IES ConcreteBending User's Guide
Line Supports
Line Supports are used in ConcreteBending to restrain the model along a series of nodes that fall on a straight line which is defined by a start coordinate and an end coordinate in the XY-plane.
The thickness of the Line Support can be specified and is used with the length of the Line Support to calculate the punching shear perimeter for the two-way shear design check. The bending and one-way shear checks for a slab supported by a Line Supports are calculated at the face of the Line Support. Therefore, adjusting the thickness of the Line Support will change the location where the bending and one-way shear results are reported for the slab. While a Line Support has a defined thickness, it only provides restraint along a single line of nodes in the FEA model. ConcreteBending only allows deflection in the Z-direction and rotation about the X-axis and Y-axis. Line Supports fix the deflection of the nodes on the line in the Z-direction and fix the rotation of the nodes about a line in the XY-plane perpendicular to the Line Support. The three support options (Pinned, Fixed, and Spring) allow the rotational restraint about the line defined by the Line Support in the XY-plane to be specified.
The total force in the Z-direction and the total moment about the Line Support is calculated for each load case and reported in ConcreteBending. The slab punching shear results from a Line Support are reported when applicable.
Line Supports are not designed in ConcreteBending.
In ConcreteBending, Punching Shear design checks are performed at line support locations and the program automatically determines the punching shear perimeter (critical section). Additional information regarding punching shear design checks can be found on the Punching Shear page of the Help File.