The so-called prefabricated steel structure building is not about the fabricated steel structure, but the fabricated building with steel structure as the load-bearing structure

It is well known that the steel structure is not changed by welding in the factory

Therefore, the starting point of looking at the problem should be focused on the factory prefabrication degree and on-site installation efficiency of parts and components that constitute the whole building

It is not just the steel structure, which is the fundamental to realize the industrialization of construction

Prefabricated steel structure building is not a new thing in China, especially in the recent national policy level, the relevant policies have been implemented one after another

However, it is undeniable that the status quo seems to be quite different: on the one hand, prefabricated steel structure buildings are widely used in public buildings 

On the other hand, prefabricated steel structure building is rarely used in the residential area with huge market 

It’s hard to move.From the perspective of technology and economy, what is the problem

The following is a brief introduction and analysis.

1、 Is there a lack of technical standards?

There is a lack of standard for prefabricated steel structure buildings, which seems to hold many opinions

Even led to the recent state departments in the emergency organization to prepare relevant norms

In fact, the domestic steel structure related technical standards (including design and construction, acceptance, etc.) are not lack, and they play an important role in the promotion of steel structure public buildings 

For residential steel structure, there are two typical cases

First, the structural code does not support the conception and requirements of some residential building design

Second, some companies’ proprietary structure systems developed by themselves conflict with the existing norms, which need special demonstration

These situations exist, but they are not the decisive factors of restriction

At the same time, these problems will be gradually solved in the preparation and revision of the standards in the near future

Building envelope, interior decoration and mechanical and electrical parts of fabricated steel structure building to realize functions

Basically, there are relevant product standards, testing standards and application technical standards

Newly introduced and developed parts are also gradually preparing relevant standards

However, the quality acceptance of parts and components of fabricated steel structure 

A large part will involve the supervision of products produced by factories 

There are still some problems on how to implement it.

The current “industrial building evaluation standard” is mainly concrete structure

It does not reflect the advantages and characteristics of steel structure, and there are disputes on the assembly rate calculation of prefabricated steel structure buildings

This is a relatively concentrated issue.At present, this standard is under revision 

Therefore, generally speaking, it is not accurate to say that prefabricated steel structure buildings lack of standards

The current standard system is also gradually improving for the needs of prefabricated steel structure buildings

2、 Is the technical system mature?

The fabricated steel structure building is often faced with the following technical problems in the promotion process. 

1.Fire and corrosion resistance

It is generally considered that the fireproof and anti-corrosion performance of steel structure is not good, and coating is used for protection. The service life of coating is only about ten years, which is far from the design service life of buildings.Due to the different use conditions, public buildings allow later inspection and maintenance, so it is not much questioned.But the residential steel structure is basically impossible to carry on the related inspection and maintenance in the use period indoors, suddenly seems to become a fatal problem.This misunderstanding is widely spread even among technicians in the industry. 

In fact, the corrosion of residential steel structure in the normal indoor environment is extremely limited, even if the initial coating failure for a long time, the corrosion is also controllable, which will not affect the structural safety.The use of steel structure buildings built decades ago in the United States and Japan has fully illustrated these problems.Even, according to the experience of Japan, the current steel structure buildings are generally no longer subject to anti-corrosion coating.In addition, the fireproof problem of steel structure can also be treated by sticking fireproof sheet, which is more reliable than fireproof coating. 

Therefore, the fire prevention and anti-corrosion problem of prefabricated steel structure building does not exist much in technology, but is more a cognitive problem.

2.Living comfort

The comfort problem of steel structure public buildings is not prominent, most of which are criticized.This is often caused by the problems of building envelope components and construction technology.

In the past years, due to the problems of supporting resources and application technology of enclosure components, the selection of enclosure components is improper, or the technology is not mature, and the wall structure adopted by engineers is not appropriate, resulting in the problems of external wall cracks, seepage prevention, sound insulation, thermal insulation and so on. 

In fact, the prefabricated steel structure building can achieve the same living comfort as the concrete shear wall if the upper part is properly selected and the enclosure system is reasonable.With the gradual maturity of building envelope components and the progress of engineers’ technology, these problems are being effectively improved.

From the above review and analysis, we can basically judge 

At present, the policy orientation, cost and technology of prefabricated steel structure buildings have shown a favorable situation 

Prefabricated steel structure building has reached a turning point of vigorous development 

In addition to public buildings, in recent years, some units represented by Tianda, Baosteel, Hangxiao, etc 

Also in the prefabricated steel structure housing aspect carries on the corresponding technology research and development and the industrial layout 

The spring of industrial development has undoubtedly arrived