Behavior and Design of Cast-in-Place Anchors under Simulated Seismic Loading (NEES-2009-0725)

By Jian Zhao1, Bahram Shahrooz2

1. University of Wisconsin-Milwaukee 2. University of Cincinnati

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Abstract

Title: Behavior and Design of Cast-in-Place Anchors under Simulated Seismic Loading (NEES-2009-0725)

Year Of Curation: 2013

Description: Headed anchors/studs are commonly used in structures to connect steel members (e.g., columns, girders, or braces) and concrete elements (e.g., foundations, walls, or columns, respectively). The concrete elements may experience substantial damage (e.g., large cracking) during an earthquake. Understanding the behavior of anchors in cracked concrete is a prerequisite to ensuring satisfactory seismic performance and safety of structures. Current seismic design guidelines, represented by Appendix D of the American Concrete Institute 318-05 document, are not adequate for the design of headed anchors/studs in significantly cracked concrete. The design provisions tacitly rely on reserved capacity of anchors and perceived ductile failure modes due to steel fracture. Both of these rationales are questionable because of the limited data for anchor behavior under seismic loading. In addition, the interaction equations for anchors under combined cyclic tension-shear have not been verified experimentally. As a result, many anchor connections, including those taking advantage of additional reinforcement around the anchors, are often implemented in practice without supporting experimental data. The knowledge gap is due partly to the limited experimental equipment available for such testing before the NEES facilities became operational in 2004. This project will investigate the fundamental behavior of headed anchors/studs under simulated seismic loading and verify and improve the anchor connection details commonly seen in practice. The project will develop connection interface models to improve model-based simulations and to assist in the development of performance-based engineering methodologies. Particularly, this research clarifies the current capacity design philosophy, redefines the definition of ductile failure modes, and evaluates the interaction equation for anchors under cyclic tension-shear. The research also explores extending the existing design equations to anchors embedded in concrete members that may experience significant damage. With the fundamental knowledge on single anchor behavior under seismic load, two typical anchor connections, which have been used in practice without justification, will be evaluated experimentally, and connection details with improved performance characteristics will be developed and verified. Recommendations for effective use of supplemental reinforcement for improving the capacity and ductility of anchor connections will be made, and design guidelines, along with examples, will be generated for engineers.

Award: http://www.nsf.gov/awardsearch/showAward?AWD_ID=0724097

PIs & CoPIs: Jian Zhao, Bahram Shahrooz

Dates: October 01, 2007 - July 31, 2013

Organizations: University of Cincinnati, OH, United States,    University of Wisconsin-Milwaukee, WI, United States

Facilities: University of Wisconsin-Milwaukee, WI, United States,    University of Illinois at Urbana-Champaign, IL, United States

Sponsor: NSF - 0724097 

Keywords: headed stud,anchor,fastening to concrete,column connections,Anchor reinforcement,composite construction

Publications:
"NEES Phase III experimental program"
"NEES-Anchor Final Report Vol I"
"NEES-Anchor Final Report Vol II"

Cite this work

Researchers should cite this work as follows:

  • Jian Zhao; Bahram Shahrooz (2017), "Behavior and Design of Cast-in-Place Anchors under Simulated Seismic Loading (NEES-2009-0725)," https://datacenterhub.org/resources/14660.

    BibTex | EndNote

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OTHER Tables:
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      SET `data` = '__default|a:9:{s:15:\"session.counter\";i:1;s:19:\"session.timer.start\";i:1594178509;s:18:\"session.timer.last\";i:1594178509;s:17:\"session.timer.now\";i:1594178509;s:8:\"registry\";O:23:\"Hubzero\\Config\\Registry\":2:{s:7:\"\0*\0data\";O:8:\"stdClass\":2:{s:1:\"0\";s:7:\"session\";s:10:\"Components\";O:8:\"stdClass\":1:{s:9:\"Resources\";O:8:\"stdClass\":2:{s:6:\"Models\";O:8:\"stdClass\":1:{s:6:\"Author\";O:8:\"stdClass\":2:{s:7:\"orderby\";s:8:\"ordering\";s:8:\"orderdir\";s:3:\"asc\";}}s:7:\"Reviews\";O:8:\"stdClass\":1:{s:6:\"Models\";O:8:\"stdClass\":1:{s:6:\"Review\";O:8:\"stdClass\":2:{s:7:\"orderby\";s:7:\"created\";s:8:\"orderdir\";s:4:\"desc\";}}}}}}s:9:\"separator\";s:1:\".\";}s:4:\"user\";C:17:\"Hubzero\\User\\User\":22:{a:1:{s:5:\"guest\";b:1;}}s:11:\"tracker.sid\";s:32:\"5a499e5a8ed098c0f970e77afc4722d0\";s:12:\"tracker.ssid\";s:32:\"5a499e5a8ed098c0f970e77afc4722d0\";s:12:\"tracker.rsid\";s:32:\"5a499e5a8ed098c0f970e77afc4722d0\";}',`time` = '1594178509',`ip` = '34.231.109.238'
  2. 1 × SHOW FULL COLUMNS
      FROM `jos_resource_assoc
  3. 1 × INSERT INTO `jos_session` (`session_id`,`client_id`,`time`,`ip`)
      VALUES ('5a499e5a8ed098c0f970e77afc4722d0','0','1594178509','34.231.109.238'
  4. 1 × DELETE
      FROM `jos_session`
  • onAfterInitialise Method plgSystemP3p::onAfterInitialise /core/plugins/system/p3p/p3p.php:21
  • onAfterInitialise Method plgSystemRemember::onAfterInitialise /core/plugins/system/remember/remember.php:20
  • onAfterInitialise Method plgSystemHubzero::onAfterInitialise /core/plugins/system/hubzero/hubzero.php:21
  • onAfterInitialise Method plgSystemXFeed::onAfterInitialise /core/plugins/system/xfeed/xfeed.php:21
  • onAfterInitialise Method plgSystemSupergroup::onAfterInitialise /core/plugins/system/supergroup/supergroup.php:113
  • onAfterInitialise Method plgSystemReferrerpolicy::onAfterInitialise /core/plugins/system/referrerpolicy/referrerpolicy.php:21
  • onAfterRoute Method plgSystemJquery::onAfterRoute /core/plugins/system/jquery/jquery.php:21
  • onAfterRoute Method plgSystemSpamjail::onAfterRoute /core/plugins/system/spamjail/spamjail.php:21
  • onAfterRoute Method plgSystemPassword::onAfterRoute /core/plugins/system/password/password.php:21
  • onAfterRoute Method plgSystemIncomplete::onAfterRoute /core/plugins/system/incomplete/incomplete.php:21
  • onAfterRoute Method plgSystemUnconfirmed::onAfterRoute /core/plugins/system/unconfirmed/unconfirmed.php:21
  • onAfterRoute Method plgSystemUnapproved::onAfterRoute /core/plugins/system/unapproved/unapproved.php:21
  • onResourcesAreas Method plgResourcesAbout::onResourcesAreas /core/plugins/resources/about/about.php:32
  • onResourcesAreas Method plgResourcesReviews::onResourcesAreas /core/plugins/resources/reviews/reviews.php:43
  • onResourcesAreas Method plgResourcesUsage::onResourcesAreas /core/plugins/resources/usage/usage.php:29
  • onResourcesAreas Method plgResourcesVersions::onResourcesAreas /core/plugins/resources/versions/versions.php:29
  • onResourcesAreas Method plgResourcesShare::onResourcesAreas /core/plugins/resources/share/share.php:29
  • onResourcesAreas Method plgResourcesCitations::onResourcesAreas /core/plugins/resources/citations/citations.php:29
  • onResourcesAreas Method plgResourcesQuestions::onResourcesAreas /core/plugins/resources/questions/questions.php:29
  • onResourcesAreas Method plgResourcesSupportingDocs::onResourcesAreas /core/plugins/resources/supportingdocs/supportingdocs.php:30
  • onResourcesAreas Method plgResourcesWishlist::onResourcesAreas /core/plugins/resources/wishlist/wishlist.php:29
  • onResourcesAreas Method plgResourcesFindThisText::onResourcesAreas /core/plugins/resources/findthistext/findthistext.php:29
  • onResourcesAreas Method plgResourcesWindowstools::onResourcesAreas /core/plugins/resources/windowstools/windowstools.php:214
  • onContentPrepare Method plgContentLoadmodule::onContentPrepare /core/plugins/content/loadmodule/loadmodule.php:35
  • onContentPrepare Method plgContentEmailcloak::onContentPrepare /core/plugins/content/emailcloak/emailcloak.php:25
  • onContentPrepare Method plgContentPagebreak::onContentPrepare /core/plugins/content/pagebreak/pagebreak.php:35
  • onContentPrepare Method plgContentXhubtags::onContentPrepare /core/plugins/content/xhubtags/xhubtags.php:25
  • onContentPrepare Method plgContentFormathtml::onContentPrepare /core/plugins/content/formathtml/formathtml.php:105
  • onContentPrepare Method plgContentExternalhref::onContentPrepare /core/plugins/content/externalhref/externalhref.php:41
  • onResources Method plgResourcesAbout::onResources /core/plugins/resources/about/about.php:54
  • onResources Method plgResourcesReviews::onResources /core/plugins/resources/reviews/reviews.php:91
  • onResources Method plgResourcesUsage::onResources /core/plugins/resources/usage/usage.php:51
  • onResources Method plgResourcesVersions::onResources /core/plugins/resources/versions/versions.php:50
  • onResources Method plgResourcesShare::onResources /core/plugins/resources/share/share.php:50
  • onResources Method plgResourcesCitations::onResources /core/plugins/resources/citations/citations.php:51
  • onResources Method plgResourcesQuestions::onResources /core/plugins/resources/questions/questions.php:60
  • onResources Method plgResourcesSupportingDocs::onResources /core/plugins/resources/supportingdocs/supportingdocs.php:52
  • onResources Method plgResourcesWishlist::onResources /core/plugins/resources/wishlist/wishlist.php:50
  • onResources Method plgResourcesFindThisText::onResources /core/plugins/resources/findthistext/findthistext.php:51
  • onResources Method plgResourcesWindowstools::onResources /core/plugins/resources/windowstools/windowstools.php:235
  • onResources Method plgResourcesGooglescholar::onResources /core/plugins/resources/googlescholar/googlescholar.php:25
  • onResources Method plgResourcesOpengraph::onResources /core/plugins/resources/opengraph/opengraph.php:25
  • onResources Method plgResourcesDublincore::onResources /core/plugins/resources/dublincore/dublincore.php:25
  • onResources Method plgResourcesCoins::onResources /core/plugins/resources/coins/coins.php:25
  • onResourcesSub Method plgResourcesGroups::onResourcesSub /core/plugins/resources/groups/groups.php:45
  • onResourcesSub Method plgResourcesRelated::onResourcesSub /core/plugins/resources/related/related.php:45
  • onResourcesSub Method plgResourcesSponsors::onResourcesSub /core/plugins/resources/sponsors/sponsors.php:45
  • onResourcesSub Method plgResourcesWatch::onResourcesSub /core/plugins/resources/watch/watch.php:46
  • onResourcesSub Method plgResourcesCollections::onResourcesSub /core/plugins/resources/collections/collections.php:31
  • onAfterDispatch Method plgSystemDebug::onAfterDispatch /core/plugins/system/debug/debug.php:60
  • onAfterDispatch Method PlgSystemHighlight::onAfterDispatch /core/plugins/system/highlight/highlight.php:25
  • onAfterRender Method plgSystemSef::onAfterRender /core/plugins/system/sef/sef.php:21