Sap2000 slab design

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Sap2000 slab design

To browse Academia. Skip to main content. Log In Sign Up. In SAP terminology, those resultants are the three membrane force components f11, f22 and f12; the two flexural moment components m11 and m22 and the twisting moment m12; and the two transverse shear force components V13 and V The design imple- mentation in SAP assumes there are no diagonal cracks in the core.

In such a case, a state of pure shear develops within the core, and hence the transverse shear force at a section has no effect on the in-plane forces in the sandwich covers. Thus, no transverse reinforcement needs to be provided, and the in-plane reinforcement is not enhanced to account for transverse shear.

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As shown in Figure 1, the slab is conceived as comprising two outer layers centered on the mid-planes of the outer reinforcement layers. The six resultants, f11, f22, f12, m11, m22, and m12, are resolved into pure mem- brane forces N11, N22 and N12, calculated as acting respectively within the central plane of the top and bottom reinforcement layers.

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In transforming the moments into forces, the lever arm is taken as the distance between the outer reinforcement layers. For each layer, the reinforcement forces NDes1, NDes2, concrete principal compressive forces Fc1, Fc2, and concrete principal compressive stresses Sc1 and Sc2, are calculated in accordance with the rules set forth in Brondum- Nielsen Reinforcement forces are converted to reinforcement areas per unit width Ast1 and Ast2 i.

Basic Equations for Transforming Stress Resultants into Equivalent Membrane Forces For a given concrete shell element, the variables h, Ct1, Ct2, Cb1, and Cb2, are constant and are expected to be defined by the user in the area section prop- erties.

area loading drawing meshing load assign uniform shell view shear,bending, axial moment sap2000

If those parameters are found to be zero, a default value equal to 10 percent of the thickness, h, of the concrete shell is used for each of the vari- ables. The stress reduction factor is assumed to always be equal to 0. Technical University of Denmark. Report NR.

Marti, P. Design of Concrete Slabs for Transverse Shear. ACI Structural Journal. References Page 9 of 9. Related Papers. By Jan Knippers. By Ibrahim G Shaaban.

Flat Plate Slab design using Section Cut in SAP2000

Limits to the strength design of reinforced concrete shells and slabs. Reinforcing tailor-made concrete structures: Alternatives and challenges. By Karin Lundgren. By haile berhe. Download pdf.Is there any way I can design a plate element for example a flat plate using FEM program? These contour plots a not useful to have a quick insight on the analysis results. Hence presenting the contour plots in the design reports is not a good practice.

sap2000 slab design

A way out is to use section cut techniques which are available in most of the FEM packages. We can defined the section cuts according to the strips defined in the ACI code.

The output for the strips shall be the more familiar bending moment and shear force diagram plotted along the length of the strips. 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. Consider a reinforced concrete flat plate rested over 3m high columns. The structure consists of two bays in x-direction and two bays in y-direction.

The bay width in x and y-directions is 5m. The slab thickness is mm. The column size is mm square. Design the flat plate using section cut techniques in SAP Since the flat plate is symmetrical in two directions, one needs to define section cuts in one direction and for half the slab.

Figure 1: Example reinforced flat plate with the section cuts marked for column strips and middle strip. The slab can be divided into column strips and middle strips, according to the ACI code.

Since the flate plate is symmetrical in two directions, one needs to define strips in one direction and for half the slab. Hence two column strips and one middle strip is marked on the figure 1. 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. For this purpose, 5 section cuts are to be defined in each span for each strip 10 section cuts per strip.

The section cuts are numbered in the figure 1. One can use the option. But the output is not saved for future use, if this option is used. There is another way to define section cuts using.

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The section cut has to be defined using Quadrilateral cutting plan. It is preferable that the cutting plane be kept slightly away from the nodes, because sometimes SAP is unable to process the output for the section cuts exactly at the nodes, and report a zero values.

Figure 3 shows the data for section cut definition for column strip 1 for section cut 1. Note that the slab is at elevation 3m in z-direction. Therefore the cutting pane is defined such that the slab is cut by the plane. Figure 2: Define section cut dialogue box. Figure 3: Section cut definition for column strip section cut 1.

Similarly 10 section cuts are defined for each strip. The output for the section cuts can be called for all the load cases and combinations and processed.Log In. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action. Click Here to join Eng-Tips and talk with other members! Already a Member? Join your peers on the Internet's largest technical engineering professional community.

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Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. Hi all, When is it most appropriate to model a concrete slab with a membrane or a shell thin element. For example, do you model a mm thick concrete slab with a membrane or shell element. If it is a mm thick slab supported by beams on all sides or two sides, model it as a membrane so as to accurately capture the design forces in the beams If it is a two way slab, model it as a shell.

So how do one go about analyzing and designing the slab? It depends. Membrane and plate functions are both introduced in a shell element. I alsways use shell elements and if needed modify the property modifiers accordingly. I mainly use membrane when I am dealing with one way slabs.

Also, like John says, you can do with property modifiers in shell elements. Good day all, One benefit of using shells for concrete slabs in ETABS is that the program automatically considers T-beam action for all beams with shell elements properly placed on them.

I use membranes mainly because it distributes the surface load assigned to it either one way or two way as you please and evenly at that compared to shells which you are required to mesh in some acceptable size in order to distribute the loads properly.Log In.

Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action. Click Here to join Eng-Tips and talk with other members! Already a Member? Join your peers on the Internet's largest technical engineering professional community. It's easy to join and it's free. Register now while it's still free!

Already a member? Close this window and log in. Are you an Engineering professional? Join Eng-Tips Forums! Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden.

sap2000 slab design

Students Click Here. Related Projects. I am trying to model a slab-frame RC structure. I used the 3D frame Beam-Slab Building template in order to generate the model. My question is- Does the template account for the offset needed between the centroid of the slab section and the centroid of the beam underneath?On this page:. Answer: To create an opening within a section, draw over the shape which represents the section boundary a shape which represents the opening.

Right-click this shape, then change the material type to Opening. Answer: Stresses local to individual objects within a composite section may be checked using post-processing methods outside of the Section Designer. When analyzing composite sections, the Section Designer transforms the entire section into the base material specified on the Section Data form.

Stresses may be resolved manually once composite-section forces are obtained. Answer: Once the section is defined in the Section Designer, right-click on the section, then select the confined-concrete model, as shown in Figure 1. Longitudinal and transverse bar size and layout may then be specified.

Answer: For sections modeled using the Section Designercreep and shrinkage effects are calculated as though the entire transformed section is composed of the base material specified during section definition. Please note that time-dependent effects for composite sections may be evaluated correctly by explicitly modeling the different parts of a composite section, then by assigning the appropriate material properties.

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These modeling entities, such as frame griders and shell slabs, may then be connected using body constraintsrigid linksor another means that achieves composite behavior. Answer: Yes, this is accomplished through export and import of the Section Designer database tables. The process is as follows:. All rights reserved.

Powered by Atlassian. Technical Knowledge Base. Page tree. Browse pages. A t tachments 2 Page History Scaffolding History. Copy with Scaffolding XML. Dashboard Home Section Designer. Jira links. Created by Ondrejlast modified on Mar 27, Powered by Atlassian Confluence 6.Tutorial Name:. On this page:. SAP provides various ways to model the composite behavior of a beam-slab assembly. Attached are four SAP models which demonstrate various approaches. The geometric and material properties of the model used for comparison are listed as follows:.

The eight approaches to modeling composite behavior, described above, are applied using eight different beam models which are fixed at either end.

Flat Plate Slab design using Section Cut in SAP2000

Results are summarized as follows:. Please note that SAP calculations produce slightly greater values because shear deformation is considered in deflection. The deck-slab center line coincides with the section neutral axis. Therefore, the deck-slab contribution to section flexural stiffness will be negligible. Further, because there is no composite action, midspan deflection should be close to that of a naked girder.

In this model, slab shell objects are drawn at the girder center of gravity COGand then offset vertically, above the girder, to model composite action. The shells are offset such that the slab soffit is located above the girder top flange. In this model, the girder and the slab are drawn at their respective center-lines. The corresponding girder and slab joints are then connected through body constraints.

As implied by the list above, the composite action of a beam-slab assembly may be modeled using either area offsets, body constraintsframe insertion pointsor links. The eight approaches to composite-behavior modeling, described above, are applied using eight different simply supported beam models. All rights reserved. Powered by Atlassian. Page tree. Browse pages. A t tachments 6 Page History Scaffolding History. Copy with Scaffolding XML. Jira links.

Ribbed Slab Design in SAP2000

Created by Ondrejlast modified on Mar 27, Name: Composite section Description: Several approaches to the modeling of composite sections. Program: SAP Version: Beam 1 top beam nocomposite 1. Beam 2 composite 0. Beam 3 composite 0. Beam 4 composite 0.Is there any way I can design a plate element for example a flat plate using FEM program? These contour plots a not useful to have a quick insight on the analysis results. Hence presenting the contour plots in the design reports is not a good practice.

A way out is to use section cut techniques which are available in most of the FEM packages.

Design of Slab in SAP2000

We can defined the section cuts according to the strips defined in the ACI code. The output for the strips shall be the more familiar bending moment and shear force diagram plotted along the length of the strips.

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.

sap2000 slab design

Consider a reinforced concrete flat plate rested over 3m high columns. The structure consists of two bays in x-direction and two bays in y-direction. The bay width in x and y-directions is 5m.

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The slab thickness is mm. The column size is mm square. Design the flat plate using section cut techniques in SAP Since the flat plate is symmetrical in two directions, one needs to define section cuts in one direction and for half the slab. Figure 1: Example reinforced flat plate with the section cuts marked for column strips and middle strip.

The slab can be divided into column strips and middle strips, according to the ACI code. Since the flate plate is symmetrical in two directions, one needs to define strips in one direction and for half the slab. Hence two column strips and one middle strip is marked on the figure 1. 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.

For this purpose, 5 section cuts are to be defined in each span for each strip 10 section cuts per strip. The section cuts are numbered in the figure 1. One can use the option. But the output is not saved for future use, if this option is used. There is another way to define section cuts using. The section cut has to be defined using Quadrilateral cutting plan. It is preferable that the cutting plane be kept slightly away from the nodes, because sometimes SAP is unable to process the output for the section cuts exactly at the nodes, and report a zero values.

Figure 3 shows the data for section cut definition for column strip 1 for section cut 1. Note that the slab is at elevation 3m in z-direction. Therefore the cutting pane is defined such that the slab is cut by the plane. Figure 2: Define section cut dialogue box. Figure 3: Section cut definition for column strip section cut 1.

Similarly 10 section cuts are defined for each strip. The output for the section cuts can be called for all the load cases and combinations and processed. Figure 4: Section cut forces display. Figure : 5 Section cut forces.

In Excel the forces diagram for the strips can easily be drawing for any load combination by little processing of data. For this example M22 gives the bending moment about y-axis, and F33 gives the shear force along the length of strip. The outputs for the three strips are given in Figures below. The sign of the forces at most of the occasions has to be corrected manually. This is pretty easy to do.


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