High-rise Steel Structure Building

The steel tensile, compressive, shear strength is relatively high, the steel structure members of the structure section is small, light self-weight. In general, the self-weight of high-rise reinforced concrete building is about 1.5-2.0T/m2, and the self-weight of high-rise building steel structure is less than 1 T/m2, even some office buildings are only 0.5-0.6 T/m2. The self-weight of the structure is light, which can reduce the transportation and lifting cost, so the foundation load is reduced accordingly, which can reduce the foundation cost, especially in the poor geological condition area. The characteristics are more prominent.

Tteel structure has better ductility, good seismic performance, especially in high intensity seismic zone, the use of steel structure is more favorable, reinforced concrete structure ductility is guaranteed by the structure is not too high stress, while the ductility of steel structure is to make part of the members into plasticity.
In the high intensity seismic zone, there are requirements for the prevention of high-rise buildings, if the weight of the steam equipment is reduced by half, which is equivalent to reducing the seismic protection degree of one degree. Take Beijing 8 ° seismic crack prevention degree as an example, medium height building using steel structure weight reduction by 1/3, seismic action can be reduced by 30-40%, the load per unit area on the foundation can also be reduced by more than 25%.

The structure occupies an area (or called the structure plane density) is small, in fact, it increases the use of area. Steel structure building steel structure occupies only 28% of the structural area of similar reinforced concrete building area. The use of steel structure can increase the use area by 4%-8%, which actually increases the use value of the building and increases the economic benefits. For example, Beijing's Changfu Palace Center (26-story pure steel frame system) uses steel structure, the steel column section is only 450*450mm, the number of layers and column network with its similar reinforced concrete structure, the column section is about 900*900mm. If calculated according to the increased use area of 4%, for a building of 50,000 square meters, it is equal to an increase of about 200 square meters of use area, the value of which is considerable.

Fast construction, using steel structures can provide larger space and more spacious construction work area for construction. The columns of the steel structure project generally take 3–4 layers as a construction section and are lifted at one time at the site, and the lifting of columns, installation of steel frames, pouring of reinforced concrete core, construction of combined floor coverings, etc. can be implemented in parallel three-dimensional crossover operations. There is time to install columns and frames in the upper part, while the lower part can carry out internal decoration and decorative works. Therefore, it can be put into use in advance under the conditions of ensuring technology, supply and management. The construction period of some domestic high-rise building steel structure projects is shown in Table 2, which shows that compared with reinforced concrete structure, the steel structure of 30–50 floors can shorten the construction period by about 8–12 months. With the development, application, experience and accumulation of steel structure of high-rise buildings, the construction speed can also be accelerated.

The quality of steel structure is easy to guarantee. Steel structure components are generally manufactured in the factory and just installed in place at the site, with high processing accuracy, labor saving and a more civilized site. It reduces the sand, stone and cement stacking site, and also reduces the wet work of formwork storage and transportation, prefabrication of on-site components and cast-in-place reinforced concrete, which has great advantages in downtown areas or dense residential areas.

The steel structure building in the use of the process of easy transformation, such as reinforcement, joint height, expand the floor and other divisions, changes are relatively easy, flexible. Some developed countries believe that steel structure is an environmentally friendly building, can be reused and reduce the exploitation of mineral resources.

Steel structure can be made into a large span, large space. Large open-plan office, after the 60s has been a large development, some countries called "gardening office". This kind of office should be less Brahmin for the larger size of the column network arrangement, and the smaller the column cross-section, the more appropriate. The use of 12-15M column network has been very common. Steel structure is suitable for this requirement, because he can form a more spacious column-free space, easy to internal flexible arrangement.

Convenient arrangement of pipelines. In the structural space of the steel structure, there are many holes and cavities, and the web of the steel beam also allows the crossing of small calamities more than a certain diameter of the pipeline, which makes the arrangement of the pipeline more convenient and also increases the net height of the building, and the replacement and repair of the pipeline are convenient.

Due to the superiority of the steel structure itself, the steel structure building can be a green building, steel structure itself is a green and environmentally friendly products, has received strong support from the government authorities and national policy support.