Research On Kk-type Cast Steel Joint Of Tension Truss At Xuzhou Railway Station

With the wide application of large-span space system in engineering, there emerges a large number of complex structure. So, it requires strictly about the structural forms and the form of joints more than ever. Not only is a reliable force-transmission required, but also, for joint itself, the accuracy, weight, installation and so on are stricter than ever. The joints with traditional form can no longer meet the needs of structure development, while the cast steel joints can solve this problem. Cast steel joints have so many merits, such as, various form, beautiful shape, adaptable, integrity, clear force-transmission, high bearing capacity, large design freedom.In this paper, in order to get the mechanical characters, the KK-type cast steel joint is studied by testing and finite element analysis methods. It considers that the cast steel joints have a high security reservation. By testing method, it suggests that at the construction site, when cast steel joint cut, welded, it should be avoided at a complex stress area and an area that bar cross-section changes. The proper distance away from the above area is at least 500mm. It also suggests that for cast steel joints itself, during the course of design and construction, the impaction of force of belly bar also should be paid attention.Finally, the bearing capacity of cast steel joints has been studied by the method of orthogonal test method. It conveys that the thickness of chord bar has more influences than others on the bearing capacity, but, the angle between the belly bar in the cross horizontal plane has the minimal impact. Through a rational parameter adjustment, the failure of the cast steel joint can be avoided and the purpose of design optimization is reached. Therefore, the study in this paper can provide reference for the future design, construction, and specification amendment.