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      <title>CELAS1</title>
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      <div class="title_refTopic" id="xps10_pagetitle">CELAS1 </div>
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      <h4 class="refClassification">Scalar Spring Connection </h4>
      <p class="para_refTopic">Defines a scalar spring element. </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
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                     <p class="para_td">1 </p>
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                     <p class="para_td">2 </p>
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                     <p class="para_td">3 </p>
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                     <p class="para_td">4 </p>
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                     <p class="para_td">5 </p>
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                     <p class="para_td">6 </p>
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                     <p class="para_td">7 </p>
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                     <p class="para_td">8 </p>
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                     <p class="para_td">9 </p>
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                     <p class="para_td">10 </p>
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                     <p class="para_td">CELAS1 </p>
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                     <p class="para_td">EID </p>
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                     <p class="para_td">PID </p>
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                     <p class="para_td">G1 </p>
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                     <p class="para_td">C1 </p>
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                     <p class="para_td">G2 </p>
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                     <p class="para_td">C2 </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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      <div class="title_refCategory">Example:</div>
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                     <p class="para_td">CELAS1 </p>
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                     <p class="para_td">2 </p>
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                     <p class="para_td">6 </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">8 </p>
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                     <p class="para_td">1 </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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                     <p class="para_td">&nbsp; </p>
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      <div class="title_refCategory">Fields:</div>
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                     <p class="para_th"><b class="uiTerm">Field </b></p>
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                     <p class="para_th"><b class="uiTerm">Contents </b></p>
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                     <p class="para_td">EID </p>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Unique element identification number.  (Integer &gt; 0) </p>
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                     <p class="para_td">PID </p>
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                     <p class="para_td">Property identification number of a PELAS entry.  (Integer &gt; 0; Default = EID) </p>
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                     <p class="para_td">G1, G2 </p>
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                     <p class="para_td">Geometric grid point identification number.  (Integer &ge; 0) </p>
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                     <p class="para_td">C1, C2 </p>
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                     <p class="para_td">Component number.  (0 &le; Integer &le; 6; blank or zero if scalar point) </p>
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      <div class="title_refCategory">Remarks: </div>
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            <li>
               <p class="para_item">Scalar points may be used for G1 and/or G2, in which case the corresponding C1 and/or C2 must be zero or blank.  Zero or blank may be used to indicate a grounded terminal G1 or G2 with a corresponding blank or zero C1 or C2.  A grounded terminal is a point with a displacement that is constrained to zero.  If only scalar points and/or ground are involved, it is more efficient to use the CELAS3 entry. </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">The two connection points (G1, C1) and (G2, C2) must be distinct. </p>
            </li>
            <li>
               <p class="para_item">For a discussion of the scalar elements, see <a class="links" href="javascript:void(0)" onclick="top.popUpPage('QRG/linkInter_target_not_resolved.html#element:ref18917:-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);">&ldquo;Overview of 0D (Scalar) Elements&rdquo; </a>in the <em>NX Nastran Element Library</em>. 
               </p>
            </li>
            <li>
               <p class="para_item">A scalar point specified on this entry need not be defined on an SPOINT entry. </p>
            </li>
            <li>
               <p class="para_item">If Gi refers to a grid point, then Ci refers to degrees-of-freedom(s) in the displacement coordinate system specified by CD on the GRID entry. </p>
            </li>
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      <div class="title_refCategory">Remarks related to SOLs 601 and 701: </div>
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            <li>
               <p class="para_item">G1 and G2 must be grid points, i.e., they cannot be scalar points. </p>
            </li>
            <li>
               <p class="para_item">In SOL 701, this spring element is not considered in the critical time step size calculation because it has no mass. </p>
            </li>
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