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      <title>GPFORCE</title>
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      <div class="title_refTopic" id="xps10_pagetitle">GPFORCE </div>
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      <h4 class="refClassification">Grid Point Force Output Request </h4>
      <p class="para_refTopic">Requests grid point force balance at selected grid points. </p>
      <div class="title_refCategory">Format: </div>
      <div class="refCategoryContent">
         <p align="center"><img align="bottom" src="graphics/casecontrol4a-ufig29.gif"></p>
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      <div class="title_refCategory">Examples: </div>
      <div class="refCategoryContent"><pre class="indent">GPFORCE=ALL
GPFORCE=17</pre></div>
      <div class="title_refCategory">Describers:</div>
      <div class="refCategoryContent">
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                  <th align="left" colspan="1" rowspan="1">
                     <p class="para_th"><b class="uiTerm">Describer </b></p>
                  </th>
                  <th align="left" colspan="1" rowspan="1">
                     <p class="para_th"><b class="uiTerm">Meaning </b></p>
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                     <p class="para_td">PRINT </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">The printer will be the output medium. </p>
                  </td>
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                     <p class="para_td">PUNCH </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">The punch file will be the output medium. </p>
                  </td>
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                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">ALL </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Grid point force balance for all grid points will be output. </p>
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                     <p class="para_td">n </p>
                  </td>
                  <td align="left" colspan="1" rowspan="1" valign="top">
                     <p class="para_td">Set identification number of a previously appearing SET command.  Only grid points with identification numbers that appear on this SET command will be included in the grid point force balance output.  (Integer&gt;0) </p>
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      <div class="title_refCategory">Remarks: </div>
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         <ol type="1" start="1">
            <li>
               <p class="para_item">The printing of the grid point forces will be suppressed if PARAM,NOGPF,-1 appears in the Bulk Data. </p>
            </li>
            <li>
               <p class="para_item">The Bulk Data entry PARAM,NOELOF,+1 will cause the output of the grid point forces to be aligned with the edges of the two-dimensional elements.  The default value of -1 will suppress this output. </p>
            </li>
            <li>
               <p class="para_item">The Bulk Data entry PARAM,NOELOP,+1 will cause the output of the sum of the forces parallel to the edges of adjacent elements.  The default value of -1 will suppress this output. </p>
            </li>
            <li>
               <p class="para_item">The output of grid point forces aligned with the edges of elements is available for the following elements: </p><pre class="indent">CBAR
CROD
CBEAM
CSHEAR
CONROD
CTRIA3</pre><p class="para_item">The positive direction for grid point forces aligned with the edges of elements is from the reference point to the load point as indicated on the printed output. </p>
            </li>
            <li>
               <p class="para_item">Grid point force balance is computed from linear and nonlinear elements, the sum of applied and thermal loads, and MPC and SPC forces.  Effects not accounted for include those from mass elements in dynamic analysis (inertia loads), general elements, DMIG entries, and boundary loads from upstream superelements.  These effects may lead to an apparent lack of equilibrium at the grid point level.  The following table summarizes those effects that are considered and those effects that are ignored in the calculation of grid point forces in the global coordinate system: </p>
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                           <p class="para_th"><b class="uiTerm">Contributions Included </b></p>
                        </th>
                        <th align="center" colspan="1" rowspan="1">
                           <p class="para_th"><b class="uiTerm">Contributions Ignored </b></p>
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                           <p class="para_td">Applied Loads </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">GENEL Forces </p>
                        </td>
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                           <p class="para_td">SPC Forces </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">DMIG and DMI Forces </p>
                        </td>
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                           <p class="para_td">Element Elastic Forces </p>
                        </td>
                        <td align="left" colspan="1" rowspan="1" valign="top">
                           <p class="para_td">Boundary Loads from Upstream Superelements </p>
                        </td>
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                           <p class="para_td">Thermal Loads </p>
                        </td>
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                           <p class="para_td">&nbsp; </p>
                        </td>
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                           <p class="para_td">MPC and Rigid Element Forces </p>
                        </td>
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                           <p class="para_td">&nbsp; </p>
                        </td>
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               </table><br></li>
            <li>
               <p class="para_item">Only the element elastic forces are included when the grid point forces are aligned with the edges of elements. </p>
            </li>
            <li>
               <p class="para_item">In inertia relief analysis, the GPFORCE output related to SPCFORCES and applied loads is interpreted differently for SOLs 1, 101, and 200: </p>
               <ul>
                  <li>
                     <p class="para_item">In SOL 1, the SPCFORCE and applied load output does not reflect the effects due to inertial loads. </p>
                  </li>
                  <li>
                     <p class="para_item">In SOLs 101 and 200, the SPCFORCE and applied load output includes both the effect of inertial loads and applied loads. </p>
                  </li>
               </ul>
            </li>
            <li>
               <p class="para_item">When pressure loads are applied, the GPFDR module uses the discrete load vector and does not include any distributed effects. </p>
            </li>
            <li>
               <p class="para_item">Grid point force output is not available for frequency response analysis (SOL 108 and 111).</p>
            </li>
            <li>
               <p class="para_item">Grid point force output is available for nonlinear static analysis (SOL 106). All other nonlinear solution sequences do not support grid point force output. PARAM,NOELOF and PARAM,NOELOP are not supported in nonlinear static analysis; therefore, Remarks 2, 3, 4, and 6 do not apply to SOL 106. </p>
            </li>
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