| To the calculation of the steel strobe, there are two methods in the present steel strobe design standard: plane system method and three-dimensional system method. In the past, the plane system method is often used in the strobe structure computation, which may cause the computed result at many places bigger than the real result ,and at some essential spots to be smaller. Especially to the deep steel strobe, a structure which has strong three-dimensional effect and close relation between each component, besides, each component works together coordinately and shares the load. The traditional computational method causes the plane computed result to be smaller than the real result at some control spots of the deep strobe, which endangers the security of the entire structure, while at some spots the plane computed result may oversized and creates the nonessential material waste.Therefore, it is necessary thoroughly to analyze the strobe specially the stress characteristic of the deep strobe which has special structure. To know the stress characteristic and the weak link of each component, and improve the computational method, use the entire work characteristic of its three-dimensional system to enhance the whole security of the strobe with few materials.Considering the questions above, this article has done research and the summary from following several aspects: (1) Through the analysis and discussion of the existing plane system method (computational method stipulates in standard and other plane system methods done by researchers) ,discovers its deficiency and proposed the improved plane system computational method.(2) Through the analysis of the deep steel strobe's spatial structure mechanics mechanism, Points out unreasonable reason of the present design method, And has conducted the analysis research from following severalaspects:start from the angle of the strobe's load assignment plan, considering the girder consisted by the panel and beams as a whole with the elasticity theory method, to get the analysis formula of the beam's assignment load in the girder system.;This article also done some analysis and research on the thin wall deep beam which is often used in the deep steel strobe, discovered that for not considering the influence of the shearing force in the curving stress formula of tradition tall and slender beam, the error of the computed result is bigger, which made the design to be unreasonable, and even made it possible to threaten the security of the project. This article start from the differential equation of the beam deflection, inferred the curving stress formula of two axle symmetrical section deep beam under the function of uniform crosswise load; analyzed the factor that has affected the stress distribution, simultaneously, conducted the research to the distributed rule of curving stress along the beam section, and had drawn some reasonable conclusions;Discussed the factors which affected the supporting capacity of the arc gate arm, analyzed the question existed in the current method which can calculate the limited supporting capacity of arc steel strobe, and introduced the method that is more feasible in calculating arc steel strobe's limited supporting capacity, simultaneously, proposed a finite element model which can be widely used in the computation of arc steel strobe's limited supporting capacity.(3) Through carries on the analysis to the different design method of deep the steel strobe, has obtained the more reasonable computation diagramof deep steel strobe , and it has the certain instruction significance to the steel strobe'sdesign.(4)In view of two steel strobe examples (a plan gate and an arc gate), establishes its model using the three-dimensional system method named limited unit method, through analysis and summary, and To prevail the computed result by the limited unit method, estimated precisely on the assigned load analysis formula, discovered that the result was reasonable and more closer to the real result. |
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