CONSTRUCTION FIXINGS
1) Tension loading Wood attachment part Height Width Wood
KVH; C24 MMS-TC1
kmod & partial safety factor forwood as per DIN 1052:2008/12 Duration of load effect class permanent kmod ym
0.6 1.3
Calculated value Rd in cracked concrete C 20/25 Calculated value Rd on non-cracked concrete C 20/25 Washer diameter
Calculated value of the shear load as per DIN 1052:2008-12 chapter 10.2.4 (1)
Calculated value of the thread pull-out resistance Rax,d 1) Extension of the effective pressure area has already been taken into account
2. Shear loading For bolt and compound anchors, shear loading must be verified
in accordance with the approval as per ETAG 001 Annex C. Here a lever arm of 0.5 x wood thickness + 0.5 x drill hole diameter is to be used, provided that this does not interfere with the construction. Verification of load application in wood must also be examined; in the example given, however, this is not relevant due to the lesser loads. With the MMS-TC, the wood connection
[kN] [kN]
[mm] [kN]
[kN]
MMS-TC 12 x 160
6.7 8.9 n/a
n/a 4.4 Bolt anchor M12
16.7 24
Rax,d = (f1,d *lw
*ds,w n/a
Bolt anchor M12
with washer DIN 125 with washer DIN 440 10.7
-
16.7 44
δc,90d / kc,90 * fc,90 d < = 1 applies 1.05
3.35
) / (sin²α+4/3cos²α) [N] n/a
Table 1: Comparison of calculated loads for single anchors in concrete and wood connections as per DIN 1052:2008-12 with tension loading
is calculated as per Z-21.1-1879, as with steel sheet wood connections, with thick sheeting and a non-load bearing intermediate layer. With regard to load application in concrete, values may be reduced with small edge spacing. The table below shows how an increase in wood thickness influences the calculated load with verification as per ETAG 001. Compared to traditional fasteners, the baseplate anchor MMS-TC can transmit 130% to 360% higher loads.
2) Shear loading Wood attachment part Height Width Wood
MMS-TC2
0.6 1.3
80-160mm 120mm
KVH; C24
kmod & partial safety factor for wood as per DIN 1052:2008/12 Duration of load effect class permanent kmod ym
MMS-TC 12 x 160
Characteristic bending moment M0 Calculated value of the shear capacity VR,d
Rk,c as per ETAG 001
Calculated value of the shear capacity VR,d for an attachment part thickness of (..) in [N]
Calcualted value of the shear capacity Rla,d as per Z-21.1-1879 or DIN 1052:2008-12
Calculated value of the shear capacity Rla,d for an attachment part thickness of (..) in [N]
80 mm 3,100 100 mm 3,100 120 mm 3,100 140 mm 3,100 160 mm 3,100
Planning reliability and material savings For production engineers and construction managers, the
MMS-TC baseplate anchor offers outstanding reliability. Since the product can be used without any further construction processes and tools, many potential sources of error in terms of installation and safety cease to apply. Furthermore, the anchor is designed to take greater tension and shear loads regardless of the thickness of the wood. As such, up to two thirds of the fixation points which would otherwise be required can be saved which, in turn, considerably reduces the amount of material and, in particular, the installation time required. Production and structural
n/a n/a n/a n/a n/a
n/a n/a n/a n/a n/a
Table 2: Comparison of calculated loads for single anchors in concrete and wood connections as per DIN 1052:2008-12 with shear loading
engineers can calculate the MULTI-MONTI Timber Connect both simply and reliably using the HECO calculation software. In addition to anchor certification, certification for wood connections as per DIN 1052:2008-12 is also provided – a verification which is not available with all anchor calculation programs. As a rule, the user is merely informed that the load application and/or load transmission in wood needs to be verified separately. This omission in planning can, however, result in the wood connection being subject to excess loads following installation due to the high characteristic resistance levels in concrete.
www.heco-schrauben.de
100 Fastener + Fixing Magazine • Issue 73 January 2012
80mm n/a 100mm n/a 120mm n/a 140mm n/a 160mm n/a
[Nm] 71 VR,d Bolt anchor M12 = M0 Rkc / γmc / (0.5*tfix
1,363 1,115 944 818 722
Bolt anchor M12
with washer DIN 125 with washer DIN 440 92
85 + 0.5 * d0 ) [N]
1.259 1.030 872 756 667
80-160mm 120mm
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