<!DOCTYPE html
  PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<!--
Copyright (c) 2006 UGS Corp.

All Rights Reserved.

This software and related documentation are proprietary to UGS Corp.
-->
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>CBAR</title>
      <script language="javaScript">
        abridged="false";
        displayConditions=new Array();
      </script>
      <link type="text/css" href="../css/main_styles.css" rel="stylesheet">
   </head>
   <body class="bodydocs" onload="top.pageLoader()" bgcolor="#FFFFFF">
      <hr noshade="true">
      <div class="title_refTopic" id="xps10_pagetitle">CBAR </div>
      <hr noshade="true">
      <h4 class="refClassification">Simple Beam Element Connection </h4>
      <p class="para_refTopic">Defines a simple beam element. </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
            </colgroup>
            <thead>
               <tr>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">3 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">4 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">5 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">6 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">7 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">8 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">9 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">10 </p>
                  </td>
               </tr>
            </thead>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CBAR </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">EID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">PID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">GA </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">GB </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X1 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">X3 </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">PA </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">PB </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W1A </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W2A </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W3A </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W1B </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W2B </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W3B </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Example: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
            </colgroup>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CBAR </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">39 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">7 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">3 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">0.6 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">18. </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">26. </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">513 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Alternate Format and Example: </div>
      <div class="refCategoryContent">
         <table border="1" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
            </colgroup>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CBAR </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">EID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">PID </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">GA </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">GB </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">G0 </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">PA </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">PB </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W1A </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W2A </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W3A </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W1B </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W2B </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">W3B </p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
            </tbody>
         </table><br><table border="1" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
               <col span="1" width="10*">
            </colgroup>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CBAR </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">2 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">39 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">7 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">6 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">105 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">513 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">&nbsp; </p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Fields:</div>
      <div class="refCategoryContent">
         <table cellpadding="10" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="24.78*">
               <col span="1" width="75.22*">
            </colgroup>
            <thead>
               <tr>
                  <th align="left" colspan="1" rowspan="1">
                     <p class="para_th"><b class="uiTerm">Field </b></p>
                  </th>
                  <th align="left" colspan="1" rowspan="1">
                     <p class="para_th"><b class="uiTerm">Contents </b></p>
                  </th>
               </tr>
            </thead>
            <tbody>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">EID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Unique element identification number.  (Integer &gt; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">PID </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Property identification number of a PBAR or PBARL entry.  (Integer &gt; 0 or blank; Default = EID unless BAROR has a nonzero entry in field 3.) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">GA, GB </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Grid point identification numbers of connection points.  (Integer &gt; 0; GA &ne; GB) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">X1, X2, X3 </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Components of orientation vector </p>
                     <p class="para_td"><img align="bottom" src="graphics/bulkc1-ufig03.gif" border="0">, from GA, in the displacement coordinate system at GA.  (Real) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">G0 </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Alternate method to supply the orientation vector </p>
                     <p class="para_td"><img align="bottom" src="graphics/bulkc1-ufig03.gif" border="0"> using grid point G0.  The direction of <img align="bottom" src="graphics/bulkc1-ufig03.gif" border="0"> is from GA to G0. <img align="bottom" src="graphics/bulkc1-ufig03.gif" border="0"> is then translated to End A.  (Integer &gt; 0; G0 &ne; GA or GB) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">PA, PB </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Pin flags for bar ends A and B, respectively.  Used to remove connections between the grid point and selected degrees-of-freedom of the bar.  The degrees-of-freedom are defined in the element&rsquo;s coordinate system (see <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_9.html#ref55082');return(false);">Figure 12-</a>).  The bar must have stiffness associated with the PA and PB degrees-of-freedom to be released by the pin flags.  For example, if PA = 4 is specified, the PBAR entry must have a value for J, the torsional stiffness.  (Up to 5 of the unique integers 1 through 6 anywhere in the field with no embedded blanks; Integer &gt; 0.) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">W1A, W2A, W3A, W1B, W2B, W3B </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Components of offset vectors </p>
                     <p class="para_td"><img align="bottom" src="graphics/bulkc1-ufig04.gif" border="0"> and <img align="bottom" src="graphics/bulkc1-ufig05.gif" border="0">, respectively (see <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_9.html#ref55082');return(false);">Figure 12-</a>) in displacement coordinate systems at points GA and GB, respectively.  See Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_9.html#ref50351');return(false);">8-7</a> (Real; Default = 0.0) 
                     </p>
                  </td>
               </tr>
            </tbody>
         </table><br><table border="0">
            <tr>
               <td valign="top" align="left"><img align="left" src="../graphics/note.gif" alt="Note" title="Note"></td>
               <td valign="bottom" align="left" width="100%">
                  <div class="para_note">
                     <p class="para_note_body">See the BEAMOR entry for default options for field 3 and fields 6 through 8. </p>
                  </div>
               </td>
            </tr>
         </table>
      </div>
      <div class="title_refCategory">Remarks: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">Element identification numbers should be unique with respect to all other element identification numbers. </p>
            </li>
            <li>
               <p class="para_item"><a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_9.html#ref55082');return(false);">Figure 12-</a> and <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/13topic_9.html#ref71957');return(false);">Figure 12-</a> define bar element geometry with and without offsets. 
               </p><a name="ref55082"></a><div class="figure">
                  <p align="center"><img align="bottom" src="graphics/bulkc1-fig07.gif"></p>
               </div>
               <div class="title_figure">Figure. CBAR Element Geometry with Offsets </div><a name="ref71957"></a><div class="figure">
                  <p align="center"><img align="bottom" src="graphics/bulkc1-fig08.gif"></p>
               </div>
               <div class="title_figure">Figure. CBAR Element Geometry without Offsets </div>
            </li>
            <li>
               <p class="para_item">Figure 8-10 and Figure 8-11 define the elemental force and moment sign convention. </p>
               <div class="figure">
                  <p align="center"><img align="bottom" src="graphics/bulkc1-fig09.gif"></p>
               </div>
               <div class="title_figure">Figure. CBAR Element Internal Forces and Moments (x-y Plane) </div><a name="ref40939"></a><div class="figure">
                  <p align="center"><img align="bottom" src="graphics/bulkc1-fig10.gif"></p>
               </div>
               <div class="title_figure">Figure. CBAR Element Internal Forces and Moments (x-z Plane) </div>
            </li>
            <li>
               <p class="para_item">The continuation may be omitted if there are no pin flags or offsets. </p>
            </li>
            <li>
               <p class="para_item">For the case where field 9 is blank and not provided by the BAROR entry, if an integer is specified in field 6, then G0 is used; if field 6 is blank or real, then X1, X2, X3 is used. </p>
            </li>
            <li>
               <p class="para_item">See <a class="links" href="javascript:void(0)" onclick="top.popUpPage('QRG/linkInter_target_not_resolved.html#User:ref17864:-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">&ldquo;Overview of Coordinate Systems in NX Nastran&rdquo;</a> in the <em>NX Nastran User&rsquo;s Guide</em> for a definition of coordinate system terminology. 
               </p>
            </li>
            <li><a name="ref50351"></a><p class="para_item">Offset vectors are treated like rigid elements and are therefore subject to the same limitations. </p>
               <ul>
                  <li>
                     <p class="para_item">Offset vectors are not affected by thermal loads. </p>
                  </li>
                  <li>
                     <p class="para_item">The specification of offset vectors is not recommended in solution sequences that compute differential stiffness because the offset vector remains parallel to its original orientation.  (Differential stiffness is computed in buckling analysis provided in SOLs 5, 16, 105, and 200 and also in nonlinear analysis provided in SOLs 106, 129, 153, and 159 with PARAM,LGDISP,1.) </p>
                  </li>
               </ul>
            </li>
         </ol>
      </div>
      <div class="title_refCategory">Remarks related to SOLs 601 and 701: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">W1A, W2A, W3A, W1B, W2B, and W3B are ignored. </p>
            </li>
            <li>
               <p class="para_item">CBAR defines the same element as CBEAM for SOL 601 and 701. </p>
            </li>
            <li>
               <p class="para_item">Result output for this element is requested using Case Control command STRESS. However, element forces instead of stresses are output for CBAR (and CBEAM) elements. </p>
            </li>
         </ol>
      </div>
   </body>
</html>