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NCCI: Initial sizing of fin plate connections. SN016a-EN-EU
NCCI: Initial sizing of fin plate connections.
This NCCI provides rules for the initial sizing of the components of fin plate connections for a "Simple joint". The rules apply to a bolted connection using non-preloaded bolts (i.e. a Category A: Bearing type bolted connection).
Contents
1. Typical connections 2
2. Choice of fin plate connection 2
3. Choice of bolt type 3
4. Number of bolts in a fin plate connection 3
5. Fin plate dimensions 5
6. Weld size 6
7. Ductility 7
8. Rotation capacity 7
9. Limits of application 7
10. Background 7
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NCCI: Initial sizing of fin plate connections. SN016a-EN-EU
1. Typical connections Fin plates are used for beam/column and beam/beam connections. Typical connections using a single vertical line of bolts are shown in Figure 1.1.
Figure 1.1 Typical Beam/Column & Beam/Beam connections with fin plates
2. Choice of fin plate connection There are two basic types of fin plate connections (see figure 2.1):
1. Fin plate with one vertical line of bolts.
2. Fin plate with two vertical lines of bolts.
It is recommended that:
If adopt fin plate with one vertical line of bolts RdC,Ed 5,0 VV ≤
If adopt a fin plate with two vertical lines of bolts RdC,EdRdC, 5,075,0 VVV >≥
If use an end plate connection. RdC,Ed 75,0 VV >
In the above expressions:
VEd is the design shear force and
VC,Rd is the design shear resistance of the supported beam
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NCCI: Initial sizing of fin plate connections. SN016a-EN-EU
Figure 2.1 Fin plate connections with one and two vertical lines of bolts
3. Choice of bolt type It is recommended to use one grade and one diameter of bolt in a limited range of lengths.
This document and the NCCIs for shear and tying resistance of fin plate connections (SN017 and SN018) relate to Category A bearing type connections (as defined in EN1993-1-8 §3.4.1), using non-preloaded bolts. For this type of connection, the bolt class which is usually used depends on the country of construction: class 10.9 bolts are used in most of Europe, but class 8.8 bolts are used in France and UK.
Usually, bolts should be fully threaded. The commonly used size is:
Bolt diameter = 20 mm
Length = 60 mm.
However, the verification procedures for fin plate connections shown in SN017 and SN018 are valid for bolts from class 4.6 to class 10.9 with different diameter and length.
4. Number of bolts in a fin plate connection The minimum number of bolts (M20, class 8.8 or 10.9) to be adopted is given by:
KVn Ed=
Where:
n is the total number of bolts (i.e 21 nn × )
n1 is number of horizontal rows of bolts
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NCCI: Initial sizing of fin plate connections. SN016a-EN-EU
n2 is number of vertical lines of bolts
(For one vertical line of bolts, n should be rounded up to the nearest whole number, For two vertical lines of bolts, n should be rounded up to the nearest multiple of 2)
VEd is the design shear force in kN
The value of K depends on the type of fin plate connection (i.e. one or two vertical lines of bolts). Tables 4.1 and 4.2 below give the values of K for the two cases.
Table 4.1 Values of K for one vertical line of bolts (i.e. n2 = 1)
K for thickness t (lower of fin plate and supported beam web)
Steel grade (lower of fin plate
and supported beam)
Depth of supported beam
hb1 mm
t = 10 mm t = 8 mm
400≤b1h 30 25
600400 ≤< b1h 50 40 S235
600>b1h 55 45
400≤b1h 40 35
600400 ≤< b1h 60 50 S275
600>b1h 65 55
400≤b1h 45 40
600400 ≤< b1h 70 60 S355
600>b1h 80 65
Table 4.2 Values of K for two vertical lines of bolts (i.e. n2 = 2)
K for thickness t (lower of fin plate and supported beam web)
Steel grade (lower of fin plate
and supported beam)
Depth of supported beam
hb1 mm
t = 10 mm t = 8 mm
400≤b1h 20 20
600400 ≤< b1h 30 30 S235
600>b1h 35 35
400≤b1h 25 25
600400 ≤< b1h 35 35 S275
600>b1h 40 40
400≤b1h 30 30
600400 ≤< b1h 40 40 S355
600>b1h 45 45
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NCCI: Initial sizing of fin plate connections. SN016a-EN-EU
2,b
p
1,b 1
1
1
1
2 2,b
p
1,b 1
1
1
1
2 2
2 2
e
e
h
e
p
p
e e
z
h
e
e
e
e
p
p
e p
z
a a
= 1 = 2n n
gh gh
e h e h
g gv v
b p pb
Figure 4.2 Fin plate parameters
5. Fin plate dimensions a) Depending on the bolt diameter, choose end and edge distances not less than 2d:
i.e. deeee 2and,, b2,b1,21 ≥
b) Height of fin plate
Minimum height of fin plate hp b16,0 h=
Maximum height of fin plate b1d=
Note: Commonly the height of fin plate is rounded up to the nearest 10mm.
c) Vertical bolt spacing: depends on the number of bolts. For M20 bolts p1 should not be less than 70 mm.
d) For M20 bolts, the following dimensions are recommended, depending on the depth of the supported beam.
Table 5.1 Thickness and width of fin plates for one vertical line of bolts (n2 = 1)
Depth of supported beam
hb1 (mm)
Fin plate thickness
tp (mm)
Fin plate width bp (mm)
Horizontal gap gh (mm)
Beam edge distance e2,b (mm)
Fin plate edge distance e2 (mm)
600≤b1h 10 100 10 40 50
600>b1h 10 120 20 40 60
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NCCI: Initial sizing of fin plate connections. SN016a-EN-EU
Table 5.2 Thickness and width of fin plates for two vertical lines of bolts (n2 = 2)
Depth of supported beam
hb1 (mm)
Fin plate thickness
tp (mm)
Fin plate width
bp (mm)
Horizontal gap
gh (mm)
Beam edge distance e2,b (mm)
Transverse bolt pitch p2 (mm)
Fin plate edge
distance e2 (mm)
600≤b1h 10 160 10 40 60 50
600>b1h 10 180 20 40 60 60
where:
d is the bolt diameter
db1 is the distance between fillets of the supported beam
hb1 is the depth of the supported beam
hp is the height of the fin plate
e1,b is the end distance to the edge of the beam or to the edge of the notch
6. Weld size Adopt the following fillet weld sizes, depending on the fin plate steel grade and thickness.
Table 6.1 Size of fillet weld for different fin plate steel grades and thicknesses.
Fin plate Steel grade Dimensions, for fin plate thickness tp
8 mm 10 mm
Throat a (mm)
Leg length s (mm)
Throat a (mm)
Leg length s (mm)
S235 4 6 5 7
S275 4 6 5 7
S355 5 7 5,5 8
s
a
pt
1
2
f,c w,c w,b2t , t , t
Figure 6.2 Fillet weld, throat and leg lengths
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NCCI: Initial sizing of fin plate connections. SN016a-EN-EU
7. Ductility The details given in this NCCI will provide sufficient ductility to meet the requirements of Section 16 of SN017.
8. Rotation capacity The details given in this NCCI will provide sufficient rotation capacity for the connection to be treated as a “simple joint”.
9. Limits of application This NCCI applies to one or two vertical lines of bolts (i.e. n2=1 or n2=2) using non-preloaded bolts for Category A: Bearing type bolted connection in accordance with EN1993-1-8 §3.4.1.
10. Background The rules in this NCCI are based on:
(1) European recommendations for the design of simple joints in steel structures - Document prepared under the supervision of ECCS TC10 by: J.P. Jaspart, S. Renkin and M.L. Guillaume - First draft, September 2003.
(2) Joints in Steel Construction – Simple Connections (P212). The Steel Construction Institute and The British Constructional Association Ltd., 2002.
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NCCI: Initial sizing of fin plate connections. SN016a-EN-EU
Quality Record
RESOURCE TITLE NCCI: Initial sizing of fin plate connections.
Reference(s)
ORIGINAL DOCUMENT
Name Company Date
Created by Edurne Nunez SCI March 2005
Technical content checked by Abdul Malik SCI Aug 2005
Editorial content checked by D C Iles SCI 16/9/05
Technical content endorsed by the following STEEL Partners:
1. UK G W Owens SCI 16/9/05
2. France A Bureau CTICM 16/9/05
3. Germany A Olsson SBI 15/9/05
4. Sweden C Müller RWTH 14/9/05
5. Spain J Chica Labein 16/9/05
Resource approved by Technical Coordinator
G W Owens SCI 26/4/06
TRANSLATED DOCUMENT
This Translation made and checked by
Translated resource approved by:
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