Note that the module will know whether the bars are in tension or compression and will handle the calculations properly. When you look at the top one, you can read it as " The top bar set is 3 inches from the bottom of the beam ". The column highlighted in light blue titled "Dist of bar om." is how you set the vertical position of the bar sets in the beam. Each bar set is referenced on the sketch with a color shown as a dot to the left of the set description. On the right side of this tab you can specify up to 6 bar sets (quantity, size, vertical location and start/stop endpoints). When you click on a span (for multi-span beams) in the topmost section of the window, the span length and rebar layout will update to display the arrangement that is specific to that span. The cross section shape and dimensions are the same for all spans. This tab has some pieces of input that are constant for all spans and some that can vary on a span-by-span basis.
This will affect factored load moments and shears and service load level deflections and reactions. Thus the moment distribution across multiple spans will be properly performed.
For multiple-span beams, this will affect the relative stiffness of each beam span.
Thus the module creates a very accurate variable stiffness model of the beam based on actual moments. The effective moment of inertia for each segment (for each load combination) is calculated using the actual unfactored moment on that segment. This module divides each span into a series of segments. NOTE: It is important to know how this module operates with regard to beam stiffness along the span, and how this affects multi-span beams. On the right side of this tab are all the required rebar, concrete strength and elastic modulus entries, shear stirrup data, strength reduction factors and deflection criteria to check. Selecting Single Span Beam on Elastic Foundation will remove the ability to select end support conditions, and it will provide an entry for the Modulus of Subgrade Reaction of the supporting soil. In the screen capture below you can see the two large selection boxes. This module also has a beam on elastic foundation option for single-span beams. That shape can have up to six groups of reinforcing per span, and the reinforcing can vary on a span-by-span basis. The concrete beam module handles single- and multiple-span beams using ONE cross section shape. In this section, for each input tab we will review only the items that are unique to the CONCRETE material type.
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