RAM Concrete Shear Wall Tutorial

To design all your concrete Shear Walls you need to be in the Concrete Shear Wall Design Mode. To switch to the concrete column mode:

Before you can enter the concrete Shear Wall design mode the RAM Frame analysis should have been performed.

The mode drop-down on the toolbar will indicate you are in Shear Wall design mode.

Concrete Shear Wall Criteria

The criteria by which concrete shear walls are designed is dependent on the design code selected. For this example, select the ACI 318-08 (BS8110:1997) design code.

Review the Design Code Parameters:

For the purposes of this tutorial, copy these settings:

Wall Design Groups

In the Concrete Shear Wall program, walls are grouped for design into “Wall Design Groups”. A Wall Design Group can consist of a single wall or multiple walls. To assign Wall Design groups, do the following:

Right click the mouse to return to the Assign Wall Design Groups dialog.

Note that the Wall Design Group number is update to 2, indicating that the next assignment will default to Wall Design Group number 2. The “new” in parentheses denotes that no walls are currently assigned to Wall Design Group 2.

Now all of the walls in the model belong to a wall design group.

You can also assign a wall panel priority to any wall panel which will force the program to design that wall panel first. To assign a Wall Panel Priority:

NOTE: This is an arbitrary number, but the higher number will get the higher priority. All walls have Priority zero unless otherwise assigned.

Wall Panels with an assigned priority.

Assign Section Cuts

There are two ways to assign section cuts to a wall design group: automatic generation or manual assignment.

We’ll start with automatically generating section cuts.

The Assign Autogenerated Section Cuts dialog will open with the following defaults. Note that the “Max Cut Spacing” of 0.0 results in the greatest possible spacing between cuts.

Now we will manually add section cuts to Wall Design Group 3. To assign section cuts manually, you must be in elevation view. You can select elevation view before issuing the add command or, if you issue the command first, you will be prompted to do so.

Before the dialog opens, you must draw a line through your wall using the mini-target cursor at the approximate location of where you want your section cut.

When you release the mouse, the Add Section Cut dialog will open.

If there were multiple walls in this wall design group, checking the “Include All Wall in Wall Design Group” would result in the section cut being assigned to all walls, even if they are out of plane of the originally selected wall.

Create and Assign Bar Pattern Templates

During the design process, reinforcement is selected for the walls based on the Bar Pattern Template assigned to the Wall Design Group. This is similar to the bar groups in the concrete column program.

You can access the “Edit Bar Pattern Template” dialog to create bar pattern templates either from the menu or from the Assign Bar Pattern Template dialog. For this example, we will access it through the assign dialog.

Manual Reinforcement and Special Boundary Elements

In accordance with the design requirements of many design codes, Special boundaries can be assigned to a wall or walls through the manual reinforcing command.

Generate Load Combinations for Design

The design of concrete shear wall is based on combinations of loads rather than individual loads. Use the load combination generator to create the code specified load combinations.

Load combinations can be turned on and off for consideration in the design. The more load combinations that are turned “on”, the longer a design will take.

Design Wall Design Group 1

When the View/Update dialog opens, use the target cursor to select a section cut for which results will be displayed. The selected section cut will be highlighted in orange. At the top of the wall is a group of buttons that allow you to zoom and alter the keyboard and mouse functions. Familiarize yourself with these buttons. In the bottom portion of the screen you will notice the manual reinforcement you entered earlier displayed graphically.

Review Axial-Flexural Design Results:

The axial-flexural design results for the selected Section Cut are displayed in tabular form in the screen to the right. Each row in the spreadsheet corresponds to a load combination.  Above the spreadsheet is a summary of the design, including information on the controlling load combination.

The locally (Mumaj, Mumin) and globally (Muxx, Muyy) oriented required moments for the selected load combination is then displayed below the spreadsheet.

The axial verses flexural plot that is shown corresponds to the angle resulting from Mumaj and Mumin for the selected load combination, referred to as the β angle.

Review Shear Design Results:

Review the boundary Element Design Results:

Modifying the Design

Design wall group 3 in a similar fashion to Wall Group 1 by using the View/Update command. Notice that only the 2 user assigned section cuts are available for display.

Note that the Section Cuts for the Wall Panel to which the bar belongs have turned yellow, indicating that the design is not current and needs to be run again.

NOTE: When a new cell is selected, the bar is highlighted in the 3D view window.

Review the Design Results

This completes the Tutorial for RAM Concrete. Proceed to the next section in order to work the RAM Foundation Tutorial.