Beam Pocket Conditions (Available for use with VIEW, VIEW-Plus and ProVIEW)

The ability in TrusCAD to easily generate an interior bearing beam pocket condition is available for trusses with lumber oriented in the 2x and 4x (SY42) directions.  VIEW uses the Add Condition tool in the Webs toolbar to accomplish the addition of beam pocket conditions.

How Do I Add a Beam Pocket Condition to trusses?

To add a condition to a truss in TrusCAD, select Webs , and then click the Add Condition icon.

   Truss Types Oriented in the 2x direction:

After selecting Add Condition icon, the Figure-V.01 Add Direction dialog window appears with an option for Beam Pocket/Sleeve.  Click the button with the Beam Pocket/Sleeve image to select the Beam Pocket Condition.

Figure-V.01

The prompt at the bottom of the VIEW screen instructs you to: Select the Center/Top Position for the new Bearing (<Ctrl> for an Existing Bearing).  This instruction provides one of two choices to select:

Figure-V.02

Figure-V.03

1.       Select the Center/Top Position for the new Bearing: The cursor is active and waiting for information in the input box.  The information it is waiting for are the X and Y (Center/Top) direction coordinates of the beam pocket bearing location. You may enter this manually, or you can click the mouse onto a defined location within the truss (Figure-V.02).

2.      <Ctrl> for an Existing Bearing: If an existing bearing is present, press and hold down the <Ctrl> key on the keyboard and click the bearing.  The mouse pointer changes into a magic-wand hand that you click the existing bearing with.  This selects the bearing which displays the Add Beam Pocket Condition dialog window (Figure-V.03).

Once you choose either 1 or 2, VIEW displays the Add Beam Pocket Condition dialog window (Figure-V.04), which contains the following settings:

Figure-V.04

v   Block Size: This toggle option allows you to select a Block Size based on the available lumber in the lumber inventory file.

v   Num. Blocks: This field is always grayed out and set to AutoVIEW understands to fill in the area above the bearing with the correct quantity of vertical members.

v   Minimum Gap: This is the minimum gap at each side (face) of the bearing.  It is not the actual gap size, just the minimum.

v   Break Bottom Chord: When selected, the section of bottom chord is removed (visually) from the beam pocket area.  Selection of this option automatically selects and grays out the Remove BC Segment in Field option (Figure-V.05) to insure the correct truss analysis.

Figure-V.05

v   Remove BC Segment in Field: When selected, the truss analysis takes removal of the BC section under the beam pocket into consideration, even if the Break Bottom Chord option is not selected.

v   Beam Pocket Slider: When selected, a Slider member is added to the underside of the top chord over the beam pocket bearing.  This is enabled for SY42 truss types only.

v   Bearing Size: Allows you to input the exact bearing size for the beam pocket condition.

v   Bearing Location: Verifies the bearing location you input, and allows you to change it if necessary.

Once youve input the desired criteria, click OK to apply the beam pocket condition.

   Truss Types Oriented in the 4x (SY42) direction:

In addition to the Beam Pocket/Sleeve option described above, the SY42 Add Condition dialog window includes an option button called Cut Chord (Figure-V.06).  To add a Cut Chord to your SY42 truss, click the Cut Chord button.

Figure-V.06

After you select the Cut Chord button, the prompt at the bottom of the VIEW screen instructs you to: Select the Center/Top Position for the new Bearing (<Ctrl> for an Existing Bearing).  The choices for this instruction are the same as for the 2x option described above.  After you positioned the bearing, VIEW displays the Add Cut Chord condition dialog window (Figure-V.07), which contains the following settings:

Figure-V.07

v  Gap: Actual Gap size (in Inches and sixteenths format), of the separated Top Chord (Figure-V.08).

Figure-V.08

v  Break Top Chord: When Selected, VIEW removes the top chord in the gap area (Figure-V.08).  If left Unselected, the top chord remains intact, but the vertical webs are spaced according to the Gap size specified.

v     Bearing Size: Allows you to input the exact bearing size.

Once youve input the desired criteria, click OK to apply the condition.

Additional Method for adding a Beam Pocket

Figure-V.09

Beam Pockets may also be added from the Bearings menu.  Click the Add Bearing icon .  The input prompt instructs you to: Please Input New Bearing Location.  You may either manually enter the X/Y bearing coordinates into the Enter field, or click the mouse on a defined location within the truss to locate the new bearing.

Once the bearing is positioned, a Prompt dialog window asks if you want to: Auto Interior Bearing? (Figure-V.09). Respond by clicking YES, which causes the Add Beam Pocket Condition input screen to open. Click OK to add the beam pocket condition.

Deleting a Beam Pocket Condition

The Delete Condition icon is located on the Webs toolbar.

Once youve clicked Delete Condition, the bottom screen prompt instructs you to: Select the Condition(s) to Delete. <Enter> After Selection to Delete.  Click the Beam Pocket Condition and it turns Red (Figure-V.10), which verifies your selection.  When you click <Enter>, the condition is deleted.

Figure-V.10

Notice when the condition is deleted, the bearing was not.  If the purpose of deleting the beam pocket was because of incorrect bearing location, leaving the bearing in place after deleting the beam pocket provides you with the opportunity to go to the Bearings menu and Move Bearing icon the bearing to the correct position.

Once you have positioned it correctly, select the Add Condition icon and click the Beam Pocket/Sleeve button.  Hold down the <Ctrl> key and click onto the existing bearing, VIEW prompts you before webbing around the pocket.  Follow the instructions for selection choice 2 of Truss Types Oriented in the 2x Direction section of this topic.

Editing a Beam Pocket Condition

1.    Select the Edit Bearing icon from the TrusCAD Bearings toolbar.

2.      Click the mouse pointer onto the beam pocket Bearing to edit.

3.   The selected bearing is highlighted Red and the Edit Bearing Options dialog window opens.  Change the bearing size, reference edge, and/or location within the dialog window.  Click OK.

4.      The Auto Interior Bearing prompt appears.  If you respond by clicking:

A.  Yes: The Add Beam Pocket Condition dialog window opens.  This occurs because VIEW understands the bearing is located inside the truss perimeter.  Enter any criteria changes, and then click OK.

B.  No: If changes were entered in the Edit Bearing Options dialog window, VIEW assumes you no longer want the beam pocket condition and deletes it.  However, the bearing is not deleted.  VIEW prompts to move the bearing when either Engineer or Fast Track   is clicked.

Moving a Beam Pocket Condition

1.    Select the Move Bearing icon from the TrusCAD Bearings toolbar.

2.      Click the mouse pointer onto the beam pocket Bearing to move.

3.   The selected bearing is highlighted Red, and activates the Bearing Reference Edge dialog window (Figure-V.11).

Figure-V.11

4.      The input prompt instructs you to select a new bearing location. You may do this by either:

A.  Typing in the X/Y location of the new bearing location in the input window at the bottom of the VIEW screen and clicking <Enter>:

B.    Clicking the mouse pointer somewhere within the inside perimeter of the truss.  This instantly moves the bearing and displays the Auto Interior Bearing prompt (Figure-V.09).  From here, follow the step 4 instructions for Editing a Beam Pocket Condition.