The Research On The Mechanical Properties Of Steel Structure External Diagrid

Net shape tall twisted tube system as a new structural system, with beautiful architectural style, high structural reliability, functional and practical advantages. Outer cylinder and core tube bias mesh tube system as a new and efficient architecture, surrounded by a continuous two-way cross the outer surface of the building is constituted with Inclined Columns. The architecture of the mesh cylinder skew bear horizontal and vertical loads, with strong lateral stiffness. Skew grid structure system tube vertical beams and structural systems based on structure, the force receiving mechanism there are obvious differences.Thesis design and analysis of skew grid tube system performed an equivalent elastic methods to obtain the oblique grid tube system yielding sequence using SAP2000 software for analysis, obtained under medium / maximum positive earthquake situation sectional and shear stress ratio. The results show that the equivalent elastic cylinder skew grid to analyze results in the earthquake, the steel mesh tube(a small junior) member of its normal section in the earthquake does not meet the yield requirements in earthquake shear elasticity. In case of earthquake, steel mesh tube(a small junior) and member of its normal section Shear meet earthquake unyielding demands.Using modal response spectrum method to the entire mesh tube system stability analysis, the maximum force of the earthquake in different conditions in each column position, and on this basis, the mesh tube system in different loading, loads of different directions and shear force- deformation analysis. The results showed: Large mesh tube mainly bear vertical loads, under strong earthquake, vertical ultimate bearing capacity under a large cylinder is much larger than the actual bear vertical loads, the situation of instability and failure does not occur. Large mesh tube to withstand 2400 ~ 72000kN(in both directions) horizontal shear, vertical ultimate bearing capacity of the grid tube substantially unaffected. Small mesh tube main rod and secondary rod mutual influence, the same equivalent stability factor spine by the total capacity calculation and second vertical rod is 0.619. By strengthening its surrounding large-mesh tube openings connected member, strengthen small mesh tube surrounding the respective openings member, bottom member diagonally cross the times and the lever can be further improved ultimate bearing capacity of the mesh cylinder.