Numerical Studies of the Nodal Connections of Metal Spatial Frames

Abstract

For structural structures, there is a problem of high labor intensity of manufacturing nodal connections. In the nodes of structural structures can be paired about eighteen rods. The joints of structures are usually divided into two types. The known structures with the nodes of the leaves, with knots of massive details, with the nodes on the bolts with knots on the welding and stuff. Structures perceive external loads with all their elements, so each node connection is in a complex stress state. The design of the nodal connection determines the reliability and efficiency of the structural design. The reliability of the node spatial structures can be analyzed at design time by using advanced computational systems. that are executed based on the massive details (Mero, etc.) and nodes that are executed on the basis of thin metal sheets (Unistrat etc.). Techniques for optimal design of massive nodes and for nodes of the subtle elements are very different. The search for the optimal solution of the structural design unit can be organized in the form of an iterative process. Typically, nodes that are made from a massive part are very rigid. Internal stresses are distributed in the shortest directions from the load application areas to the support. Therefore, you can find little loaded areas in massive nodes. The material in these areas can be removed. Get a more efficient design of the node. Nodes made of thin sheet elements have a large deformability. The rigidity of the node has to be provided using special techniques. The internal stresses are locally concentrated. Therefore, it is necessary to look for solutions for local tightening and hardening of the node, for example, by installing ribs or local thickening of sheet metal parts. Improvement of the design of the unit can be achieved by adding material to its weaknesses. It is established that the results of calculations performed using different calculation complexes have acceptable accuracy of calculations. The error between the stress calculations performed in different calculation complexes does not exceed 10%.