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However, beam and plate elements give force output which is usually easier to interpret for design purposes. This is especially true at thick details and where parts join beams and plates would overlap and not represent the true attachment well. ST7-1.70.20.1 Extracting Forces and Moments from a Brick Meshīrick elements are able to model thick structures with more accuracy than plate or beam elements. It considers only the tensioned steel bars located in the tensile part of the concrete section. Simplified (bending only) consists of three basic features: It considers only Moments M as shown in dialog box figure. The dialog is shown in the following figure: There can be up to four layers of reinforcement bars included and defined for analysis. ST7-1.70.10.3 Using the Reinforced Concrete ModuleĬoncrete is a widely used construction material with high compressive yet low tensile strengths. For a linear material analysis, the components (xx, (yy, and (xy are calculated. These are the -z surface (where z=-t/2), the +z surface (where z=+t/2) and the mid-plane surface (where z=0). All six components are available at three layers through the plate thickness, t. These components are three direct stresses ((xx, (yy, (zz) and three shear stresses ((xy, (xz, (yz ) or ((xy, (xz,(yz) and as shown in the figure. Strand7 reports six components of local stress for plate/shell element results. ST7-1.70.10.2 Local Stress Results in Plate and Shell Elements The solver determines three moments at each Gauss point: Mxx, Myy and Mxy in this local system.
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When plate/shell elements are used in Strand7, the resultant moments at each element Gauss point are calculated by the solver. Misinterpretation of results may occur without a clear understanding of the definitions of bending moments in a Strand7 model. This Webnote describes the sign and direction conventions for bending moments in plate elements. ST7-1.70.10.1 Moment Conventions in Plate Elements