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      <title>RIGID</title>
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      <div class="title_refTopic" id="xps10_pagetitle">RIGID </div>
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      <h4 class="refClassification">Rigid Element Method</h4>
      <p class="para_refTopic">Selects the rigid element processing method for RBAR, RBE1, RBE2, RROD and RTRPLT elements.</p>
      <div class="title_refCategory">Format: </div>
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      <div class="title_refCategory">Examples: </div>
      <div class="refCategoryContent"><pre class="indent">RIGID=LAGRAN</pre></div>
      <div class="title_refCategory">Describers:</div>
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                     <p class="para_th"><b class="uiTerm">Describer </b></p>
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                     <p class="para_th"><b class="uiTerm">Meaning </b></p>
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                     <p class="para_td">LINEAR</p>
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                     <p class="para_td">Selects the linear elimination method.</p>
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                     <p class="para_td">LAGRAN</p>
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                     <p class="para_td">Selects the Lagrange multiplier method.</p>
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      <div class="title_refCategory">Remarks: </div>
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               <p class="para_item">The RIGID command must be above the SUBCASE level.</p>
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               <p class="para_item">The LAGRAN method allows for the thermal expansion of the rigid elements. </p>
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               <p class="para_item">The RIGID command can only be used in SOLs 101 through 112. For all other solution sequences, RIGID command is ignored and RIGID=LINEAR is used.</p>
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               <p class="para_item">If the RIGID command is not specified, RIGID=LINEAR is used.</p>
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            <li>
               <p class="para_item">LINEAR processing will not compute the thermal loads. Also, in SOLs 103 through 112, LAGRAN method must be used to compute the differential stiffness due to the thermal expansion of the rigid elements.</p>
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            <li>
               <p class="para_item">When using RIGID=LAGRAN, K6ROT must be defined as non-zero.</p>
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