# WB - Rothoblaas

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WB - Rothoblaas

WB technical data sheets rev00.11/2011 Tensile reinforcement general rules Tensile reinforcement for glued laminated timber Timber-timber connection general rules Reinforcement of notched beams Lateral tensile reinforcement General brochure WB fastening system by SFS intec : DIN 1052 2004-08 Reinforcement of notched beams WB Data sheet No. 04 Convincing advantages: high load-bearing capacity easy installation invisible reinforcement labour saving no gluing required easy design Proposal of design according to DIN 1052: 2004-08 Service class 1, load-duration class short-term; The reinforcements must be calculated for the following tensile force Ft,90,d Ft,90,d = 1.3 · Vd · [ 3 · (1 – α )² – 2 · (1 – α )³ ] he mit α = h he Vd design value of transverse force lad,2 n · Rax,d h lad,1 The distance from the fastener to the bottom edge of the beam must be as small as possible, so that no further lateral tensile proof is necessary. ≤1 kmod = 0.9; GL24h; he = 800 mm 800 n number of fasteners (only one fastener is permitted in the longitudinal direction of the beam) Rax,d design value of the load-bearing capacity of a fastener Values Rax,d can be found in the table below lef = min [ lad,1 ; lad,2 ] 60 60 60 WB -T- 20 48 mm 60 mm a1,c 40 mm 50 mm a2,c 40 mm 50 mm lef = 500 mm => Rax,d = 70.0 kN for WB-T-20 (from table) a1,c Two fasteners are required. a2,c a2 a2,c Please note that in the case of notching only one rod may be allowed in the longitudinal direction of the beam. 128.7 kN 2 · 70.0 kN Load-bearing capacities of the WB threaded rod For ρk = 380 kg/m³ and kmod = 0.9 lef 100 mm 200 mm 300 mm 400 mm 500 mm 600 mm 700 mm 800 mm eyond lef = 644 mm: b Rax,d,max = 72.38 kN WB -T-20 Rax,d 14.0 kN 28.0 kN 42.0 kN 56.0 kN 70.0 kN 84.0 kN 98.0 kN 112.0 kN beyond lef = 808 mm: Rax,d,max = 113.10 kN Intermediate values may be calculated by linear interpolation. The values on a grey background in the table for Rax,d,max are the tensile fracture forces and must not be exceeded! They are independent of gross density, service class and the load-duration class. If you arrive at a higher value than Rax,d,max, you must continue the design with Rax,d = 72.38 kN for d = 16 mm or Rax,d = 113.1 kN for d = 20 mm! The stress proofs (shear force and bending) of the remaining cross-section must be verified independently of the lateral tensile reinforcement. = 0.92 < 1 WB-T-d fastener range Type Other gross densities or modification factors: R'ax,d = Rax,d · kF · kM WB -T-16 Rax,d 11.2 kN 22.4 kN 33.6 kN 44.8 kN 56.0 kN 67.2 kN 180 Ft,90,d = 1.3 · Vd · [ 3 · (1 – a )² – 2 · (1 – a )³ ] = 1.3 · 300 kN · [ 3 · (1 – 0.62)² – 2 · (1 – 0.62)³ ] = 128.7 kN Minimum spacing WB-T-16 1300 50 Arrangement a2 h = 1300 mm; Vd = 300 kN he 800 mm with α = = = 0.62 h 1300 mm Material Diameter T = carbon steel d1 [mm] Length [mm] WB - T - 16 x 3000 WB - T - 20 x 3000 The fasteners are cut precisely to the required length using commercially available tools (such as angle grinders) prior to installation. Amendment factor kF for different gross densities GL ρk in kg/m³ kF 24h 28c 28h 32c 32h 36c 36h 24c 350 380 410 430 450 0.848 1.000 1.164 1.280 1.402 Amendment factor kM for different modification factors kmod kM 0.50 0.55 0.60 0.65 0.70 0.80 0.90 Setting tool WB-T-16 WB-T-20 Drill set DWA-12-ZA-Set DWA-15-ZA-Set 1.10 0.555 0.611 0.667 0.722 0.778 0.889 1.000 1.222 Drill bit 400 mm DWA-12-M7 DWA-15-M9 Insertion sleeve ZE-16-WB ZE-20 -WB All calculations must be verified and signed off by the engineer in charge of the project before the work is performed. SFS intec AG / FasteningSystems / CH-9435 Heerbrugg / [email protected] / www.sfsintec.biz Turn ideas into reality. © SFS intec, iTW, 10/07, 901209, E Technical changes reserverd Printed in Switzerland Ft,90,d Example : DIN 1052 2004-08 WB fastening system by SFS intec Lateral tensile reinforcement WB Data sheet No. 05 WT fasteners Beam hanger Joist hanger Convincing advantages: high load-bearing capacity easy installation invisible reinforcement Suspended purlin labour saving no gluing required easy design Proposal of design Connection geometry Calculation is performed in principle in accordance with DIN 1052: 2004-08 Structural components which are subject to stress due to forces exerted perpendicular to the grain can be reinforced with WT fasteners. This can prevent a reduction in load-bearing capacity of the connection. In the case of lateral tensile stress in the main purlin, the load-bearing capacity of the connection must be reduced. ar hHT hNT a lad,c lad,t lg bHT bNT F90,d a = hHT No proof is necessary for transverse connections where a/hHT > 0.70. 0,70 0.70 > 0.20 0,20 0,5 · hHT 0.5 If ar > 0.5 hHT the connection must be handled as (two) separate transverse connections. lg > 0.5 0,5 · hHT If lg ) 0.5 hHT the fasteners must be handled as one connection. ar bHT hHT bNT hNT a ar lg Proof Transverse connections where a/hHT < 0.20 may only be subject to brief exposure to loads (e.g. wind suction forces). width of the main purlin height of the main purlin width of the secondary purlin height of the secondary purlin distance between the (top) connection and the loaded edge distance between the two outermost connections clear distance between the groups of connections For each group of fasteners it must be veriﬁed that Ft,90,d n · Rax,d 1.0 1,0 Ft,90,d = 1 – 3 · 2 +2· 3 · F90,d lad ,c ad,c ef = min lef lad ,t n number of fasteners (only one fastener is permitted outside the transverse joint in the longitudinal direction of the purlin) Ft,90,d force to be absorbed by the WB fastener F90,d design value of the transverse force being transmitted lef effective thread length Rax,d design value of the load-bearing capacity of a fastener Tables with design values Rax,d and correction factors are printed on the back page. When arranging the WB fasteners, the spacings and distances shown in the drawings must be adhered to. The top of the WB fastener must be * 0.7 hHT from the loaded edge. a 0,7 h lad,t Minimum spacings and Mindestabstände distances lad,c Arrangement a1 a1 nomax. more1 than 1 row of WT B fasteners WB-Reihe pro Seite onausserhalb each side outside the transverse joint des Queranschlusses a2,c a2 a2,c WB -T-16 WB-T-20 a1 64 mm 80 mm a2 48 mm 60 mm a1,c 40 mm 50 mm a2,c 40 mm 50 mm Example Given Connection geometry Service class 2, load-duration class long-term; kmod = 0.7 main purlin secondary purlin GL32c hHT = 1500 mm GL24h bNT / hNT = 200 mm / 600 mm; e = 2000 mm connection joist hanger Vertical connection force F90,d = 55 kN 200 mm / 450 mm produced by steel fabricator Veriﬁcation of the boundary conditions = a = h HT 400 mm 1500 mm = 0,267 0.267 0.70 und > 0.20 0,70 0,20 ar = 200 mm + 2 · 50 mm = 300 mm 750 mm = 0.5 0,5 · h HT lg = 2000 mm – 300 mm = 1700 mm > 750 mm = 0.5 0,5 · h HT Design Resultant tensile force perpendicular to the grain Ft,90,d = 1 – 3 · 0.267 0,2672 + 2 · 0.267 0,2673 · 55 kN = 45,35 45.35 kN Fastener selected: 1 WB-T-20, min. length 1100 mm, so that the distance between the top of the WB fastener and the loaded edge * 0.7 · h: 0.7 · h = 0,7 0.7 · 1500 mm = 1050 mm lmin = 0,7 lef = min 400 mm = 400 mm 700 mm Rax,d = 56 kN · 1,164 0,778 = 50,7 (aus Tabelle, siehe Rückseite) 1.164 · 0.778 50.7 kN (from table overleaf) Proof 45.35 45,35 kN 1 · 50.7 50,7 kN = 0.89 0,89 1.0 1,0 1500 1100 400 400 700 Arrangement 50 100 100 Remarks 55 kN – In the case of a one-sided connection, moment of displacement My = FV · bHT / 2, through which the main beam is subject to torsional stress, must be taken into account in the proof of the main beam. – This also applies to two-sided connections in which the bearing forces VZ of opposing secondary purlins differ by more than 20%. – Detailed instructions for calculating the load-bearing capacity of the WB system are contained in the data sheet entitled «Lateral tensile reinforcement – General principles of design» (WB Data sheet No. 01). – We recommend the WT system (fasteners up to 330 mm long) for smaller dimensions and refer readers to the relevant data sheets. – All calculations must be verified and signed off by the planner in charge of the project before the work is performed. WB fastening system High performance for lateral tensile reinforcement Load-bearing capacities of the WB threaded rod For lk = 380 kg /m³ and kmod = 0.9 Other gross densities or modification factors: R'ax,d = Rax,d · kF · kM WB -T-16 lef WB -T-20 Rax,d WB-T-d fastener range 100 mm 11.2 kN 14.0 kN 200 mm 22.4 kN 28.0 kN 300 mm 33.6 kN 42.0 kN 400 mm 44.8 kN 56.0 kN 500 mm 56.0 kN 70.0 kN 600 mm 67.2 kN 84.0 kN 700 mm beyond lef = 644 mm: Rax,d,max = 72.38 kN 98.0 kN 800 mm Type Rax,d Material Diameter Length T = carbon steel d1 [mm] [mm] WB - T - 16 x 3000 WB - T - 20 x 3000 The fasteners are cut precisely to the required length using commercially available tools (such as angle grinders) prior to installation. Amendment factor kF for different gross densities 112.0 kN GL beyond lef = 808 mm: Rax,d,max = 113.10 kN lk in kg/m³ kF 24c 24h 28c 28h 32c 32h 36c 36h 350 380 410 430 450 0.848 1.000 1.164 1.280 1.402 Intermediate values may be calculated by linear interpolation. The values on a grey background in the table for Rax,d,max are the tensile fracture forces and must not be exceeded! They are independent of gross density, service class and the loadAmendment factor kM for different modification factors duration class. If you arrive at a higher value than Rax,d,max, you must kmod 0.50 0.55 0.60 0.65 0.70 0.80 0.90 1.10 continue the design with Rax,d = 72.38 kN for d = 16 mm 0.555 0.611 0.667 0.722 0.778 0.889 1.000 1.222 k M or Rax,d = 113.1 kN for d = 20 mm! Setting tools Fastener Tools and accessories WB-T-16 WB-T-20 Drill set 2 Bit extensions each 1000 mm 1 Drill bit 400 mm DWA-12-ZA-Set DWA-15-ZA-Set Fastener Tools and accessories WB-T-16 WB-T-20 Insertion sleeve ZE-16-WB ZE-20-WB More information If you have any questions about fastening technology, just call us. We'll be pleased to advise you! WB-T-16 WB-T-20 Drill bit 400 mm DWA-12-M7 DWA-15-M9 Tool holder UNC thread ZA1/2"-11/4"-7UNC Tool holder Morse taper no. 3 ZA1/2"- MK3 SFS intec AG / FasteningSystems / CH-9435 Heerbrugg / [email protected] / www.sfsintec.biz Rothoblaas srl Via dell’Adige 2 /1 IT-39040 Cortaccia BZ Tel +39 0471 81 84 00 Fax +39 0471 81 84 84 [email protected] www.rothoblaas.com Turn ideas into reality. © SFS intec, iTW, 10/07, 901210, E Technical changes reserved Printed in Switzerland Adapters for drivers Simple solution for lateral tensile reinforcements: WB fastening system for economical and secure reinforcements for glulam timber structures Convincing advantages: – easy and reliable calculation – lateral tensile reinforcement without gluing – individually cut to length – high tensile strength of 800 N/mm2 – time saving of up to 50% Foto Fabry – simple principles of calculation facilitate reliable design – forces are transmitted solely through the thread indentations – time-consuming application of adhesives is eliminated! – the high tensile strength of 800 N/mm2 means that up to 50% fewer threaded bars are needed – this results in significant time savings and makes the WB System extremely economical compared to conventional reinforcement methods – the fully countersunk, invisible threaded bars mean that subsequent roof assembly is not obstructed Diverse applications can be implemented with the WB System, such as: Transverse joints Double-pitch roof purlins with arched lower chord Penetrations Arched purlin Double-pitch roof purlin Notching Make large lateral tensile reinforcements faster and more economically with the new WB fastening system! After easy calculation, a borehole corresponding to the core diameter of the threaded bar is drilled in the purlin, and the WB threaded bars are then inserted: 2. Holes up to 3 metres deep can be drilled using the bit extensions of the WB System. 1. Pilot drilling with column type drill. 3. Cut threaded bar to exactly the required length using metal saw or right-angle grinder. 4. Install the threaded bar using a drill with high torque. 5. Countersink WB directly with insertion sleeve. 6. Release insertion sleeve with ratchet. 7. Cover hole with end-grained wooden plug. A strong partner in mechanical fastening with an international presence. Fastening technology you can rely on As a manufacturer of fastening systems SFS intec has set standards for many years based on its long experience of the market and intensive research and development work. Numerous innovations which have proved their qualities millions of times all over the world are tangible evidence of this fact. Manufacturing know-how accumulated over many years in production plants in various European countries and the USA makes SFS intec a highly qualified partner in the field of mechanical fastening technology. Principles of calculation Detailed planning documentation catering for a very wide range of applications ensures easy, reliable calculation. For special applications our structural timberwork consultants will be pleased to assist you in selecting the most efficient and cost-effective fastening method. If you have any questions about fastening technology, just call us. System components Headless threaded rod Insertion sleeve for countersinking Adapter for drivers Drilling system Tensile strength 800 N/mm2 Diameter 16 mm 20 mm Thread geometry DIN 7998 Length 3000 mm individually cut to length easy storage Surface finish zinc electroplated blue passivated, chromium(VI)-free SFS intec AG / FasteningSystems / CH- 9435 Heerbrugg / fs.heerbrugg @ sfsintec.biz / www.sfsintec.biz To make you more competitive. © SFS intec, iTW, 02/07, 900951, E Technical changes reserved Printed in Switzerland Assured quality The high quality standards by SFS intec's products and services are guaranteed by a dynamic quality assurance system and extensive testing in the company's own test laboratories.