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types

Different Types of Moment Frames

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<div class="row">
  <div class="col-sm-12">
 <h1>Steel Types</h1>
    <p>
      When it comes to steel moment frames, there are three types of frames
      defined in the code &mdash; ordinary moment frames (OMF), intermediate
      moment frames (IMF) and special moment frames (SMF). They are listed in
      the table below along with their Response Modification Coefficient
      (R-value), Overstrength Factor (&Omega;&omicron;), and Deflection
      Amplification Factor (C<sub>d</sub>) per ASCE 7.
    </p>
  </div>

  <div class="col-sm-12">
    <h4>For Steel Moment Frames</h4>
    <br>
    <img height="150" 
      src="http://embed.widencdn.net/img/ssttoolbox/7ycmsrkddk/500px/015a-2017.jpeg"
      alt="Steel Moment Frames Specifications Diagram"
    />
  </div>
</div>
<br>
<div class="row">
  <div class="col-sm-12">
    <p>
      Typically OMF are used in wind regions, where a stiff, non-yielding frame
      is desired. SMF are typically used in seismic regions where more ductility
      is needed. Graphics below illustrate the difference in ductility between
      the three moment frame types.
    </p>
  </div>

  <div class="col-sm-12">
    <img
      src="http://embed.widencdn.net/img/ssttoolbox/wsn5hze7bs/500px/F-L-SFDG20-15b-2020.jpeg"
      alt="Moment Frame Comparison Chart"
    />
  </div>
</div>
<br>
<div class="row">
  <div class="col-sm-6 col-md-4">
    <div>
      <h2>OMF</h2>
      <ul>
        <li>Expected to withstand limited inelastic deformations</li>
        <li>Doesn&rsquo;t require use of prequalified connections per AISC</li>
        <li>Not required to be tested</li>
        <li>Typically used in non/low-seismic regions</li>
      </ul>
    </div>
  </div>

  <div class="col-sm-6 col-md-4">
    <div>
      <h2>IMF</h2>
      <ul>
        <li>Expected to withstand moderate inelastic deformations</li>
        <li>Require use of prequalified connections per AISC</li>
        <li>Must sustain inter-story drift angle of at least 0.02 radians</li>
        <li>Typically used in low/mid-seismic regions</li>
      </ul>
    </div>
  </div>

  <div class="col-sm-6 col-md-4">
    <div>
      <h2>SMF</h2>
      <ul>
        <li>Expected to withstand significant inelastic deformations</li>
        <li>
          Require use of prequalified connections per AISC or verified with
          testing
        </li>
        <li>Must sustain inter-story drift angle of at least 0.04 radians</li>
        <li>Typically used in mid/high-seismic regions</li>
      </ul>
    </div>
  </div>
</div>

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