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top-plate-to-stud-rotation-restraint

Top-Plate-to-Stud Rotation Restraint

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<h1>Top-Plate-to-Stud Rotation Restraint</h1>
  <p>The roof-structure-to-top-plate connection induces eccentric loads to the top plate. This will require a top-plate-to-stud connection to continue the load path and prevent torsional rotation of the top plates. Simpson Strong-Tie offers a variety of product options to resist the rotational forces from the roof structure.</p>

  <div class="image">
    <img alt="Top Plate to Stud Lineup" src="https://embed.widencdn.net/img/ssttoolbox/8sddc8v11s/1000px/top-plate-to-stud-lineup.jpg?q=40">
    <div class="image-caption">
      Truss-to-plate connections not shown for clarity. However, they need to be installed on the same side of the wall as plate-to-stud connectors.
    </div>
  </div>

  <table class="table-responsive-sm">
    <thead>
      <tr>
        <th>AC391 Criteria Section</th>
        <th>AC391 Requirement</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>3.2.2.3</td>
        <td class="la">Top-plate torsion (rotation) must be prevented due to offsets between the point of load application, such as hurricane ties at the sides of the top plates and load resistance (rods at the center of the top plate for example). This can be accomplished by providing a positive connection from the top plate to stud on the same side of the wall as the roof framing to wall connection.</td> 
      </tr>
    </tbody>
  </table>

  <div class="image">
    <img alt="Stud-to-Plate Tie Reaction" src="https://embed.widencdn.net/img/ssttoolbox/a0bziedzyv/400px/F-L-SRS18-055b-stud-to-plate-tie-reaction.png">
    <div class="image-caption">Stud-to-Plate Tie Reaction</div>
  </div>
<br>
  <div class="row">
    <div class="col-md-6 col-sm-6">
      <div class="image">
        <img alt="Top-Plate Rotation Failure Due to Uplift" src="https://embed.widencdn.net/img/ssttoolbox/l0xbnawvnp/1400px/SR_SR_SitPho_Pho_Instld_CRTS-Rod-Systems-Top-Plate-Rotation_C0.jpg?q=40">
        <div class="image-caption">Top-Plate Rotation Failure Due to Uplift</div>
      </div>
    </div>
    <div class="col-md-6 col-sm-6">
      <div class="image">
        <img alt="Ultimate Failure of Top Plate in Pure Bending Due to Rotation Restraint" src="https://embed.widencdn.net/img/ssttoolbox/iqu4yel2nx/700px/SR_SR_SitPho_Pho_Instld_CRTS-Rod-Systems-Top-Plate-Rotation-Restraint_C0.jpg?q=40">
        <div class="image-caption">Ultimate Failure of Top Plate in Pure Bending Due to Rotation Restraint</div>
      </div>
    </div>
  </div>
<br>
  <p>When connection hardware between the roof framing members and the wall top plate induces eccentric loading about the centerline of the top plate, Simpson Strong-Tie top-plate-to-stud connectors are the optimum installation solution to prevent top-plate rotation as shown in illustration below. The top-plate-to-stud connectors must be installed on the same side of the top plate as the roof-to-wall connectors. Connector models must be selected and installed in a manner that does not induce significant tension stresses perpendicular to the grain of the wood top-plate members.</p>

  <div class="row">
    <div class="col-md-6">
      <h3>Required Top-Plate Rotation Restraint Connection Force<sup>1</sup></h3>
      <img alt="Required Top Plate Rotation Restraint Connection Force" src="https://embed.widencdn.net/img/ssttoolbox/bufukuobmy/700px@2x/F-L-SRS18-056a.png">
      <p>For SI:1 inch = 25.4mm</p>
      <ol>
        <li>The top-plate-to-stud connection used to restrain top plate rotation must be installed on the same side of the wall as the roof-to-top-plate connection.</li> 
      </ol>
    </div>
    <div class="col-md-6">
      <div class="image">
        <img alt="Top-Plate Rotation Restraint Connection Force" src="https://embed.widencdn.net/img/ssttoolbox/xjfzjws4t2/700px/F-L-SRS18-056a-top-plate-rotation-restraint-connection-force.png">
        <div class="image-caption">Top-Plate Rotation Restraint Connection Force</div>
      </div>
    </div>
  </div>

  <div class="row">
    <div class="col-md-12">
      <p>For hurricane tie components that can connect top plates to studs to resist rotation, refer to the <a href="/resources/literature/high-wind-product-guide">High Wind Guide (F&#8209;C&#8209;HWG)</a> or the <a href="/resources/literature/wood-construction-connectors-catalog">Wood Construction Connectors catalog</a>.</p>
    </div>
  </div>

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