened a new chapter in the development of our country.

As the world's third-highest 88 floors, high 420m Jinmao Tower has been completed and is now operational. Allegedly

the world's first highly Pudong, Shanghai World Financial Center, 460m, 95 floors, the building area of ​​310,000 m2,

is now stepping up its construction. By foreign investment in Dalian, President Building, is stepping up its

preparation, a total of 95 floors, allegedly after the completion of its height will be among the highest in the

world.

The development of light steel structure is more is in full swing, especially in the construction of industrial

plants is more rapid. Substantial growth in the number of firms from steel manufacturing and construction can get a

glimpse, such as the Shanghai steel manufacturing and construction unit has increased from dozens to more than 400

development, only Shanghai Baosteel region there are nearly a hundred The home of the steel structure factory.

Excellent situation, how to capitalize on the trend, do a good job of design and construction quality, which is a

very urgent problem.


Light steel structure and its Scope

The so-called light steel structure constituted by the following steel: cold-formed steel structures; hot-rolled

light steel structure; welding or high frequency welding of light steel structure; lightweight steel tube structure;

siding thin welded combination of beams and welding structure constituted by a combination of column.


1. Scope

According to our current situation, this structure because of its expense obvious advantages, have been widely used

in the single-storey industrial plant a multilayered industrial plants, office buildings and high-rise buildings in

non-load-bearing components such as. Storey industrial factory, usually the main H-shaped steel, welded connection as

beams and columns, a C-shaped or Z-shaped light steel purlins, roof or floor system with pressure-type color steel

plate as the surface layer, the above concrete, steel sheeting can be used as reinforced, if necessary, can also be

matched with reinforced. Wall cladding can be applied to single-layer or sandwich inside the pressure plate, sandwich

plate can be filled with a variety of insulation layer.

2 main advantages

(1) The construction period is short: light steel biggest advantage is that all of the components can be produced by

a factory field splices installed in just 45 days to two months, generally smaller industrial plants, and the use of

reinforced concrete buildings will have to about 8 to 12 months.

(2) comprehensive economic benefit: due to the short construction period, can be put to use in advance, to obtain

investment returns in advance; using colorful color steel sheeting, beautiful, gorgeous, dynamic sense to improve the

surrounding environment; buildings light weight, under normal circumstances, do not need to do pile foundation, you

can save the investment; due polyphenylene hexene foam sandwich board or veneer plus cotton insulation measures,

insulation, thermal insulation, and every chapter to good effect. Color steel galvanized substrate surface with

silicone as processed by the two in addition to two bake better durability, cost has been lower than the current

market price, light steel reinforced concrete structure, when greater the span of the plant, its advantage is more

obvious, which is on which it is a big advantage in the competition.


(3) seismic performance: steel structure is a flexible structure, light weight, and thus can effectively reduce the

seismic response and disaster impact, highly conducive to the earthquake. China is a multi-the earthquake zone

countries, should be a lot to promote the use of steel structures, can greatly reduce the earthquake disaster, and

casualties in the earthquake zone construction. At present, Tianjin has officially launched the light steel structure

house.

(4) is appropriate demolition relocation: Once the owners had made site are not satisfied or unexpected changes in

the external environment, the entire building in a very short time the demolition, the loss is minimal, and all of

these reinforced concrete building with .

It is because of the many advantages of light steel, and with the recent fire safety, the continuous emergence of new

anti-corrosion products have to solve the shortcomings of poor light steel corrosion resistance makes it gained in

industrial plants as well as civilian facilities a wide range of applications.

Considerations in the choice of materials and design

Light steel structure as ordinary steel structure derivative structure, the basic computing theory and the latter is

basically the same. Details can be found in Shanghai standard DBJ08-68-97 "light steel design procedures and the

China Engineering Construction Standardization Association standard CECS102: 98" portal frame houses light steel

structure technical regulations, only emphasized several points:

Timber priority should be given to the "H"-shaped steel, it is subject to reasonable force, stitching, easy

processing. Q235 steel and low alloy steel of 16Mn, 15MnV or 15MnV steel load-bearing structure is appropriate, but

should pay attention to the Q235-A carbon content of the steel as the delivery conditions, weldability is no

assurance that it should not be used as a welded structure. For plate thickness greater than 25 mm beam flange

column, field welding of the beam-column joints should not be with Q235-BF, should try to use the Q235-B or Q235-Bb,

Q235-C should be chosen for a particularly important structure or Q235-D.