{"id":7778,"date":"2008-11-01T15:30:56","date_gmt":"2008-11-01T15:30:56","guid":{"rendered":"http:\/\/www.newsteelconstruction.com\/wp\/?p=7778"},"modified":"2012-08-10T15:35:43","modified_gmt":"2012-08-10T15:35:43","slug":"ad-328-length-of-slotted-holes-and-kidney-shaped-slots","status":"publish","type":"post","link":"https:\/\/www.newsteelconstruction.com\/wp\/ad-328-length-of-slotted-holes-and-kidney-shaped-slots\/","title":{"rendered":"AD 328: Length of slotted holes and kidney-shaped slots"},"content":{"rendered":"<div id=\"attachment_7779\" style=\"width: 253px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/www.newsteelconstruction.com\/wp\/wp-content\/uploads\/2012\/08\/ADfig1.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-7779\" class=\"size-full wp-image-7779 \" title=\"ADfig1\" src=\"http:\/\/www.newsteelconstruction.com\/wp\/wp-content\/uploads\/2012\/08\/ADfig1.jpg\" alt=\"\" width=\"243\" height=\"134\" \/><\/a><p id=\"caption-attachment-7779\" class=\"wp-caption-text\">Figure 1a: Slotted hole<\/p><\/div>\n<p>The purpose of this AD Note is to clarify the definition of the length of slotted holes and kidney shaped holes. The need for clarification has arisen because some designers have been using a value other than that intended.<\/p>\n<p>In BS 5959-1:2000, Tables 33 and 36 give the standard dimensions of holes for non-preloaded and preloaded bolts respectively. The tables include values for the dimension \u201clength\u201d of slotted holes and kidney-shaped slots. The \u201clength\u201d of the slotted hole given in those Tables is intended to mean the overall length of the physical hole, as shown below for both slotted holes and kidney-shaped slots.\u00a0 In support of this meaning, the same definition can also be found on page 8-213 of the second edition of the AISC \u201cManual of Steel Construction, Load &amp; resistance factor design, volume II, Connections\u201d.<\/p>\n<div id=\"attachment_7780\" style=\"width: 213px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/www.newsteelconstruction.com\/wp\/wp-content\/uploads\/2012\/08\/ADfig2.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-7780\" class=\"size-full wp-image-7780 \" title=\"ADfig2\" src=\"http:\/\/www.newsteelconstruction.com\/wp\/wp-content\/uploads\/2012\/08\/ADfig2.jpg\" alt=\"\" width=\"203\" height=\"185\" \/><\/a><p id=\"caption-attachment-7780\" class=\"wp-caption-text\">Figure 1b: Kidney-shaped slot (from SCI-P212, Figure 9.2)<\/p><\/div>\n<p>The misinterpretation seems to have arisen when the distance between the centres of the circles at the ends of the slots (which is a dimension given in some software) is used instead of the correct definition.\u00a0 Designers should take care not to use the wrong dimension, because that might result in long slots greater than the limiting value or in classifying a long slot as a short slot (and thus giving an unsafe value of bearing and slip resistance).<\/p>\n<p><strong>Contact: <\/strong>Abdul Malik<br \/>\n<strong>Tel:<\/strong> 01344 636525<br \/>\n<strong>Email:<\/strong> <a href=\"mailto:advisory@steel-sci.com\">advisory@steel-sci.com<\/a><\/p>\n<div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The purpose of this AD Note is to clarify the definition of the length of slotted holes and kidney shaped holes. The need for clarification has arisen because some designers have been using a value other than that intended. In BS 5959-1:2000, Tables 33 and 36 give the standard dimensions of holes for non-preloaded and [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[79],"tags":[82],"class_list":["post-7778","post","type-post","status-publish","format-standard","hentry","category-ad","tag-advisory-desk"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p3WsLP-21s","_links":{"self":[{"href":"https:\/\/www.newsteelconstruction.com\/wp\/wp-json\/wp\/v2\/posts\/7778","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsteelconstruction.com\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsteelconstruction.com\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsteelconstruction.com\/wp\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsteelconstruction.com\/wp\/wp-json\/wp\/v2\/comments?post=7778"}],"version-history":[{"count":5,"href":"https:\/\/www.newsteelconstruction.com\/wp\/wp-json\/wp\/v2\/posts\/7778\/revisions"}],"predecessor-version":[{"id":7785,"href":"https:\/\/www.newsteelconstruction.com\/wp\/wp-json\/wp\/v2\/posts\/7778\/revisions\/7785"}],"wp:attachment":[{"href":"https:\/\/www.newsteelconstruction.com\/wp\/wp-json\/wp\/v2\/media?parent=7778"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsteelconstruction.com\/wp\/wp-json\/wp\/v2\/categories?post=7778"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsteelconstruction.com\/wp\/wp-json\/wp\/v2\/tags?post=7778"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}