Principles of design CLT

Transcription

1 Principls of dsign CLT EN : AC: A1:2008 / Principls of dsign CLT 1

2 Editorial This brochur is dsignd to provid an ovrviw of situations frquntly ncountrd in fixing plywood / cross-aminat with dowl-form fastnrs Th guidanc tabl srvs to rapidly and simply indicat th appropriat numbr of fastnrs and spacing for standard connctions with plywood from various producrs using intc fastnrs Product- and manufacturing-spcific provisions should b takn from th rlvant documntation Th quotd support valus and fastnr spacing rcommndations ar intndd as guidlins and in no way rplac sitspcific static calculations; albit worst cas scnarios wr chosn as th basis for dtrmining th rlvant valus Any fastnrs rquird from an ovrall build prspctiv ar not covrd by this data sht; and must b calculatd sparatly Plywood consists of an odd numbr of individual, conifrous timbr shts layrd at right angls to on anothr, with th sction dvlopd symmtrically Europan conifr spcis such as spruc, pin, fir, larch and Douglas fir ar gnrally chosn Th manufactur and us of ply is covrd by th gnral building gulations vral plywood product approvals spcify which fastnrs should b usd, with Eurocod 5 frquntly quotd rgarding th load-baring capacity of th particular fastnrs In practic, load-baring capacitis of various fastnrs ar gnrally takn from Blaß and Uibl (2009), basd on a sris of rcommndations rgarding support and dformation bhaviours of dowl-form fastnrs in plywood laboratd at th Univrsity of Karlsruh in 2007 as part of a comprhnsiv rsarch projct into front fac (oftn rfrrd to as sid facs) and dg connctions (oftn rfrrd to as narrow aras) Dowl-form fastnrs can, indd, b insrtd in both front fac and dg situations, with axial load and shar forcs at work This documnt dos not, thrfor, rprsnt any form of warranty or guarant for applications in plywood In cas of doubt, th plywood manufacturr s guidanc should b sought rgarding th applicability of th valus containd in this documnt Th standards/approvals and litratur usd in this brochur: tandards: Approvals: Tchnical rports: [1] EN : AC: A1:2008; [2] ETA-12/0062; [3] ETA-12/0063; [4] ETA-12/0373 [5] Blaß, HJ; Uibl, T; Bmssungsvorschläg für Vrbindungsmittl in Brttsprrholz; in: Baun mit Holz, 2009, Ban11, Hft 2, Rcommndations for minimum diamtrs of supporting connctions in [5] latral support valu axial support strngth sid fac no valus givn d > 6 mm front fac no valus givn d > 8 mm This datasht also ignors minimum diamtrs It sms highly unlikly that all fastnrs will b in a joint whr numrous fastnrs ar dployd; so rcommndations concrning minimum diamtrs can b avoidd All calculations should b chckd and approvd by a qualifid plannr bfor th work is carrid outit is always th rsponsibility of th usr to adhr to any rlvant, prvailing standards and building rgulations 2 / Principls of dsign CLT

3 Application 1: Butt joint with crossd fastnrs Load baring capacity sclamp h min, CLT astnr L s g s clamp Rk 1) mm mm mm mm kn ,98 2) ,40 2) WT-T-6,5x , , ,46 2) ,28 2) ,82 2) 180 WT-T-8,2x charactristic load baring capacity pr pair 2 only possibl, whn top layr paralll to joint 9,82 Rmarks Charactristic gross dnsity cross laminatd timbr r k = 350 kg/m³ Indicatd load baring capacity is only valid for th fastning gomtry providd Half of ach fastnr must b in ach structural componnt Top layr dirction arbitrary g M = 1,3 (Connctions) All calculations must b vrifid and signd off by th plannr in charg bfor th work is prformd f Rd = g M Rk Minimum distancs d,rd mm mm mm 6, , ,rd h / Principls of dsign CLT 3

4 Application 2: Rabbt joint with rctangular fastnrs Load baring capacity sclamp h min, CLT astnr L s g s clamp Rk * mm mm mm mm kn ,81 90 WT--6,5x , , , , ,99 WT-T-6,5x , , , , , WT-T-8,2x , * charactristic load baring capacity pr fastnr Rmarks Charactristic gross dnsity cross laminatd timbr r k = 350 kg/m³ Indicatd load baring capacity is only valid for th fastning gomtry providd Half of ach fastnr must b in ach structural componnt Top layr dirction arbitrary g M = 1,3 (Connctions) All calculations must b vrifid and signd off by th plannr in charg bfor th work is prformd f Rd = g M Rk Minimum distancs d mm mm mm 6, , h 4 / Principls of dsign CLT

5 Application 3: Rabbt joint with crossd fastnrs Load baring capacity sclamp h min, CLT astnr L s g s calmp Rk,1 * Rk,2 * mm mm mm mm kn kn 100 WT--6,5x ,90 6, , ,09 WT-T-6,5x , , , , , WT-T-8,2x , , ,89 * charactristic load baring capacity pr pair Minimum distancs 9,66 16,77 Rmarks Charactristic gross dnsity cross laminatd timbr r k = 350 kg/m³ Indicatd load baring capacity is only valid for th fastning gomtry providd Half of ach fastnr must b in ach structural componnt Top layr dirction arbitrary g M1 = 1,3 (Connctions) g M2 = 1,1 (Buckling) All calculations must b vrifid and signd off by th plannr in charg bfor th work is prformd f Rd = min g M,1 1 g M,2 Rk, 1 Rk, 2 d,rd mm mm mm mm 6, , ,rd h / Principls of dsign CLT 5

6 Application 4: Cornr joint with rctangular fastnrs Load baring capacity sclamp h min astnr L s g s span Rk * mm mm mm mm kn 70 WT--6,5x , , ,91 WT-T-6,5x , , , , , WT-T-8,2x , , ,09 * Charactristic load baring capacity pr fastnr Rmarks Charactristic gross dnsity cross laminatd timbr r k = 350 kg/m³ Indicatd load baring capacity is only valid for th fastning gomtry providd Valus apply to connctions whr half of ach fastnr is in ach structural componnt Had of WR fastnr flush with surfac of structural componnt Dirction of top-layr in any ordr g M = 1,3 (Connctions) All calculations must b vrifid and signd off by th plannr in charg bfor th work is prformd [kn] h [mm] WR-T-9xL ,98 3,30 3,13 2,95 2,78 2,26 1,81 0, ,98 3,56 3,56 3,39 3,21 2,87 2,69 2, ,98 3,56 3,67 3,67 3,64 3,30 3,13 2, ,98 3,56 3,67 3,67 3,67 3,67 3,56 3,21 f Rd = g M Rk Linar intrpolation may b applid for in-btwn valus Minimum distancs d mm mm mm mm 6, , , h 6 / Principls of dsign CLT

7 Application 5: Cornr joint with crossd fastnrs Load baring capacity sclamp h min astnr L s g s clamp Rk, 1 * Rk,2 * mm mm mm mm kn kn 50 WT--6,5x ,90 6, , ,09 WT-T-6,5x ,86 9, , , , , WT-T-8,2x ,56 16, , ,89 Rk,1 * Rk,1 * Rmarks Charactristic gross dnsity cross laminatd timbr r k = 350 kg/m³ Indicatd load baring capacity is only valid for th fastning gomtry providd Valus apply to connctions whr half of ach fastnr is in ach structural componnt Had of WR fastnr flush with surfac of structural componnt Top layr dirction arbitrary g M1 = 1,3 (Connctions) g M2 = 1,1 (Buckling) All calculations must b vrifid and signd off by th plannr in charg bfor th work is prformd h CLT WR-T-9xL ,56 15,17 17,68 13,08 8,47 3, ,56 15,17 19,78 21,22 16,61 12,01 2, , ,56 15,17 19,78 24,38 24,76 20,15 10,94 1, ,56 15,17 19,78 24,38 28,99 28,30 19,08 9,87 f Rd = min g M,1 1 g M,2 Rk, 1 Rk, 2 Linar intrpolation may b applid for in-btwn valus * charactristic load baring capacity pr pair Minimum distancs,rd 2 d,rd mm mm mm mm mm 6, , , h / Principls of dsign CLT 7

8 Application 6: Cornr joint with shoring timbr and rctangular fastnrs Load baring capacity t 1 / b 2 t 2 / b 1 All calculations must b vrifid and signd off by th plannr in charg bfor th work is prformd Rk,i [kn] astnr L s g s clamp b min,i ti [mm] mm mm mm mm sclamp WT-T-6,5xL , , , , , ,06 WT-T-8,2xL WR-T-6,0xL Minimum distancs Rmarks Charactristic gross dnsity cross laminatd timbr / soft wood r k = 350 kg/m³ Had of WR fastnr flush with surfac of structural componnt Valus apply to connctions whr half of ach fastnr is in ach structural componnt Indicatd load baring capacity is only valid for th fastning gomtry providd Top layr dirction arbitrary g M = 1,3 (Connctions) f Rd = min g M g M Rk, 1 1 Rk, , , , ,65 1, ,78 1,73 1, ,86 1,94 1,83 1, ,86 1,97 1,99 1, ,86 1,97 1, , ,86 1,97 1, ,86 1,97 1, , ,86 1,97 1, ,86 1,97 1,65 1, ,86 1,97 1, ,86 1, ,86 1, ,86 1,97 1, ,86 1,97 d /a 2 mm mm mm mm 6, , , a 2 8 / Principls of dsign CLT

9 Application 7: Cornr joint with push-in brackt Load baring capacity h min astnr L W-T-7x RNä-4,0x50 Rk * mm mm n n kn , , , , W-T-7x 153 2x6 61, , * charactristic load baring capacity pr shar angl RNä: groovd nails Rmarks Charactristic gross dnsity cross laminatd timbr r k = 350 kg/m³ push-in brackt : BP-A: Aluminum T-profil Indicatd load baring capacity is only valid for th fastning gomtry providd Th fastnr had must b insrtd flush with th cross laminatd timbr surfac push-in brackts ar only suitabl for paralll load application Vrtical load transfr to b guaran td via th rsidual contact ara Push-fit brackt spacing to b dtrmind by th load and rquird rsidual wall contact surfac Top layr dirction arbitrary g M = 1,3 (Connctions) Gomtry All calculations must b vrifid and signd off by th plannr in charg bfor th work is prformd f Rd = g M Rk h x BP-A: Aluminium T-profil / Principls of dsign CLT 9

10 Application 8: ingl-sidd fish plat with rctangular fastnrs Load baring capacity OB/3 3-ply panl Krto-Q Plywood h min, CLT astnr L s g Rk * Rk * Rk * Rk * mm mm mm kn kn kn kn ,82 0,77 0,75 0,77 60 WR-4,0x ,91 0,93 0,91 0, , ,95 0,90 0,88 0,91 60 WR-4,5x ,13 1,07 1,05 1, ,14 1,11 1,07 1, ,12 1,08 1,05 1,08 60 WR-5,0x ,30 1,24 1,19 1, ,40 1,37 1,26 1, , ,57 1,52 1,45 1,58 70 WR-6,0x ,75 1,69 1,62 1, ,76 1,74 1,64 1,81 * charactristic load baring capacity pr fastnr 10 / Principls of dsign CLT

11 Rmarks Charactristic gross dnsity cross laminatd timbr r k = 350 kg/m³ Th WR fastnr had must b insrtd flush with th cross laminatd timbr surfac Indicatd load baring capacity is only valid for th fastning gomtry providd OB/3 d = 25 mm according to EN ply panl d = 27 mm according to EN Krto-Q d = 27 mm according to Z Plywood d = 27 mm according to EN Timbr covr dirction EWP arbitrary cross laminatd timbr covr dirction arbitrary Plats must b spcially vrifid if two or mor fastnr rows ar usd g M = 1,3 (Connctions) All calculations must b vrifid and signd off by th plannr in charg bfor th work is prformd f Rd = g M Rk Load baring capacity h CLT OB/3 3-ply panl mm d, EWP a 3, c a 3, c,ewp mm mm mm mm mm mm mm 4, , , , h CLT Krto-Q Plywood mm d a 3, c,ewp, EWP mm mm mm mm mm mm mm 4, , , , ,EWP,EWP h / Principls of dsign CLT 11

12 Application 9: Doubl-sidd fish plat with rctangular fastnrs Load baring capacity OB/3 3-ply panl Krto-Q Plywood h min, CLT astnr L s g Rk * Rk * Rk * Rk * mm mm mm kn kn kn kn ,82 0,78 0,76 0, ,85 WR-4,0x ,89 0, ,82 0, ,91 0,87 0,85 0, ,98 0,94 0,92 WR-4,5x ,94 1,00 0,98 0, ,08 1,04 1,04 1, WR-5,0 x ,15 1,14 1,13 1, ,27 1,24 1,27 1, ,44 1, WR-6,0x , ,49 1,51 1, * charactristic load baring capacity pr fastnr and sid 12 / Principls of dsign CLT

13 Rmarks Charactristic gross dnsity cross laminatd timbr r k = 350 kg/m³ Th WR fastnr had must b insrtd flush with th cross laminatd timbr surfac Indicatd load baring capacity is only valid for th fastning gomtry providd OB/3 d = 18 mm according to EN ply panl d = 20 mm according to EN Krto-Q d = 21 mm according to Z Plywood d = 18 mm according to EN Timbr covr dirction HW arbitrary cross laminatd timbr covr dirction arbitrary Plats must b spcially vrifid if two or mor fastnr rows ar usd g M = 1,3 (Connctions) All calculations must b vrifid and signd off by th plannr in charg bfor th work is prformd f Rd = g M 2 Rk Rk = charactristic load baring capacity pr fastnr and sid Minimum distancs h EWP OB/3 3-ply panl mm d, EWP, EWP mm mm mm mm mm mm mm 4, , , , h EWP Krto-Q Plywood mm d, EWP, EWP mm mm mm mm mm mm mm 4, , , , ,EWP,EWP h / Principls of dsign CLT 13

14 Gnral spacing of fastnrs in CLT cross laminatd timbr astning blow 90 in dg facs (latral) v,o v,o a 2 4 d 2,5 d 6 d 2,5 d a 2 astning blow 90 in sid facs (latral) v,o a 3,t 10 d 12 d 7 d 5 d a 3,t Crossd fastning blow 45 in dg facs (latral) Load in dirction DL,rd v,o a 3,t,, 10 d 12 d 7 d 5 d 5 d 2,5 d, a 3,t Load in dirction QL,rd v,o, a 3,t 14 / Principls of dsign CLT

15 Crossd fastning blow 45 in sid facs (axial) Load in dirction DL a 2,c a 2,c,CG a 2,CG 4 d 2,5 d 5 d 25 d 5 d 4 d a 2,c a 2,rd a 2,CG a 2,CG,CG,CG v,o Load in dirction QL a 2,c,rd a 2,CG a 2,CG v,o a 2,CG a 2,CG Crossd fastning blow 45 in dg facs (axial) a c a rd v,o a c a CG 5 d 4 d 5 d a CG a CG a CG Rmarks a i,rd = max { 1,5 d; (1 - α k /180) ai } mit α k = 90 = cntr of gravity All calculations must b vrifid and signd off by th plannr in charg bfor th work is prformd / Principls of dsign CLT 15

16 Th provn fastning systms for univrsal application in structural timbrwork Olivhällsvägn 10 E trängnäs T +46 (0) sstrangnas@sfsintcbiz ordrs@sfsintcbiz 16 wwwsfsintcbiz/s / Principls of dsign CLT Convincing advantags: n simpl, rliabl calculation n divrs rang of application n durabl joints with high load-baring capacity n fast, fficint installation without pr-drilling n form-fitting joint du to doubl thrad n high asthtic standard du to countrsunk fastnr Prformanc with comprhnsiv bnfits for you n Rductions in tim and cost tructural timbr lmnts ar joind with th spcial fastnrs in a singl opration, without pr-drilling Installation is simpl and scur using th rcommndd tools n Wid rang of application Applications which hav bn impossibl to dat can also b implmntd with ths systms n cur joints crwd joints ar invisibl and thus asthtically plasing Th fastnr is also largly protctd against corrosion and against hat in th vnt of fir n Principls of calculation Dtaild planning documntation catring for a vry wid rang of applications nsurs asy, rliabl calcu lation or spcial applications our structural timbrwork consul tants will b plasd to assist you in slcting th most fficint and cost-ffctiv fastning mthod bruary 2018 ubjct to tchnical modifications and pric changs Printd in wdn CLT-Principl of dsign 2018 Tchnical changs rsrvd Cratd in wdn Th dtails statd ar rsults of tsts and/or calculations and thrfor ar non-binding and do not rprsnt guarantis or warrantd charactristics for not spcifid applications All calculations thrfor hav to b chckd and approvd by th rsponsibl plannr ahad of xcution Th usr is rsponsibl to assur complianc with all applicabl laws and rgulations