What are the characteristics of the large-span steel structure

What are the characteristics of large-span steel structure In the past thirty years, many types of large-span steel structure in foreign countries, Japan, Europe, Canada and other comparatively developed countries and territories have developed rapidly, their spans and operation scales are getting bigger and bigger, the use of new materials and new technology applications are getting more and more common, and the structural forms are getting more and more colorful and varied. Many grand and quite characteristic large-span engineering buildings have been turned into local representative or representative of the natural landscape. Throughout the design and engineering construction of such contemporary large-span steel structure, the main features shown are as follows.

First, the structural form is becoming more and more diversified and complex

Contemporary large-span steel structure has long been not limited to the use of traditional single structural form, new structural forms and a variety of structural forms are emerging.

Second, the structure of large span, stainless steel plate level is high, stainless steel thickness is thick

Because of the necessity of the building function, the contemporary steel structure span is getting bigger and bigger, and the short direction span is over one hundred meters has been common, such as the national stadium Beijing Bird’s Nest span 296m, the national swimming management center span 174m, the Nanjing Olympic Center stadium arch span 360m and so on. So much so that the country beyond the authoritative experts to verify the Federation of professional codification of large-span structure over the limit of the requirements of the review. This large-span steel structure uses a lot of high toughness level stainless steel plate, such as Q390C, Q420C, Q460E, etc., and the thickness of stainless steel, some even exceed 100 millimeters.

Third, many contemporary technical applications of prestressing steel reinforcement

Prestressing steel reinforcement, as a new technical application, has gained sufficient use, and new structural forms, such as cable dome, prestressing overall structure and cable membrane structure, have continuously emerged. The badminton stadium of the Summer Olympic Games (Beijing Institute of Technology Stadium) adopted the string-supported dome structure with a large global span. The National Stadium adopts the double tension beam structure with a large global span.

Fourth, the connection point methods are complicated and diverse

Most contemporary steel structures adopt imitation green houses in order to consider the aesthetics of the buildings, and various connection point methods are adopted, such as cast steel connection point, forged steel connection point, ball-hinge connection point, etc. The steel structure is also used in the construction of the Beijing Olympic Games (Beijing University of Technology Stadium).

Fifth, the total number of components and cross-section type, the construction drawings design difficulty factor

Generally speaking, such large and medium-sized projects are composed of tens of thousands of components, and even more than 100,000 components, and the cross-section of such components are not the same way, specifications and length. That gives the construction enterprise construction sampling has produced a huge difficulty, and for some of the bending and twisting components, must carry out professional experiments and scientific research can be carried out.

Sixth, the component production and processing difficulty coefficient is large, the processing accuracy of the provisions of the high

These projects are attributed to the country’s top priority projects, engineering construction quality provisions of the high. Can only enhance the component processing accuracy, can consider the quality provisions. And a lot of welding provisions of the first level of welding, to the construction of the project has produced a huge coefficient of difficulty.

Seventh, on-the-spot welding and welding labor, high level of engineering and construction technology

In order to ensure the precision of engineering and construction, such projects must be carried out pre-assembly, and on-the-spot welding and welding labor is very large. Because of the new structure, span, in order to ensure economic development, safety, must use excellent construction technology can be successfully completed.

At this time, the advantages of space frame structure are reflected, most of the components are prefabricated in the factory, and there is no need to weld at the site, only the simple use of bolts for bolting. This greatly saves time and labor costs, and also reduces construction errors to a large extent.