| Steel structure advantage is that the amount of steel province,light and beautiful,simple node form,excellent structural properties,it quickly developed into an important structure in the form of having a more extensive range of applications.Tianjin large cantilevered Samaranch Memorial and large span steel truss structure part,which make full use of the characteristics of the steel structure of the ceiling space of pipelines and equipment to ensure that the requirements of the construction program ceiling height,high quality requirements of the project.Branch pipe band truss stiffeners is a common form of nodes,is mainly used between the manifold(web member)the smaller the angle,the larger diameter,this structure not only makes installation easier,and make up stronger large quantities weakened branch,designed for the study of plate manifold strengthen still few specifications have also not clearly defined.In view of this,this paper carried out the following research:(1)theoretical study to determine failure characteristics and failure mechanism of steel truss nodes;expounded the theory of finite element,including elastoplastic theory and nonlinear theories.(2)Experimental study on the use of the loading device for loading specimens were tested to determine the influence of wall thickness and diameter K-type steel tubular joint ultimate bearing capacity of the specimen.(3)the use of finite element software ansys established K type between different variables and the angle between the webs smaller case(with a shaped outer reinforcing plate)and KK type(with a cross-shaped outer reinforcing plate)steel pipe limited node metamodel,also were established without strengthening K-type plate(including a weakening and two weakened both cases),KK-type steel tubular joint(including three to weaken and undermine both cases four)finite element model,comparative analysis,the mechanical characteristics of the reinforcing plate,in order to develop a formula designed to strengthen the plate thickness. |
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