Surface Load Generators (esas.29)

 

esas.29

Plane Load Generator

The Plane Load Generator in module esas.29 converts surface loads to line loads on supporting beams. The Generator creates 2D planes which serve only to transfer the load to 1D elements and do not alter the strength or stiffness of the structure.

The tool improves workflow with large projects, because:

  • the user does not need to determine the size of supported regions per beam and calculate the load intensity for each beam manually;
  • there is no need to model plated structural elements like roof or wall panels, if these are considered not to have sufficient stiffness to contribute to the load-bearing capacity of the structure.

Features

  • The load plane is input graphically in the 3D window of SCIA Engineer;
  • The surface load may act in any direction, parallel to any coordinate system that is defined;
  • The shape of the load plane may be rectangular, circular, or a general polygon with straight or curved edges and may contain openings of any shape;
  • The user can select which beams in the loading plane will take up the load and leave other beams unloaded;
  • Plane loads remain editable after the load redistribution. The calculation always reflects the current definition of the loading polygon.

Limitations

  • 1D members that take up the load must be located in the loading plane;
  • The loading polygon (shape) must be planar;

Load Panel

Load Panels are non-structural elements that transform surface loads to line and point loads on structural elements (1D and 2D members).

  • The panels offer another, more advanced way to distribute loads from surfaces that do not participate in the bearing of loads in the structure;
  • Panels are suitable for a wider range of applications than the Plane Load Generator;
  • Load panels are required for the definition of 3D wind on frame structures (without load bearing walls) (esas.46);
  • Load panels remain editable after the load redistribution. The calculation always reflects the current properties of the load panels.

Load Panel types

Load Panels distribute the applied loads to entities that support them. Such entities can be (i) supported nodes (nodes linked to another member), (ii) edges (e.g. opening edges), or (iii) beams in the plane of the panel:

  • A Load Panel of type "Load to panel nodes" transfers the applied load to all or to selected panel nodes (panel node is a node defining the panel geometry).
  • A Load Panel of type "Load to panel edges" transfers the applied load to all or selected panel edges. Edges must be supported by beams or edges of 2D members.
  • A Load Panel of type "Load to panel edges and beams" transfers the applied load to all or to selected edges. In this case, a more accurate method can be used to determine the path of applied loads - a FEM analysis is performed to determine the load distribution.
  • Load panels may have openings. Internal edges at openings can also be used to take up loads (if beams are defined there).

The first two panel types distribute the load to participating nodes or edges uniformly, taking into account the edge lengths or number of nodes. However, the user can adjust the weight of individual edges or nodes so that these take up relatively larger/smaller portions of the load.

Additional features

  • Load Panels are available in all project types;
  • All load types can be used on the panel - free point load, free line load and free and normal surface load, wind and snow loads, etc.;
  • The loads on the panel may act in any direction, parallel to any coordinate system that is defined;

  • Supporting nodes and edges of a panel can be displayed;
  • The strength and stiffness of load panels are not considered in the analysis of the structure.

Applications:

Plane loads or Load panels can represent:

  • wall and roof sandwich panels with insufficient stiffness or fastener strength;
  • roof/wall windows subjected to wind or snow;
  • 3D Wind and snow loads on framed structures or structures without modelled envelopes.

16/10/2015