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The document bases the design on full-scale testing results for two truss types (load-and-recovery and load-to-destruction). Load-to-recovery procedures apply dead load, increment live load, record deflection, remove live load, and measure residual set. Load-to-destruction applies load until failure, reporting an average failure load of about 115 psf with failure in 2x4 chord members and no observed glue-line connection failures.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/412-nail-glued-roof-truss-design-and-performance-data-structural-design-data/651163/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/412-nail-glued-roof-truss-design-and-performance-data-structural-design-data/651163.png","ImageObject",300,407,{"name":92,"@type":93},"\tJames","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-24",true,{"@type":102,"interactionType":103,"userInteractionCount":8},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"Why are graphical analysis methods considered unreliable for nail-glued trusses?","Question",{"text":112,"@type":113},"They do not account for combined stresses caused by secondary bending resulting from the extreme rigidity of the nail-glued joint.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How is the load-and-recovery test performed and what is measured?",{"text":117,"@type":113},"An initial dead load is applied, live load is increased in increments while deflection is recorded along the bottom chords, then the live load is removed and residual deflections (residual set) are recorded.",{"name":119,"@type":110,"acceptedAnswer":120},"Where did failure occur in the load-to-destruction test, and were glue-line connection failures observed?",{"text":121,"@type":113},"Failure occurred in the 2x4 chord members at various locations, and no glue-line connection failures were observed.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},651163,1792866419,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":8,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":8,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":129,"read_time":81},2336474466412,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","| 4/12 NAIL-GLUED ROOF TRUSS  \u003Cbr>2'ON CENTER,29-0”TO 34'-8”SPANS   |  |  |  |  |  | DESIGN AND PERFORMANCE DATA  \u003Cbr>STRUCTURAL DESIGN DATA  \u003Cbr>The graphical methods of analysis are unreliable in  \u003Cbr>calculating stres in the nail-glucd truss.They do not  \u003Cbr>consider the combined stresses due to secondary bend  \u003Cbr>ing causod by the extreme rigidity of the nail-glued  \u003Cbr>joint This truss design is based upon full-scale test  \u003Cbr>results Two trsts were performed:foad and recovery;  \u003Cbr>and load-to-destruction.  \u003Cbr>For the load-and-reoovery test,each of three trusss  \u003Cbr>were positiuned in a hydraulic testing facility with the  \u003Cbr>eylinders applying kads at ane-foot intervals along the  \u003Cbr>top chords.  \u003Cbr>An initial load of 10 pounds per square foot,repre-  \u003Cbr>senting the dead load,was applied before beginning de  \u003Cbr>fection readings.Live loads were applind in inerements  \u003Cbr>of 10 pounds per square foot and defiection readings  \u003Cbr>were taken along the bottom chords of the trusses.  \u003Cbr>Aftcr each incrcnent was applicd,the entire live load  \u003Cbr>was Temoved and the residuzl deflections reoorded.  \u003Cbr>After renoval of the design live losd of 30 pounds per  \u003Cbr>sguare foot,the residual deflection averaged 003 inches.  \u003Cbr>The lads were increased until a live loadl of 100 pounds  \u003Cbr>per square foot was reoorded.  \u003Cbr>For the load-to-destruction test,koad was appliod to  \u003Cbr>the truss until failare occurred.An average failure  \u003Cbr>load,for three trusses,was Tecorded at 115 pf.  \u003Cbr>Failure oocurred in the2x4 chord members at vari  \u003Cbr>ous locations.No glue-line connection failures were  \u003Cbr>obscrved.  \u003Cbr>DESICN DATA  \u003Cbr>Span:29-0\"to 34-8\"  \u003Cbr>Slope:4/12  \u003Cbr>tet  \u003Cbr>Dead Load  \u003Cbr>rb  \u003Cbr>Live Load  \u003Cbr>Total  \u003Cbr>peunds  \u003Cbr>ACTUAL TEST DATA  \u003Cbr>(average of 3 trusscs)  \u003Cbr>LIVE LOAD  \u003Cbr>0.42\"  \u003Cbr>Deflection at 30 psf.live koad  \u003Cbr>Average residual set after rdease of  \u003Cbr>30 psl.  \u003Cbr>0.010  \u003Cbr>Average residual set after release of  \u003Cbr>0.18  \u003Cbr>100 psf.  \u003Cbr>115psf  \u003Cbr>TOTALLOAD at Failure  \u003Cbr>DERECNON fincha   |\n| --- | --- | --- | --- | --- | --- | --- |\n| TOP CHORD5-  \u003Cbr>LDNO DIAGONAL一  \u003Cbr>PLAR GUssTS  \u003Cbr>TOP CHOIDS  \u003Cbr>TOP CHORD SPLCE-  \u003Cbr>SHORT DLAO0NAL-  \u003Cbr>BOTTOM CHORDS-  \u003Cbr>8OTOM CHORns  \u003Cbr>HEEL GUs5E75  \u003Cbr>LONO BNAGONAL  \u003Cbr>SHOET DIAGONAL  \u003Cbr>KING POST  \u003Cbr>KING PO5T  \u003Cbr>All GUsseTS BOTH SIDE  \u003Cbr>BOHoM CHOBD SPuCr  \u003Cbr>MIDSPAN OUSSET5  \u003Cbr>4 HEEL Gu55ETS  \u003Cbr>4 TOP CORD 5TAPLES  \u003Cbr>3 PEAK GUS5ET548o11OM CHO02 RJDPAN  \u003Cbr>SPUCE GUSSETS  \u003Cbr>0U5SETS  \u003Cbr>o NAILS  \u003Cbr>SPLICt Gusszrs   |  |  |  |  | 1  \u003Cbr>MEASURE SPAN  \u003Cbr>Detemine the span(out-to-out diuensioe of  \u003Cbr>csnerior wall platex)and abo the amount of  \u003Cbr>overhang desired.  \u003Cbr>WALL PLATE-   |  |\n| 2  \u003Cbr>ORDER MATERIAL  \u003Cbr>33'  \u003Cbr>34'  \u003Cbr>30'  \u003Cbr>31'  \u003Cbr>32'  \u003Cbr>29'  \u003Cbr>SPAN  \u003Cbr>0”  \u003Cbr>4”  \u003Cbr>8”  \u003Cbr>4”  \u003Cbr>8\"  \u003Cbr>8\"  \u003Cbr>0”4”8”  \u003Cbr>0“4”8\"0\"4”  \u003Cbr>8\"  \u003Cbr>0”4”  \u003Cbr>0~  \u003Cbr>Twe2x4x8'-0\"  \u003Cbr>2x4x14'-0\"  \u003Cbr>TWO TOP CHORDSt  \u003Cbr>Twe 2x4x12'-0*  \u003Cbr>Two 2x4x10.0*  \u003Cbr>Two 2×4x10'-0\"  \u003Cbr>BOTTOM CHORD+  \u003Cbr>2x4  \u003Cbr>2x4x14'-0\"  \u003Cbr>2x4x12'-0\"  \u003Cbr>2x4x10-0\"  \u003Cbr>x16/-0  \u003Cbr>TWO 5HORT DIAGONALS  \u003Cbr>Twe 2x4x12'-0~  \u003Cbr>Two 2x4x10'-0\"  \u003Cbr>TWo LONG DIAGONAL5  \u003Cbr>2x4x5'-0\"  \u003Cbr>KING POST  \u003Cbr>%“x4x8'Plywood—structural interior*  \u003Cbr>GUSSETS  \u003Cbr>GLUE  \u003Cbr>21b.Glue (See Block 100  \u003Cbr>FASTENERS  \u003Cbr>2886d ncils or 3841%\"power-driven fasteners  \u003Cbr>1o           \"              “  w    id  u      dn 12 d 1 p rst  \u003Cbr>nred fanicaied n alagi 7mded or Ie     s   |  |  | 3  \u003Cbr>CUT MEMBERS ACCORDING TO THIS SCHEDULE ICut one pattern fruss frst.)  \u003Cbr>32′  \u003Cbr>30′  \u003Cbr>37'  \u003Cbr>29'  \u003Cbr>33'  \u003Cbr>34'  \u003Cbr>SPAN  \u003Cbr>4”  \u003Cbr>4”  \u003Cbr>4”  \u003Cbr>0\"  \u003Cbr>0\"  \u003Cbr>8\"  \u003Cbr>8”  \u003Cbr>4\"  \u003Cbr>4\"  \u003Cbr>4\"  \u003Cbr>8\"  \u003Cbr>0\"  \u003Cbr>8\"  \u003Cbr>8\"  \u003Cbr>0\"  \u003Cbr>0\"  \u003Cbr>8\"  \u003Cbr>0  \u003Cbr>7'-0\"  \u003Cbr>8'-0\"  \u003Cbr>\"A\"  \u003Cbr>TOP CHORD5  \u003Cbr>“B”  \u003Cbr>Cut Only IF Less Overhang Than Thet Lised in Irem \"O\"Is Desired.  \u003Cbr>Twe-10-0”Uneut Lengths  \u003Cbr>\"C\"  \u003Cbr>BOTTOM CHORD ","cbCairoWYJHKWx1J","https://ap.wps.com/l/cbCairoWYJHKWx1J","pdf",1283420,"English","# Design and Performance Data\n## Structural Design Data\n## Actual Test Data\n## Actual Test Procedure (Load-and-Recovery and Load-to-Destruction)\n## Design Data (Span, Slope, Loads)\n## Material and Member Cutting Schedule\n## Construct Jig","[{\"question\":\"Why are graphical analysis methods considered unreliable for nail-glued trusses?\",\"answer\":\"They do not account for combined stresses caused by secondary bending resulting from the extreme rigidity of the nail-glued joint.\"},{\"question\":\"How is the load-and-recovery test performed and what is measured?\",\"answer\":\"An initial dead load is applied, live load is increased in increments while deflection is recorded along the bottom chords, then the live load is removed and residual deflections (residual set) are recorded.\"},{\"question\":\"Where did failure occur in the load-to-destruction test, and were glue-line connection failures observed?\",\"answer\":\"Failure occurred in the 2x4 chord members at various locations, and no glue-line connection failures were observed.\"}]","4/12 NAIL-GLUED ROOF TRUSS - Design and Performance Data - Structural Design Data | PDF"]