Recently, the research and application of prestressed construction technology of long-span space steel structure has passed the preliminary evaluation of the national science and technology progress award in 2010. The application of this technology solves the problem of the construction of large-span space steel structure to some extent, and plays an active role in the development and application of new technology in steel structure construction.

According to expert introduction at tsinghua university in Beijing, a steel structure, prestressed steel structure is the structure load before, after prestressing to adjust the structure internal force distribution, in order to give full play to the strength of materials or increase the stiffness of a steel structure. It relates to the research and application of prestressed construction technology, and has several construction techniques such as string truss, palm arch and inclined column style. The prestressed steel structure can improve the stress state of the structure and reduce the peak of internal force. The prestressing force can balance the load on the component, thus reducing the sectional area and saving the steel. At the same time, after applying the prestress, the steel structure can be fully utilized in the same component, and the elastic bearing capacity can be greatly improved. Prestressed steel structure has appeared in the 1950 s, in recent years, due to new materials such as high strength wire, fiber reinforced film and large-span space steel structure, prestressed steel structure is widely used. For example, zhengzhou xinzheng international airport terminal, which won the gold award of China construction steel structure. The steel structure of this terminal building adopts the structure system of curved box girder and space cable, which is novel and unique in design. The structure combines the rigid arch and the flexible cable to resist the external load, and is flexible and flexible. It has both the tensile properties of the high-strength cable and the bending capacity of the arch.

It is understood that the construction of prestressed steel structure has been applied in the 2010 Shanghai world expo project, such as the steel structure construction of the expo theme pavilion. The main structure of the roof of the main hall is a string truss structure and an ordinary steel truss structure, which is to carry out the construction of the prestressed cable truss of the span of 126 meters. In the construction, it is required to be uniform with the same step of the single truss, which is faced with the problem of non-plane arrangement of purline and cross bracing installation timing, adjacent long chord truss and so on. The construction of the project of the construction of the construction of the company and the southeast university before the construction of the application of the advanced software for the construction of a string truss structure scientific analysis, the simulation of the construction process, the analysis of a large number of data. Tensioning construction whole process analysis by finite element method, under different working conditions, the construction of tension in the cable and structure deformation, zhang in engineering construction of the truss string truss tensioning order, double line synchronous tension uniformity, mansard, each completed cable segment of cable, cable force monitoring key problems, such as to form the solution, and achieved the expected effect in the construction.

Expert says about steel structure, the prestressed large-span space steel structure construction technology research and application achievements, in theory, in line with the steel structure forming theory of merger and function, material concentration using, the prestressed tension system, set up and improve the shock resistance, such as the principle, to be advanced. In the practical application, it has reached the structure processing and quantization, component integration, construction and assembly. The components of the prestressed steel structure are manufactured and assembled in the factory, and the building blocks are assembled into parts or the whole. The roof of the house is installed in a single hoisting position for safe and rapid civilized construction. In the low-carbon environment, some new technologies are adopted, so that the construction materials can be fully and reasonably used, reduce the carbon emission, reduce the energy consumption, and have a good application prospect.