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introduction

Strong Frame® Special Moment Frame Introduction

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<h1>Strong Frame® Special Moment Frame Introduction</h1>

<div class="row">
  <div class="col-sm-12">
    <h2>History of Special Moment Frame Development</h2>
    <p>
      Traditionally, special steel moment frames are designed so that the beam
      will yield under large displacement. The yielding of the beam section
      provides energy dissipation and is designed to ensure the beam-to-column
      connection is not compromised. The current design philosophy is the
      product of extensive testing of SMF connections from the findings of the
      1994 Northridge and 1989 Loma Prieta earthquakes in California. Figures 1,
      2 and 3 are test specimens showing yielding at designated areas of the
      beam.
    </p>
  </div>
</div>

<div class="row">
  <div class="col-sm-12 col-md-6">
    <img
      src="https://embed.widencdn.net/img/ssttoolbox/hpcmgbvt0o/500px/F-L-SF17-37a-2017.jpg"
      alt="SMF Introduction: Figure 1 &mdash; Formation of Plastic Hinge at RBS Connection"
    />
    <p>
      <strong
        >Figure 1 &mdash; Formation of Plastic Hinge at RBS Connection</strong
      >
      <br />
      <small>(Reference: Gilton, Chi and Uang, UCSD SSRP-2000/03)</small>
    </p>
  </div>
  <div class="col-sm-12 col-md-6">
    <img
      src="http://embed.widencdn.net/img/ssttoolbox/jdtpdz6dcb/500px/F-L-SFDG20-17b.jpeg"
      alt="Diagram of Steel Beam Designated Yeild Area"
    />
  </div>
</div>

<div class="row">
  <div class="col-sm-12 col-md-6">
    <img
      src="https://embed.widencdn.net/img/ssttoolbox/iidua5qgd1/500px/F-L-SF17-37c-2017.jpg"
      alt="SMF Introduction: Figure 2 &mdash; Fracture of Beam Flange Plate Moment Connection"
    />
    <p>
      <strong
        >Figure 2 &mdash; Fracture of Beam Flange Plate Moment
        Connection</strong
      >
      <br />
      <small>(Reference: Sato, Newell and Uang, UCSD SSRP-2007)</small>
    </p>
  </div>
  <div class="col-sm-12 col-md-6">
    <img
      src="https://embed.widencdn.net/img/ssttoolbox/dakr9ac3xr/500px/F-L-SF17-37d-2017.jpg"
      alt="SMF Introduction: Figure 3 &mdash; End Plate Specimen at Failure"
    />
    <p>
      <strong>Figure 3 &mdash; End Plate Specimen at Failure</strong>
      <br />
      <small>(Reference: Sumner et al. 2000)</small>
    </p>
  </div>
</div>

<div class="row">
  <div class="col-sm-12">
    <h2>
      Introduction to Simpson Strong-Tie Strong Frame&reg; Special Moment Frames
    </h2>
    <p>
      Traditional prequalified moment frames most often require a welded
      connection with either a weakened beam or a stiffened connection in order
      to allow the beam to yield as necessary during a seismic event so as to
      dissipate energy. These types of connections require that the beam be
      braced to resist the lateral torsional buckling per code. However, it is
      difficult to meet the bracing stiffness requirements with the use of
      light-framed wood members. Because of concerns about beam bracing and
      welding in wood structures, Simpson Strong-Tie designed the Strong Frame
      special moment frame (SMF) with a fieldbolted moment connection that is a
      partially restrained (Type PR) connection that uses the Yield-Link&reg;
      structural fuse for moment transfer.
    </p>
    <p>
      The yielding during a major seismic event has been moved from the beams to
      the Yield-Links, and the connection follows a capacity-based design
      approach. This allows the connection to remain elastic under factored load
      combinations, and seismic inelastic rotation demand is confined within the
      connection when yielding is experienced from severe events. With the
      yielding confined predominantly to the replaceable Yield-Link moment
      connection, inelastic behavior is not expected from the members and the
      beam can be designed without beam bracing.
    </p>
  </div>
</div>

<div class="row">
  <div class="col-sm-12 col-md-6">
    <img
      src="http://embed.widencdn.net/img/ssttoolbox/cufrig3ytq/500px/F-L-SFDG20-18a.jpeg"
      alt="SMF Introduction: Figure 3 &mdash; End Plate Specimen at Failure"
    />
    <p>
      <strong
        >The highlighted green section illustrates the yielding area on the
        Strong Frame special moment frame connection, which is a patented system
        designed to yield in a seismic event.</strong
      >
      <br />
      <small
        >(Protected by U.S. and foreign patents and other pending and granted
        foreign patents.)</small
      >
    </p>
  </div>
  <div class="col-sm-12 col-md-6">
    <img
      src="https://embed.widencdn.net/img/ssttoolbox/gugvvfoo4g/500px/F-L-SF17-38b-2017.jpg"
      alt="SMF Introduction: Figure 3 &mdash; End Plate Specimen at Failure"
    />
    <p>
      <strong>Sample Yield-Link Compression and Elongation from Testing</strong>
    </p>
  </div>
</div>

<div class="row">
  <div class="col-sm-12">
    <h2>Special Moment Frame Applications</h2>
    <p>
      There are several benefits to using the Simpson Strong-Tie Yield-Link&reg;
      moment connection for new and retrofit projects. In new construction, the
      frame can be incorporated into the early stages of design. Simpson
      Strong-Tie can provide design options for the customer without charge. The
      field-bolted connections allow for quicker frame erection and
      installation. In retrofit designs, the bolted connection means the frame
      can be erected in the interior conditions of light-frame construction
      without the risk of fire. The beam and columns can be erected in parts,
      making the SMF much easier to handle than a fully welded frame.
    </p>
  </div>
</div>

<div class="row">
  <div class="col-sm-12 col-md-6">
    <h2>Prequalified Connections</h2>
    <p>
      Prequaliﬁed moment connections are structural steel moment connection
      conﬁgurations and details that have been reviewed by the AISC Connection
      Prequaliﬁcation Review Panel (CPRP) and incorporated into the AISC 358-16
      standard. The criteria for prequaliﬁcation are spelled out in the AISC
      seismic provisions, AISC 341. In short, AISC 341 contains performance and
      testing requirements that have been shown to produce robust moment
      connections, and AISC 358 includes connection details that meet those
      criteria. AISC 358-16 Prequalified Connections include the Simpson
      Strong-Tie Strong Frame moment connection in Chapter 12.
    </p>
  </div>
  <div class="col-sm-12 col-md-6">
    <img
      src="http://embed.widencdn.net/img/ssttoolbox/hhzv0kmpmg/500px/F-L-SFDG20-19a.jpeg"
      alt="Prequalified Connections"
    />
  </div>
</div>

<div class="row">
  <div class="col-sm-12 col-md-8">
    <h2>
      Strong Frame Special Moment Frame and Yield-Link Are Listed in ANSI/AISC
    </h2>
    <p>
      Strong Frame special moment frame and the Yield-Link structural fuse are
      included in ANSI/AISC 358-16, prequalified connections for Special and
      Intermediate Steel Moment Frames for Seismic Applications, Chapter 12.
    </p>
    <a
      class="button"
      href="https://www.aisc.org/globalassets/aisc/publications/standards/a358-20w.pdf"
      target="_blank"
    >
      <span class="icon-arrow-right-lg"></span>Read ANSI/AISC 358-16
    </a>
  </div>
  <div class="col-sm-12 col-md-4">
    <p>
      <img
        alt="AISC"
        src="https://embed.widencdn.net/img/ssttoolbox/ruf3warfye/exact/aisc_logo-180.png"
      />
    </p>
  </div>
</div>

<div class="row">
  <div class="col-sm-12 col-md-6">
    <h2>Strong Frame Moment Frame Code Reports</h2>
    <p>
      Strong Frame moment frames are code listed under the 2009, 2012, 2015 and
      2018 IRC/IBC and ESR-2802 with LABC Supplement.
    </p>
  </div>
  <div class="col-sm-12 col-md-6">
    <img
      src="http://embed.widencdn.net/img/ssttoolbox/wca7nwxvoo/500px/F-L-SFDG20-19c.jpeg"
      alt="Strong Frame Moment Frame Code Reports"
    />
  </div>
</div>

<div class="row">
  <div class="col-sm-12 col-md-6">
    <a
      href="/search?v=%3Arelevance%3AapprovalProductLine%3AStrong+Frame%C2%AE+Moment+Frames&tab=compliance"
      class="button"
    >
      <span class="icon-arrow-right-lg"></span>View SMF Code Reports
    </a>
  </div>
</div>

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