The structural analysis software RFEM 6 is the basis of a modular software system. The main program RFEM 6 is used to define structures, materials, and loads of planar and spatial structural systems consisting of plates, walls, shells, and members. The program also allows you to create combined structures as well as to model solid and contact elements.
RSTAB 9 is a powerful analysis and design software for 3D beam, frame, or truss structure calculations, reflecting the current state of the art and helping structural engineers meet requirements in modern civil engineering.
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If a model has many degrees of freedom or there are several stable or metastable states, the minimal restriction of free translations or rotations of hinges or supports can lead to a faster convergence.
A minimal restriction here means that, for example, a small translational spring of 0.01 kN/m is applied for a nodal support that is freely movable in the global x-direction. The same applies to the rotations. The size of the value strongly depends on the modeled system. Thus, the value of 0.01 kN/m can have too much influence in a very small model.
Image 01 shows the dialog box of a thus limited line support. The translations of the y- and z-directions should be blocked here, but all other degrees of freedom should be free-moving. The small rotation and translation springs thus help in the calculation to achieve faster convergence.