With the rapid development of China's economy, because of its unique advantages of steel has been widely applied to the building structure, but poor fire resistance is its fatal weakness. Recently, the Beijing Construction Engineering Research Institute developed "after fire damage identification and security steel key technology research" project passed the inspection, reached the international advanced level.
It is understood that the fire damaged the steel structure after demolition and reconstruction of the direct and indirect losses are difficult to assess with the figures, and the transformation of steel and reinforcement shall be based on an accurate assessment of safety. However, so far China is no technical standards for the fire detection and assessment of steel structures, norms, a large steel building fire safety assessment after relying on experts' experience, refer to the relevant identification techniques other structures in the field, after a fire steel the identification methods, restoration measures is relatively conservative, expected service life of steel is not enough scientific follow-up, resulting in a serious waste of money.
The project is the first to establish a steel structure damage identification method and extent of injury criterion after the fire, and made a quantitative assessment of the safety of the method of steel components after the fire by metallurgical analysis to determine the temperature of the method and fire filled the steel after fire blank structural damage identification and safety assessment. Research identified overall reached the international advanced level, some reached the international advanced level. Determination by a single member excesses temperature, mechanical performance analysis, performance analysis and chemical analysis of microscopic tissue damage identification, determine component damage levels, while the coefficient of each component is calculated based on the importance of quantitative assessment methods, and then derive the overall safety of the structure. Steel can be realized on the damaged condition after the fire, the structural safety of quantitative evaluation, its reinforcement to provide a scientific and reasonable reference.
In addition, the project developed based on the above evaluation method based on Android system after the fire steel surplus carrying capacity and damage assessment software which can be installed on Android smart phones, can be achieved at the fire scene on the data collected in real-time analysis , the remaining carrying capacity and injury status after the fire steel components for rapid assessment, on the one hand to improve the work efficiency, on the other hand can guide the technician to identify programs for timely adjustment and refinement, help to improve the accuracy of the assessment conclusions sex. Currently the software has made computer software copyrights.
So, how accurate steel structure after fire damage identification and safety assessment of the industry to become an urgent problem. To overcome this problem, the research team on the project after fire damage identification and security steel key technologies studied. The study is not only to achieve a quantum leap in technology, but also for the maintenance of public safety and made important contributions. At present, the results have been obtained in a number of practical engineering applications, and achieved considerable economic benefits, has been recognized by the industry and the community.
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