2/1/2016 Base Plate Design Metric Units Evo Design structural design CALCULATION SHEET P
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2/1/2016
Base Plate Design Metric Units
Evo Design structural design
CALCULATION SHEET
Project Title:
Base plate calculation interactive online spreadsheet
Subject/Feature:
onlinestructuraldesign.com
SAMPLE CALCULATION
Calc. By
MN
Checked By
Date
per EN 1992‐1‐1, EN 1993‐1‐1 and EN 1993‐1‐8
Output
Base plate size in plan Column base forces
Base plate thickness Max. pressure under baseplate
Materials (steel, concrete, bolts)
Profile dimensions
CN
16.04.2014
Max. tension in bolts / bolt verification
Date
0
Rev.
16.04.2014
Input
Column Base Plate Design Online Calculation Report
Column Base Plate Design Online Calculation Report
001‐BASEPLATE Project No.
Calculation No.
HEA340
h =
304.8
mm
profile height
b =
304.8
mm
profile width
H =
600
mm
B =
600
mm Base plate thickness is determined in the calculation 190 s = mm critical section location
 (usually in the middle of the flange)
mm
per EN 1993‐1‐8
Base Plate Dimensions
Bolt locations on plate 241.3
f = nB =
2 number of hold down bolts (bolts in tension) = 20 mm bolt diameter (parameters that can not be modified in the demo version) Materials Steel bolt characteristics 4.6 Bolt class Bold yield strength fyb =
240
Partial factor for steel bolts M2 =
1.25
Section 3 Table 3.1
N/mm2
Section 2 Table 2.1 partial safety factors recommended by the Eurocode;
fyd = fy / M2
Bolt design strength fyd‐b =
192.0
N/mm2
Steel base plate characteristics S 235 Steel grade Steel yield strength fy =
235
N/mm2
References:
1.00
per EN 1993‐1‐8
Numerical values for safety factors may be defined
in the National Annex
for thickness under 40mm
215
M0 =
The National Annex may exclude certain bolt classes.
N/mm2 for thickness between 40mm and 80mm Partial factor for steel elements (in bending) fy =
bolt classes recommended by the Eurocode;
http://www.onlinestructuraldesign.com/preview/Baseplate_metric/Baseplate_metric.htm
Section 6.1 (1) and Note 2B
per EN 1993‐1‐1
value recommended by the Eurocode; value to be used can be found in the Eurocode National Annex
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2/1/2016
Base Plate Design Metric Units
Design of Welded Structures ‐ O. W. Blodgett (James F. Lincoln Arc Welding Foundation) EN 1992‐1‐1:2004 ‐ Eurocode 2: Design of concrete structures ‐ Part 1‐1: General rules and rules for buildings EN 1993‐1‐1:2005 ‐ Eurocode 3: Design of steel structures ‐ Part 1‐1: General rules and rules for buildings
EN 1993‐1‐8:2005 ‐ Eurocode 3: Design of steel structures ‐ Part 1‐8: Design of joints
Evo Design structural design
001‐BASEPLATE
CALCULATION SHEET Project Title:
Steel modulus of elasticity Es =
210000 Concrete characteristics C12/15 Concrete class
per EN 1993‐1‐1
N/mm2
Section 3.2.6 (1)
per EN 1992‐1‐1:2004
Section 3 Table 3.1 per EN 1992‐1‐1:2004 Section 2 Table 2.1N
1 cc * fck / c
Aggregates =
27 GPa for
Ecm =
16.04.2014
values for Persistent & Transient design situations
Coefficient taking account of long term effects
8.00 MPa
on the compressive strength and of unfavourable
recommended by the Eurocode; values to be used may be found in the Eurocode National Annexes
per EN 1992‐1‐1:2004 Section 3.1.6 & Formula 3.15
effects resulting from the way the load is applied value may be found in the EC National Annex
C12/15
per EN 1992‐1‐1:2004 Section 3.1.3 Table 3.1
Section 3.1.3 (2)
Values in Table 3.1 are given for quartzite aggregates
Values for limestone and sandstone are reduced
by 10% and 30% respectively. For basalt aggregates
pair of column base forces. Mx and My are not
18.9 GPa for concrete with sandstone aggregates
CN
concrete class
18900 N/mm2
Ecm =
sandstone
=
Concrete modulus of elasticity
0
Date
Ckd. By
Rev.
16.04.2014
1.5
Ecm =
MN
Design compressive concrete strength fcd =
Date
12 MPa concrete characteristic cylinder strength Partial factor for concrete for ultimate limit states
cc =
Calc. By
fck =
c =
SAMPLE CALCULATION
onlinestructuraldesign.com
Column Base Plate Design Online Calculation Report
Subject
Project No.
Base plate calculation interactive online spreadsheet
Calculation No.
Column base forces
N =
900 kN
M =
200 kN*m
axial force
bending moment 222.2 mm M/F = 100.00 mm eccentricity > H/6 => Baseplate with large eccentricity
the value should be increased by 20%
considered simultaneous. e = H/6 = e References: Design of Welded Structures ‐ O. W. Blodgett (James F. Lincoln Arc Welding Foundation) EN 1992‐1‐1:2004 ‐ Eurocode 2: Design of concrete structures ‐ Part 1‐1: General rules and rules for buildings EN 1993‐1‐1:2005 ‐ Eurocode 3: Design of steel structures ‐ Part 1‐1: General rules and rules for buildings EN 1993‐1‐8:2005 ‐ Eurocode 3: Design of steel structures ‐ Part 1‐8: Design of joints
http://www.onlinestructuraldesign.com/preview/Baseplate_metric/Baseplate_metric.htm
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2/1/2016
Base Plate Design Metric Units
Evo Design structural design
001‐BASEPLATE
CALCULATION SHEET Project Title:
Fb, Y, c Three equations, three unknowns: (Axial force in steel hold down bolts, active area under base plate, aximum pressure under base plate) 1. Forces equilibrium
Calc. By
MN
Ckd. By
Date
Rev.
16.04.2014
SAMPLE CALCULATION
onlinestructuraldesign.com
Column Base Plate Design Online Calculation Report
Subject
Project No.
Base plate calculation interactive online spreadsheet
Calculation No.
0
Date
CN
16.04.2014
Y*c/2 ‐ Fb ‐N = 0
Fb + N = Y*c*B/2
(1)
Fb * f + (Fb + N) * (H/2 ‐ Y/3) ‐ N * e = 0
Fb = ‐N * (H/2 ‐ Y/3 ‐e)/(H/2 ‐ Y/3 + f)
(2a)
(2)
2. Bending moment equilibrium
N = ‐Fb * (H/2 ‐ Y/3 ‐e)/(H/2 ‐ Y/3 + f)
3. Representing the elastic behaviour of the concrete support and the steel hold‐down bolt:
a/b =
b/c =
(b / Es) / (c / Ec)
since
Es =
b / s
modulus of elasticity of steel bolt
Ec =
c / c
modulus of elasticity of concrete
nb =
2
number of steel hold down bolts
Ab =
b =
Fb / Ab
n =
Es / Ec =
(N/Ab)/(c*n) = a/b = From similar triangles a/b = (H/2‐Y+f)/Y
=>
=> From (1), (2) and (3)
2* *2/4 =
N/(Ab*c*n) =
628.3 mm2
area of steel hold down bolts
11.11
modular ratio of elasticity, steel to concrete
N/(Ab*c*n)
(H/2‐Y+f)/Y
c =
Fb * Y / (Ab * n *(H/2 ‐ Y + f))
=>
=>
(3)
Y3 + 3 * (e ‐ H/2) * Y2 + [(6 * n * Ab)/B] * (f + e) * Y ‐Â [(6 * n * Ab)/B] * (H/2 + f) * (f + e) = 0
Y3 + K1 * Y2 + K2 * Y + K3 = 0 where
K1 =
3 * (e ‐ H/2) =
K2 =
[(6 * n * Ab)/B] * (f + e) =
K3 =
‐ K2 * (H/2 + f) =
or
(Fb * Y2 * B) / [2 * Ab * n *(H/2 ‐ Y + f)]
‐Fb * (H/2 ‐ Y/3 ‐e)/(H/2 ‐ Y/3 + b) + Fb =
Solve for Y:
‐233
32360
‐17516444
http://www.onlinestructuraldesign.com/preview/Baseplate_metric/Baseplate_metric.htm
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Base Plate Design Metric Units
310.5 mm Y = References: Design of Welded Structures ‐ O. W. Blodgett (James F. Lincoln Arc Welding Foundation) EN 1992‐1‐1:2004 ‐ Eurocode 2: Design of concrete structures ‐ Part 1‐1: General rules and rules for buildings EN 1993‐1‐1:2005 ‐ Eurocode 3: Design of steel structures ‐ Part 1‐1: General rules and rules for buildings
EN 1993‐1‐8:2005 ‐ Eurocode 3: Design of steel structures ‐ Part 1‐8: Design of joints
Evo Design structural design
001‐BASEPLATE
CALCULATION SHEET Project Title:
Date
per (2a) hold down bolts max. tension (in all bolts)
hold down bolt max. tension ‐ in 1 bolt
52.88 kN (in
2 bolts ) 84.16 N/mm2
redesign base plate length and/or width stress under base plate is larger than the concrete compressive capacity Design of the Base Plate Thickness Critical section location 190 s = mm Stress at the critical section location c *(Y s) / Y =
Design critical moment ‐ at critical section
3.95
OK, bolt effective stress is smaller than bolt design stress
per (3)
8.00 MPa
effective max. pressure under baseplate is compared with the concrete design compressive strength if the max. pressure is higher than the concrete
MPa
87.85 kN*m
(4) per EN 1993‐1‐1 Section 6.2.5 (2) Formula 6.13
82.10 kN*m
(c*Y/2)*(s‐Y/3)*B =
MC,Rd = Mpl,rd = (Wpl * fy)/ M0
Bending plastic design resistance Plastic section modulus of rectangular sections
(5)
2 from (4) and (5) => [fy * (B*tpl )/4]/ M0 > MEd.plate MEd.plate = 87.85 kN*m
MEd.plate =
(tpl = base plate thickness)
16.04.2014
MEd.plate =
B*tpl2/4
CN
[(sc*s/2)*(s/3)+(c*s/2)*(s*2/3)]*B =
192.0 N/mm2
c
0
F1.bolt /(*2/4) =
Ckd. By
16.04.2014
Wpl =
MN
Rev.
26.44 kN
Date
F1.bolt = Fb / 2 =
Calc. By
Fb =
sc =
SAMPLE CALCULATION
onlinestructuraldesign.com
Column Base Plate Design Online Calculation Report
Subject
Project No.
Base plate calculation interactive online spreadsheet
Calculation No.
Design resistance for bending about one principal axis for class 1 or 2 cross sections
=> tpl > sqrt[4 * MEd.plate * M0 / (B * fy)]
=> tpl >
(with fy =
52.19 mm
215 N/mm2)
References: Design of Welded Structures ‐ O. W. Blodgett (James F. Lincoln Arc Welding Foundation) EN 1992‐1‐1:2004 ‐ Eurocode 2: Design of concrete structures ‐ Part 1‐1: General rules and rules for buildings EN 1993‐1‐1:2005 ‐ Eurocode 3: Design of steel structures ‐ Part 1‐1: General rules and rules for buildings http://www.onlinestructuraldesign.com/preview/Baseplate_metric/Baseplate_metric.htm
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2/1/2016
Base Plate Design Metric Units
EN 1993‐1‐8:2005 ‐ Eurocode 3: Design of steel structures ‐ Part 1‐8: Design of joints
http://www.onlinestructuraldesign.com/preview/Baseplate_metric/Baseplate_metric.htm
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