The general types of steel structure
     Normally the steel structure have frame, plane truss, grid (shell), cable film, light steel, tower mast and other structural forms.

     Its theory and technology are mostly mature. There are some problems are not resolved as well, or there is no simple and practical design methods, such as the stability of the reticulated shell. When the structural chooseion, should consider the characteristics of different structural forms. In industrial plants, when there is a large suspension load or a wide range of mobile load, you can consider giving up portal frame and use grid frame. Big snow area, the roof curve should be conducive to snow slipping (tangent 50 degrees without considering the snow load), such as Yadong Cement plant limestone warehouse with three-core reticulated shell, the total snow load and slope roof Released nearly half. Large areas of rainfall are similar. When the building permits, the arrangement of the support in the frame will be better than the simple node just frame. The roof covered with a larger span of the building, you can choose the main component of the suspension or cable system structure. High-rise steel structure design, often using steel concrete composite structure, in the high seismic intensity or very irregular high-level, should not simply for the economy to choose the core of the anti-seismic core tube plus frame. Should choose the surrounding giant SRC column, the core structure of the framework to support the framework. China’s more than half of such high-level for the former, against the earthquake. The layout of the structure depends on the characteristics of the system, the distribution of the load and the nature, etc. Generally speaking, it is said that the stiffness is uniform and the mechanical model is as clear as possible to limit the influence of large load or moving load to the most direct line The distribution of the anti-side support in the column should be evenly distributed, and the centroid should be as close as possible to the lateral force (wind and vibration), otherwise the structural twist should be considered.There should be a multi- Structure, the column should be able to withstand at least the total horizontal force of 1/4. The frame structure of the floor plane beam arrangement, and sometimes can adjust its load transfer direction to meet different requirements. Usually in order to reduce the cross-section along the short arrangement of secondary beams, but this will increase the main beam cross-section, reducing the floor height, the top side of the column is sometimes too much, then the secondary beam support in the shorter main beam can Sacrificed second beam to keep the main beam and pillar.