Square steel pipe, rectangular steel pipe carrying capacity

Square steel pipe, rectangular steel pipe welded hollow spherical joints carrying capacity and practical calculation method

 

Welded hollow spherical joints grid, one of the the most widely used form node in the network shell, it has a simple structure, clear force transfer and convenient connection. The project "Water Cube" National Aquatics Center built for the 2008 Olympic Games with the square steel pipe, rectangular steel welded hollow spherical joints, but the current study are welded spherical joints with the circular steel, square steel pipe complex no related research and rectangular steel pipe welded spherical joints. In this paper, finite element analysis, experimental research, as well as simplified theoretical solution in three ways, at both nodes in force under the combined effect of the axial force, bending moment, and both performance and failure mechanism, the ultimate goal is to establish the fact, using the calculation method.

First of all, on the basis of access to large amounts of relevant literature, described in more detail in the development process of the welded hollow spherical joints Research summarizes more than 40 years on the bearing capacity of welded hollow spherical joints formula. Pointed out that the research background, and clearly the main contents of the thesis. Square steel tubes welded hollow spherical joints specific geometric features defined coordinate system, given its calculation model, and then the application of the thin shell theory shell theory formulas, based on the calculation model and coordinate system, given the connection of the housing and boundary conditions. Square steel tubes welded hollow spherical shell shell theory formula is more complex, the application of analytical method is very difficult to obtain the analytical solution, final elastic analysis was carried out using the finite element method.

 

The ideal elastoplastic stress - strain relations and Von-Mises yield criterion, taking into account the geometric nonlinearity, square steel pipe, rectangular steel pipe welded hollow spherical node finite element analysis model of the impact square steel pipe, rectangular steel pipe welding hollow The the ball the node carrying capacity of some important parameters for in-depth analysis. Studies show that the welded hollow spherical joints of the axial force and bending moment, axial force - bending moment correlation has nothing to do with the geometric parameters of the node, which greatly simplifies the calculation of the bearing capacity of the nodes in the axial force and moment under . In addition, analysis of the square steel pipe, rectangular steel pipe welded hollow spherical joints stress distribution under the axial force, bending moment, and both together. Welded hollow spherical joints loads destruction the punching destruction of the characteristics of, punching surface shear stress played a role in the control principle derived square steel pipe, rectangular steel pipe welded hollow spherical joints in the axial force, bending moment, and both simplified theoretical solution, under the joint action given the node formula preliminary form of. For further in-depth understanding of square steel pipe, rectangular steel pipe welded hollow spherical joints force performance and failure mechanism, verify the correctness of the theory and the finite element model, square steel tubes (six of them with the three different specifications 10 welded spherical joints, 4 with the rectangular steel) were studied. Simplify comprehensive theoretical solution, finite element analysis and test results, square steel pipe, rectangular steel pipe welded hollow spherical joints in the formula for calculating the axial force, bending moment, and both together, available for practical engineering design uses, but also for The related amendment to the statutes provide a basis.