There is another way to define section cuts usingīy using the Define -> section cut option the output for the forces on the section can be recalled and processed later on. One can use the optionīut the output is not saved for future use, if this option is used. The section cuts are numbered in the figure 1. For this purpose, 5 section cuts are to be defined in each span for each strip (10 section cuts per strip). Now the section cuts are to be defined to capture the total force (Shear force, bending moment and axial force) in the width of the strip. Hence two column strips and one middle strip is marked on the figure 1. Since the flate plate is symmetrical in two directions, one needs to define strips in one direction and for half the slab. The slab can be divided into column strips and middle strips, according to the ACI-318 code. (Since the flat plate is symmetrical in two directions, one needs to define section cuts in one direction and for half the slab)įigure 1: Example reinforced flat plate with the section cuts marked for column strips and middle strip Design the flat plate using section cut techniques in SAP2000. The slab is loaded by self weight of the slab and live load of 5 KN/m2. The bay width in x and y-directions is 5m. The structure consists of two bays in x-direction and two bays in y-direction. Note:- FEM package like SAFE has built in features similar to section cut, that’s why you get analysis results for strips.Ĭonsider a reinforced concrete flat plate rested over 3m high columns. An extra advantage of the diagrams will be that a diagrams (bending moment, shear force and axial force) for different load combinations can be drawn on one plot simultaneously, hence easy to determine the governing load combinations. The output for the strips shall be the more familiar bending moment and shear force diagram plotted along the length of the strips. We can defined the section cuts according to the strips defined in the ACI 318 code.
Hence presenting the contour plots in the design reports is not a good practice.Ī way out is to use section cut techniques which are available in most of the FEM packages. These contour plots a not useful to have a quick insight on the analysis results. Is there any way I can design a plate element (for example a flat plate) using FEM program?Īnswer: For a number of years what I have been observing is that most of the time the design reports include contour plots for the shell elements for different load combinations. How can I design a reinforced concrete flat plate in SAP2000?Įxpanded Question: When I model slabs (or shell elements) using FEM software, the usual output is the contour plots on the shells which are not very useful for designing.
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