Examples of these results are provided in Images 7 and 8, respectively. More information at: dlubalrfemrfem6rstab. The former describes the deformation between the initial input and the determined equilibrium shape, whereas the latter includes the force or stress conditions for the equilibrium shape, considering the defined form-finding parameters. Once the load case has been calculated, deformations as well as member and surface results can be graphically displayed via the Results tab of the Navigator. That being the case, a certain amount of computing time is saved, and the global form-finding process is faster. Thus, the path between the initial position and the target position is usually reduced for the actual iterative form-finding process. The preliminary form-finding displaces the FE surface elements by using the simple linear force-density method. The option to integrate the preliminary form-finding is also available in the settings. This results in slower convergence, but higher calculation stability.
Dlubal rfem form finding software#
in its entirety using a finite element software program (Dlubal RFEM). The form-finding calculation applies the absolute stiffness to the membrane surfaces, but the user can increase the stiffness by defining a value lower than 1. change any more in consequence of the form-finding process of the cable net.
La forma se encuentra utilizando el equilibrio entre la tensin superficial (carga de pretensado) y las reacciones de contorno naturales y geomtricas. Next, the Speed of Convergence that controls the calculation stability can be adjusted. El mdulo adicional RF-FORM-FINDING encuentra las formas de construcciones de membranas y cables. It is important to mention that to apply an orthotropic surface prestress, the Specific Axis option in the Main tab of the surface window should be checked, and the input parameters in Image 3 must be adjusted accordingly. The projection method is appropriate for models which are spanned around a central axis (conical shapes).
In general, the standard method should be preferred. As a matter of fact, the standard method describes a vector that can move freely in space until it reaches the target position, whereas the projection method describes a vector that can move partially in space and is fixed to its XY coordinates. The input data for the surface load of the form-finding type applied to membranes includes the calculation method (standard or projection), the form-finding definition (force or stress), and the magnitude of the associated load (Image 2). Form-Finding Load on Member Introduced as ForceĬonsideration of Initial State from Form-Finding Load Case
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