STATIC VALUES
CHARACTERISTIC VALUES EN 1995:2014 SHEAR thin steel-to-timber plate (1)
geometry
TENSION thick steel-to-timber plate (2)
Splate
thread withdrawal(3)
steel tension
Splate
L b d1
b
RV,k
RV,k
Rax,k
Rtens,k
[mm]
[kN]
[kN]
[kN]
[kN]
80
55
100
75
160
130
100
75
120
95
140
110
160
130
180
150
120
90
140
110
160
120
180
140
200
160
5,08 5,36 5,36 6,01 6,87 7,34 7,74 7,74 8,19 8,94 9,32 9,55 9,55
SPLATE = 12,0 mm SPLATE = 10,0 mm
12
95 110
SPLATE = 5,0 mm
10
120 140
SPLATE = 6,0 mm
8
4,07 4,58
SPLATE = 8,0 mm
L [mm]
SPLATE = 4,0 mm
d1 [mm]
5,18
5,56
5,69
7,58
6,19
9,60
6,57
11,11
7,08
13,13
7,84
9,47
8,47
12,00
8,95
13,89
9,58
16,42
10,21
18,94
10,17
13,64
10,92
16,67
11,30
18,18
12,06
21,21
12,82
24,24
20,10
31,40
33,90
NOTES: (1) The shear resistance characteristics are calculated considering the case of
a thin plate (SPLATE ≤ 0,5 d1).
• The tensile design strength of the connector is the lower between the timber-side design strength (Rax,d) and the steel-side design strength (Rtens,d).
(2) The shear resistance characteristics are calculated considering the case of
a thick plate (SPLATE ≥ d1).
Rax,d = min
(3) The axial thread withdrawal resistance was calculated considering a 90° an-
gle between the grain and the connector and for a fixing length of b. In the case of steel-to-timber connections, generally the steel tensile strength is binding with respect to head separation or pull-through.
GENERAL PRINCIPLES: • Characteristic values comply with the EN 1995:2014 standard in accordance with ETA-11/0030. • Design values can be obtained from characteristic values as follows:
Rd =
Rk kmod γM
The coefficients γM and kmod should be taken according to the current regulations used for the calculation.
96 | HBS PLATE | CARPENTRY
Rax,k kmod γM Rtens,k γM2
• For the mechanical resistance values and the geometry of the screws, reference was made to ETA-11/0030. • For the calculation process a timber characteristic density ρk = 385 kg/m3 has been considered. • Values were calculated considering the threaded part as being completely inserted into the wood. • Sizing and verification of the timber elements, panels and steel plates must be done separately. • The characteristic shear resistances are calculated for screws inserted without pre-drilling hole. In the case of screws inserted with pre-drilling hole, greater resistance values can be obtained. • For different calculation methods, the MyProject software is available free of charge (www.rothoblaas.com).