Ramset Undercut. Mechanical Anchoring Principal Applications ANCHOR SYSTEMS 26.1 GENERAL INFORMATION

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Kristian Newman
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1 26.1 ANCHOR SYSTEMS 26.1 GENERAL INFORMATION PERFORMANCE RELATED MATERIAL INSTALLATION RELATED Product The Ramset undercut anchor system provides Extreme performance anchoring combined with easy installation and setting. The large undercut bearing area of the expanded anchor transfers the load over a larger area which ensures predictable ductile performance of the anchor. Benefits, Advantages and Features Suitable for structural loads: High tensile capacity Grade 8.8 bolts Full ultimate steel strength developed Resistant to dynamic and cyclic loading Stainless Steel Under Anchors are available upon request Improved security: Torque induced pull down closes gaps and induces preload Large undercut bearing area provides extreme performance in low concrete strength Fast installation: Shouldered 4 cutter Carbide Bit for correct drilling depth L Shouldered 4 Cutter Carbide Bit Undercut Setting Tool d b Undercutting tool with replaceable carbide cutters Anchor setting tool Undercut setting tool Principal Applications Installation Anchoring into cracked & non cracked concrete Tunnel construction o road & rail Securing large overhead loads Bridge refurbishment High tensile loads 1. Drill recommended diameter depth hole with shouldered 4 cutter carbide bit. 2. Remove the debris with hand pump, compressed air, or vacuum. 3. Use the correct size undercut setting tool to set the undercut in the hole. 4. Remove the debris with hand pump, compressed air, or vacuum. 5. Install the undercut anchor in the hole and engage the undercut shield by hammering anchor setting tool until anchor is set. Check that undercut has been set correctly with undercut gauge tool. 6. Install fixture over anchor and tighten nut with a torque wrench to the specified assembly torque RAMSET

2 ANCHOR SYSTEMS Installation and performance details Anchor Size, d b (mm) * Note: For shear loads acting towards an edge or where these optimum dimensions are not achievable, please use the simplified strength limit state design process to verify capacity. Anchor Size, d b (mm) Drilled hole diameter, d h (mm) Edge distance, e c (mm) Maximum fixture thickness, t (mm) Optimum dimensions* Reduced Characteristic Capacity # Anchor spacing, a c (mm) Fixture hole diameter, d f (mm) Concrete substrate thickness, b m (mm) Installation details Anchor effective depth, h (mm) Grade 8.8 Steel Studs Tension, ØN us (kn)*** Shear, ØV us (kn) Depth of drill hole, h 1 (mm) Overall anchor length, L (mm) Concrete Tightening torque, T r (Nm) M M M M Tension, ØN uc (kn)** Concrete compressive strength, f'c 20 MPa 32 MPa 40 MPa M M M M * Note: For shear loads acting towards an edge or where these optimum dimensions are not achievable, please use the simplified strength limit state design process to verify capacity. **Note: Reduced characteristic ultimate concrete tensile capacity = ØN uc where Ø = 0.6 and N uc = Characteristic ultimate concrete tensile capacity. For conversion to Working Load Limit MULTIPLY ØN uc x 0.55 ***Note: Reduced characteristic ultimate steel tensile capacity = ØN us where Ø = 0.8 and N us = Characteristic ultimate steel tensile capacity. For conversion to Working Load Limit MULTIPLY ØN us x 0.56 #Note: Design Tensile Capacity ØN ur = minimum of ØN uc and ØN us 26.2 DESCRIPTION AND PART NUMBERS Anchor Size, d b (mm) Drilled hole diameter, d h (mm) Undercut Anchor Shouldered 4 cutter carbide bit Undercut Hole cutting tool Part Numbers Undercut cutter blade Anchor setting tool Undercut gauge tool M10 20 UCMPM10110HD PH200120SDS UC200SDS BL200 ST200 GE200 M UCMPM12135HD PH225146SDS UC225SDS BL225 ST225 GE225 M UCMPM16190HD PH305205MAX UC305MAX BL305 ST305 GE305 M20 36 UCMPM20240HD PH360258MAX UC360MAX BL360 ST360 GE ENGINEERING PROPERTIES - Carbon Steel Refer to Typical Bolt Performance Information on page 236 of the Specifiers Resource Book Edition RAMSET

3 STEP 1 Select anchor to be evaluated Table 1a Indicative combined loading interaction diagram Design tensile action effect, N* (kn) Notes: ~ Shear limited by bolt and spacer steel capacity. ~ Tension limited by concrete cone capacity. ~ No edge or spacing effects. ~ f' c = 32 MPa M20 M16 M12 M Design shear action effect, V* (kn) Table 1b Absolute minimum edge distance and anchor spacing values, e m and a m (mm) Edge distance, e m Anchor spacing, a m Step 1c Calculate anchor effective depth, h (mm) Refer to Description and Part Numbers table on page Anchor size determined, absolute minimum compliance achieved, effective depth (h) calculated RAMSET

4 STEP 2 Verify concrete tensile capacity - per anchor Table 2a Reduced characteristic ultimate concrete tensile capacity, ØN uc (kn), Ø c = 0.6, f c = 32 MPa Drilled hole dia., d h (mm) Effective depth, h (mm) Table 2b Concrete compressive strength effect, tension, X nc f c (MPa) X nc Table 2c Edge distance effect, tension, X ne Anchor size, d b M10 M12 M16 M20 Effective depth, h (mm) Edge distance, e (mm) Table 2d Anchor spacing effect, end of a row, tension, X nae Note: For single anchor designs, X nae = 1.0 Anchor size, d b M10 M12 M16 M20 Effective depth, h (mm) Anchor spacing, a (mm) RAMSET

5 STEP 3 Table 2e Anchor spacing effect, internal to a row, tension, X nai Note: For single anchor designs, X nai = 1.0 Anchor size, d b M10 M12 M16 M20 Effective depth, h (mm) Anchor spacing a (mm) Design reduced ultimate concrete tensile capacity, ØN urc ØN urc = ØN uc * X nc * X ne * ( X nae or X nai ) Verify anchor tensile capacity - per anchor Table 3a Reduced characteristic ultimate steel tensile capacity, ØN us (kn), Ø n = 0.8 Undercut anchor Grade 8.8 Carbon Steel Step 3b Reduced characteristic ultimate bolt steel tensile capacity, ØN tf (kn) Not appropriate for this product. 3 Design reduced ultimate tensile capacity, ØN ur ØN ur = minimum of ØN urc, ØN us Check N* / ØN ur 1, if not satisfied return to step 1 Tensile performance conversion table Performance Required Concrete Tensile Performance Notation Concrete Tension Capacity NOTE: Design Tensile Capacity is the minimum of Concrete Tension and Steel Tension Capacities Notation Steel Tensile Performance Carbon Steel Tension Capacity Strength Limit State ØN urc MULTIPLY ØN urc x 1.00 ØN us MULTIPLY ØN us x 1.00 Working Load Limit N ac MULTIPLY ØN urc x 0.55 N as MULTIPLY ØN us x 0.56 Cyclic Loading N yc MULITPLY ØN urc x 0.55 N ys MULITPLY ØN us x 0.56 Fire Resistance N Rk,c,fi,t Refer to pages N Rk,s,fi,t Refer to pages Cracked Concrete/Tension Zone N 0 Rd,p MULTIPLY ØN urc x 0.45 N Rd,s MULTIPLY ØN us x 1.00 Seismic N 0 Rd,p,sis Refer to pages N Rd,s,sis Refer to pages RAMSET

6 STEP 4 Verify concrete shear capacity - per anchor Table 4a Reduced characteristic ultimate concrete edge shear capacity, ØV uc (kn), Ø q = 0.6, f c = 32 MPa Edge distance, e (mm) V* Load direction effect, conc. edge shear, X vd Table 4b Concrete compressive strength effect, concrete edge shear, X vc f c (MPa) X vc Table 4c Load direction effect, concrete edge shear, X vd Angle, X vd Table 4d Anchor spacing effect, concrete edge shear, X va Note: For single anchor designs, X va = 1.0 Edge distance, e (mm) Anchor spacing, a (mm) RAMSET

7 e 1 Concrete edges Shear Force e 2 ANCHOR AT A CORNER Failure wedge Table 4e Multiple anchors effect, concrete edge shear, X vn Note: For single anchor designs, X vn = 1.0 Anchor spacing / Edge distance, a / e Number of anchors, n Table 4f Anchor at a corner effect, concrete edge shear, X vs Note: For e 1 /e 2 > 1.25, X vs = 1.0 Edge distance, e 2 (mm) Edge dustance, e 1 (mm) Design reduced ultimate concrete edge shear capacity, ØV urc ØV urc = ØV uc * X vc * X vd * X va * X vn * X vs STEP 5 Verify anchor shear capacity - per anchor Table 5a Reduced characteristic ultimate steel shear capacity, ØV us (kn), Ø v = 0.8 Undercut anchor Grade 8.8 Carbon Steel Step 5b Reduced characteristic ultimate bolt steel shear capacity, ØV sf (kn) Not appropriate for this product RAMSET

8 5 Design reduced ultimate shear capacity, ØV ur ØV ur = minimum of ØV urc, ØV us Check V* / ØV ur 1, if not satisfied return to step 1 Shear performance conversion table Performance Required Concrete Shear Performance Notation Concrete Shear Capacity Steel Shear Performance Notation Carbon Steel Shear Capacity Strength Limit State ØV uc MULTIPLY ØV uc x 1.00 ØV us MULTIPLY ØV us x 1.00 Working Load Limit V ac MULTIPLY ØV uc x 0.55 V as MULTIPLY ØV us x 0.50 Cyclic Loading V yc MULITPLY ØV uc x 0.55 V ys MULITPLY ØV us x 0.50 Fire Resistance V Rk,c,fi,t Refer to pages V Rk,s,fi,t Refer to pages Cracked Concrete/Tension Zone V 0 Rd,c MULTIPLY ØV uc x 0.57 V 0 Rd,s MULTIPLY ØV us x 1.00 Seismic V 0 Rd,c,sis Refer to pages V 0 Rd,s,sis Refer to pages NOTE: Design Shear Capacity is the minimum of Concrete Shear and Steel Shear Capacities STEP 6 6 Combined loading and specification Check N*/ØN ur + V*/ØV ur 1.2, if not satisfied return to step 1 Specify Ramset Undercut Anchor, (Anchor Size) ((Part Number)). Shouldered carbide bit (Part Number) Undercut setting tool (Part Number) Anchor setting tool (Part Number) Undercut gauge g tool (Part Number) Example Anchor, (M20) (UCMPM20240HD). Shouldered carbide bit (PH360258MAX) Undercut setting tool (UC360MAX) Anchor setting tool (ST360) Undercut gauge tool (GE360) Maximum fixed thickness to be 50 mm. To be installed in accordance with Ramset Technical Data Sheet RAMSET

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