| In recent years, the application of large-span spatial structure has been widely used. Many unique and complex structures of large span space buildings are being built in home and abroad. Because the stress of large span spatial structure in the whole construction process is very complex, the entire construction process numerical calculation, and the safety control of the construction process are very necessary. A gymnasium span, high clearance, modeling complex, in the construction process, there are some security risks, and it also needs analysis and calculation during its construction process. The steel roof structure is roughly a circular structure, splicing together by primary and secondary truss, below part of the central truss offers temporary support. In this paper, take the construction of the stadium steel roof structure for background, study the whole installation process and removal process of temporary support. The main contents and results on this graduate thesis are as follows:1. According to the actual construction process carry on finite element numerical calculation, the calculation results show that after removal of the temporary support steel roof, the maximum displacement value is-28.4 mm and the maximum Von Mises stress value is 81.7MPa of the steel roof; before and after removal of the temporary support, stress and structural deformation values were maintained within a safe range.2. On the key steel roof trusses at the same section of the winding and lower chord, analyze the displacement, study the characteristics and laws of stress in each truss, the results show that the symmetric position of the overall steel roof occurs on the center of truss, from both ends of the truss to central location shrink and twist, the roof's entire amount of twist, the east-west and north-south direction of the deformation volume is small.3. According to the results of the numerical calculations, making a detailed monitoring program, and monitoring data were analyzed throughout the construction process, the stress and displacement at measuring point change partially around the unloading of temporary support, most of the values in the respective directions are showed an increasing trend, the maximum stress is-62.3MPa, the maximum vertical deformation is-25 mm, and maintained in a stable range. The chord majorly influenced by compress stress, the webs is more complex, the compressive stress and tensile stress distribution is balanced, lower chord majorly influenced by tensile stress, temporary support suffer pressure throughout the construction process.4. The actual monitoring data and theoretical data were analyzed; the data are in good agreement.Through the study of the above, during the construction process, deformable structure is much smaller than the relevant regulatory requirements to allow deformation L/500(L = 67.2m), the actual maximum stress of the structure accounts for only 29% of the material strength design value(the strength design value of the Q235 steel is 215MPa). The results showed that steel roof stadium construction process is reasonable and effective, and the choice of numerical computation and real-time monitoring method is also scientific research methods and results can provide guidance and reference for similar engineering construction simulation and real-time monitoring. |
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