[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-268618-105":3,"doc-detail-268618-en":73,"detail-sidebar-cat-0-en-105":90},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":66,"head_meta":68,"extra_data":70,"updated_unix":72},105,"en","joints-with-dowel-type-fasteners-in-clt-structures-research-findings-and-calculation-proposals","Joints with Dowel Type Fasteners in CLT Structures - Research Findings and Calculation Proposals","","Load carrying capacity of joints with dowel type fasteners in cross laminated timber (CLT) is examined through experimental studies addressing embedment, withdrawal, and connection behavior. The work evaluates the effects of load duration and climate variation, supported by long-term screw tests conducted between 2007 and 2012. Based on measured results, characteristic-value proposals are derived and calculation models are developed for plane-side and edge joints, including long-term screw behavior.",{"@graph":14,"@context":65},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/research-report/","Research & Report",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/joints-with-dowel-type-fasteners-in-clt-structures-research-findings-and-calculation-proposals/268618/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/joints-with-dowel-type-fasteners-in-clt-structures-research-findings-and-calculation-proposals/268618.png","ImageObject",300,407,{"name":42,"@type":43},"Theodora","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-28","2026-09-15",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",12,{"@type":57,"mainEntity":58},"FAQPage",[59],{"name":60,"@type":61,"acceptedAnswer":62},"What outputs does the paper provide for engineering calculations?","Question",{"text":63,"@type":64},"It discusses embedment, withdrawal, and connection test results and provides proposals for characteristic values, leading to calculation models for load carrying capacity of joints for plane side and edge configurations.","Answer","https://schema.org",{"og:url":32,"og:type":67,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":69,"canonical":32},"index,follow",{"doc_id":71,"site_id":7},268618,1789433384,{"code":4,"msg":74,"data":75},"success",{"doc_id":71,"user_id":76,"nickname":42,"user_avatar":77,"doc_module":4,"category_id":78,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":79,"file_id":80,"file_url":81,"file_type":82,"file_size":83,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":84,"language":85,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":86,"faqs":87,"seo_title":88,"seo_description":12,"update_tm":72,"read_time":89,"preview_page_count":4},687197207919,"https://ap-avatar.wpscdn.com/avatar/a000253d6f5f7c60be?x-image-process=image/resize,m_fixed,w_180,h_180&k=1779446848396160552",8,"Joints with Dowel Type Fasteners in CLT Structures  \nThomas Uibel  \nProfessor for Timber Structures and Basics of Structural Engineering Timber Engineering Group, Faculty of Civil Engineering, FH Aachen  \nAachen, Germany  \nHans Joachim Blaß  \nProfessor for Timber Engineering and Building Construction Versuchsanstalt für Stahl, Holz und Steine, Karlsruhe Institute of Technology (KIT)  \nKarlsruhe, Germany  \nSummary  \nThe load carrying capacity of joints with dowel type fasteners in cross laminated timber (CLT) was the focus of a research project [1], [2],[3] conducted by the authors at Karlsruhe Institute of Technology (KIT) . To examine the influence of load duration and climate variation on the load carrying capacity, these studies were complemented by long-term tests with screws in CLT, started in 2007 and finished at the end of 2012.  \nIn this paper the results of embedment tests, withdrawal tests and connection tests are discussed and proposals for the calculation of characteristic values are given. On this basis calculation models for the load carrying capacity of joints with dowel type fasteners in the plane side of cross laminated timber and for edge joints were developed. Furthermore long-term tests with screws arepresented.  \n1. Introduction  \nCross laminated timber (CLT) has been used more and more frequently in timber engineering in recent years. Their use in constructions requires their connection with each other and with other components of the construction. To that purpose dowel type fasteners can be used. It is possible to position the fasteners perpendicular to the plane of the CLT panels or in the edges (Fig. 1) . To calculate the load carrying capacity of dowel type fasteners according to Johansen’s yield theory [4], [5], [6], [7] the yield moment of the fasteners and the embedding strength are needed. The withdrawal strength is necessary to calculate the load carrying capacity of axially loaded screws. In addition, the withdrawal strength is important for estimating the rope effect of laterally loaded connections. In the edges of CLT the fasteners can be positioned parallel to the grain direction. The embedment strength and the withdrawal strength are also influenced by gaps and grooves. The aim of the research project at the KIT [1], [2], [3] was to develop proposals for calculating the load carrying capacity of joints with dowel type fasteners in solid wood panels. Furthermore the long-term behaviour of edge joints with self-tapping screws was examined.  \nFig. 1 Opened connection with dowels in cross laminated timber (left), example for an edge joint with self-tapping screws in cross laminated timber (right)  \n2. Test material  \nCross laminated timber panels consist of boards crosswise laminated with a minimum of three layers. Some panels are produced with gaps between the edges of the boards. For these studies CLT made of European spruce (Picea abies) from 4 manufactures with altogether 13 different build-ups were used. For the used products the maximum width of gaps is limited to 6 mm. In addition, grooves with a width of about 2,5 mm are sawn into the boards of some products. Fig.  \n2 shows cross-sections of different CLT products. Table 1 gives some statistic information about the gaps.  \nFig. 2 Cross-sections of panels without and with gaps between boards and grooves  \nTable 1 Width of gaps between boards of one layer for some different products  \n\n| Manufacture\u003Cbr>r/product | Build-up | Outer layers\u003Cbr>mean\u003Cbr>max.\u003Cbr>95%\u003Cbr>fractile\u003Cbr>Width (in mm) of gaps in\u003Cbr>\u003Cbr>95%\u003Cbr>fractile |  |  |  |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| 1 | 17-17-17-17-17 | 0,6 | 2,1 | 1,6 | 1,6 | 7,3 | 3,4 | 1,0 | 3,0 | 2,3 |\n| 2 | 19-22-19 | 0,4 | 2,0 | 1,3 | - | - | - | 0,5 | 2,2 | 1,8 |\n| 2 | 34-13-34-13-34 | 0,2 | 1,0 | 1,0 | 1,4 | 6,8 | 3,3 | 2,0 | 6,7 | 4,5 |\n| 4 | 9,5-6,8-9,5-6,8-9,5 | 0 | 0 | 0 | 0,6 | 5,4 | 3,5 | 0 | 0 | 0 |\n\nThe characteristic density (at normal cli","cbCaibLyxUmFZIFt","https://ap.wps.com/l/cbCaibLyxUmFZIFt","pdf",402596,15,"English","# Summary\n# 1. Introduction\n# 2. 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