Large Spacing Of The Large Span Prestressed Intended Rib Type Roof Space Steel Grid Structure And Application

The pole network of structural engineering- building is layout by the function of building and process of technology, such as coal-shed of power plant, in order to facilitate the loading and unloading of coal need to train, two ends of gable wall opens wide, also like large-scale airplanehangar, these constructions request two gables to open wide, the span is big (l≥100m ) , it issupported by two opposite side, and the column net also requests in a big way ( a≥30 ) , Thusforms the structure system of great span, the big column network and two corresponding sides supporting. In view of this kind of structure system's request, this article proposed < the pre-stressed steel cellular texture similar to "rib-roof" >. Soon the plate wire table equivalent becomes " the board similar to sandwich panels " , the pre-stressed space tube girder construction supported by both sides equivalent becomes " the beam similar to sandwich panels " , it is similar to the rib-roof system which commonly used by reinforced concrete structure.This topic had been applied for the national monopoly, which comes from Ke-Jian MA's invention. First, this article draws out this topic from the development and the research present situation of structure of space steel grid, to explains the prospects for development and the research significance of this topic; and then to compare with the other different structural style, explains the benefits of shaping of this topic; next, though the endogenic force analysis from mechanics pre-stressed stage and load function stage aspect, to prove the pre-stressed steel cellular texture in the theoretical side rationality, Then, defines this structure with the finite element method each member, carries on the linearity and the misalignment theoretical analysis; Last, proves the fine economic and technologic norms through the example of this kind of new pre-stressed steel cellular texture. Distinction introduction structure structure composition, structure node, Then carries on the analysis contrast about 1/8, 1/11, 1/12 three kinds of different vector high ratio, to carry on the stress characteristics analysis separately to the top chord, the web member, the lower chord in the state condition, the load condition, the use condition three different condition, calculate the endogenic force of each member with MSTCAD, and then draw the steel volume of the structure and the most reasonable vector high ratio, makes the steel volume of this structure least, obtains the best economic efficiency. And displays the structure endogenic force characteristic of these three kinds of different vector high ratio intuitively by the massive illustrations and forms.