Recently, China Construction Steel Structure Co., Ltd. (CSC) conducted a residual stress test on the steel plate wall of the Tianjin 117 project. The test utilized an innovative three-dimensional stress magnetic measurement method to assess and eliminate residual stresses in the steel plate wall. This new technique marks a significant advancement in the field of structural engineering.
During the welding process, various types of stress such as thermal stress, phase transformation stress, and machining stress can exceed the material's yield limit. As a result, residual stresses remain in the welded component after cooling. These residual stresses are considered an unstable condition. When external forces are applied, the interaction between the applied load and the residual stress can lead to localized plastic deformation, causing redistribution of internal stresses. This can affect the accuracy of the manufactured components and reduce the overall stiffness of the structure. In summary, residual stress poses a potential safety risk to buildings. The key challenge for CSC’s experiment was analyzing and eliminating residual stress in the steel plate wall, which represents a breakthrough in steel structure construction.
The Tianjin 117 Building is one of the tallest structures in China, with 117 floors above ground and 3 underground levels. Its total height reaches 597 meters, and the total construction area spans 830,000 square meters. The building features a mega frame support system combined with a reinforced concrete core tube. Notably, the core tube is constructed using 70 mm thick steel plate shear walls, with welds extending up to 14 meters in length. The welding techniques used are among the most advanced in the country.
According to reports, Zhongjian Steel Structure places great emphasis on managing welding deformation and temperature differences during the welding process. They have conducted extensive research on residual stress within the steel plate walls and analyzed its distribution. By doing so, they have developed effective strategies to control and eliminate residual stress in large-scale steel structures. These findings have led to the creation of a set of practical guidelines for managing residual stress in steel plate wall welding across different construction units. The results of this study hold significant value for improving construction standards and enhancing competitiveness in large-scale bidding projects.
The research outcomes are designed to be technologically advanced, practical, and easy to implement, aiming to reach international standards. With these innovations, the CMC system is expected to gain a competitive edge in the market, supporting future large-scale infrastructure developments.
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