Stress Analysis And Safety Monitoring During The Great Cross Unload Steel

In recent years, with the development of the construction industry, large span steel structure, with its beautiful shape and good economy. However, the complexity of large span steel construction and construction phase loads and loads a big gap between the design stage, especially in the larger structure unloading stage the risk of damage and destruction. Currently the construction phase theory is not perfect, the security structure in the construction phase is not easy to protect, and therefore stress analysis through the construction process and construction monitoring, research-span steel mechanical properties.In this paper, the properties of large span steel structure construction analysis and safety monitoring of key technologies, with the finite element analysis software, combined with the need to start construction safety-related research, the main research contents and results of the paper are as follows:(1) Sports Center swimming pool in the Ordos project basis, based on their actual uninstall process, using the finite element software MIDAS/Gen, using the equivalent rod end displacement method for simulation analysis of its uninstall process. Through simulation data shows that the uninstall program does not cause significant structural vibration and internal forces and displacements mutations, structural damage, is a reasonable way to uninstall.(2) Obtained by simulating the various stages of the upper structure unloaded deflection and stress, and the data is analyzed with results throughout the unloading process, the upper structure of the force to meet the strength and stiffness requirements, but the overall stress of the structure is relatively small, cross-sectional choice too conservative, poor economy.(3) According to finite element analysis results, combined with the characteristics of the roof truss structure, develop, including monitoring and deflection reasonable monitoring program. Using the static water level and the structure of FBG sensors monitor key parts of the structure obtained relevant data deflection, stress, comparative analysis of the uninstall process finite element simulation and actual monitored values found in addition to individual points, finite element simulation universal values greater than the actual value monitoring, two numerical deviation rate is controlled within15%, in line with the degree of good value.In this paper, finite element analysis and construction monitoring methods in engineering unloading stage, for a similar large span steel structure engineering unload construction provides important theoretical and practical significance.