<!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>RBAR</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">RBAR </div>
      <hr noshade="true">
      <h4 class="refClassification">Rigid Bar </h4>
      <p class="para_refTopic">Defines a rigid bar with six degrees-of-freedom at each end. </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>
                  <th align="center" colspan="1" height="26" rowspan="1">
                     <p class="para_th">1 </p>
                  </th>
                  <th align="center" colspan="1" height="26" rowspan="1">
                     <p class="para_th">2 </p>
                  </th>
                  <th align="center" colspan="1" height="26" rowspan="1">
                     <p class="para_th">3 </p>
                  </th>
                  <th align="center" colspan="1" height="26" rowspan="1">
                     <p class="para_th">4 </p>
                  </th>
                  <th align="center" colspan="1" height="26" rowspan="1">
                     <p class="para_th">5 </p>
                  </th>
                  <th align="center" colspan="1" height="26" rowspan="1">
                     <p class="para_th">6 </p>
                  </th>
                  <th align="center" colspan="1" height="26" rowspan="1">
                     <p class="para_th">7 </p>
                  </th>
                  <th align="center" colspan="1" height="26" rowspan="1">
                     <p class="para_th">8 </p>
                  </th>
                  <th align="center" colspan="1" height="26" rowspan="1">
                     <p class="para_th">9 </p>
                  </th>
                  <th align="center" colspan="1" height="26" rowspan="1">
                     <p class="para_th">10 </p>
                  </th>
               </tr>
            </thead>
            <tbody>
               <tr>
                  <td align="left" colspan="1" height="24" rowspan="1" valign="top">
                     <p class="para_td">RBAR </p>
                  </td>
                  <td align="center" colspan="1" height="24" rowspan="1">
                     <p class="para_td">EID </p>
                  </td>
                  <td align="center" colspan="1" height="24" rowspan="1">
                     <p class="para_td">GA </p>
                  </td>
                  <td align="center" colspan="1" height="24" rowspan="1">
                     <p class="para_td">GB </p>
                  </td>
                  <td align="center" colspan="1" height="24" rowspan="1">
                     <p class="para_td">CNA </p>
                  </td>
                  <td align="center" colspan="1" height="24" rowspan="1">
                     <p class="para_td">CNB </p>
                  </td>
                  <td align="center" colspan="1" height="24" rowspan="1">
                     <p class="para_td">CMA </p>
                  </td>
                  <td align="center" colspan="1" height="24" rowspan="1">
                     <p class="para_td">CMB </p>
                  </td>
                  <td align="center" bgcolor="" colspan="1" height="24" rowspan="1">
                     <p class="para_td">ALPHA</p>
                  </td>
                  <td align="center" bgcolor="gray" colspan="1" height="24" 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">RBAR </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">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">234 </p>
                  </td>
                  <td align="center" colspan="1" rowspan="1">
                     <p class="para_td">123 </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="9" width="100%" align="center">
            <colgroup span="1">
               <col span="1" width="18.22*">
               <col span="1" width="81.78*">
            </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">Element identification number. </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 number of connection points.  (Integer &gt; 0) </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CNA, CNB </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Component numbers of independent degrees-of-freedom in the global coordinate system for the element at grid points GA and GB.  See Remark <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/19topic_20.html#ref94872');return(false);">28-1. </a> (Integers 1 through 6 with no embedded blanks, or zero or blank.) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">CMA, CMB </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Component numbers of dependent degrees-of-freedom in the global coordinate system assigned by the element at grid points GA and GB.  See Remarks <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/19topic_20.html#ref90531');return(false);">28-2</a> and <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/19topic_20.html#ref79181');return(false);">28-3. </a> (Integers 1 through 6 with no embedded blanks, or zero or blank.) 
                     </p>
                  </td>
               </tr>
               <tr>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">ALPHA</p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Thermal expansion coefficient. (Real &gt; 0.0)</p>
                  </td>
               </tr>
            </tbody>
         </table><br></div>
      <div class="title_refCategory">Remarks: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li><a name="ref94872"></a><p class="para_item">The total number of components in CNA and CNB must equal six; for example, CNA=1236, CNB=34.  Furthermore, they must jointly be capable of representing any general rigid body motion of the element. </p>
            </li>
            <li><a name="ref90531"></a><p class="para_item">If both CMA and CMB are zero or blank, all of the degrees-of-freedom not in CNA and CNB will be made dependent; i.e., they will be made members of the m-set. </p>
            </li>
            <li><a name="ref79181"></a><p class="para_item">The m-set coordinates specified on this entry may not be specified on other entries that define mutually exclusive sets.  See <a class="links" href="javascript:void(0)" onclick="top.openFile('QRG/10ref73695_1.html');return(false);">&ldquo;Degree-of-Freedom Sets&rdquo; </a> for a list of these entries. 
               </p>
            </li>
            <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">Rigid elements, unlike MPCs, are not selected through the Case Control Section. </p>
            </li>
            <li>
               <p class="para_item">Forces of multipoint constraint may be recovered in all solution sequences, except SOL 129, with the MPCFORCE Case Control command. </p>
            </li>
            <li>
               <p class="para_item">Rigid elements are ignored in heat transfer problems. </p>
            </li>
            <li>
               <p class="para_item">See R-Type Elements&rdquo; in the <em>NX Nastran Element Library</em> for a discussion of rigid elements. 
               </p>
            </li>
         </ol>
      </div>
      <div class="title_refCategory">Remarks related to SOL 601 and 701: </div>
      <div class="refCategoryContent">
         <ol type="1" start="1">
            <li>
               <p class="para_item">For SOL 601, RBAR may be simulated by rigid link, constraint equations, beam element or spring elements depending on whether it is a large displacement analysis and the parameter EQRBAR in the NXSTRAT entry. The values of CNA, CNB, CMA, and CMB also determine how RBAR is treated. See Section 2.7 of Advanced Nonlinear Theory and Modeling Guide for details on how the RBAR element is handled. </p>
            </li>
            <li>
               <p class="para_item"> For SOL 701, RBAR is always treated as rigid, i.e., as rigid link or constraint equations. </p>
            </li>
            <li>
               <p class="para_item">No output of forces of multipoint constraint may be requested. </p>
            </li>
            <li>
               <p class="para_item">Dependent degrees-of-freedom may not be assigned as independent by another rigid element or by a multipoint constraint. An error message will be issued in such a case. </p>
            </li>
         </ol>
      </div>
   </body>
</html>