DESIGN CODES & STANDARDS
Calculations are for street lighting system support poles in Mombasa Port Area Road Development
Project, (MPARD) PK1 and PK2.
The design of structural engineering systems has been carried out in reference to the following
Design codes and standards:
• BS 8110: Parts 1, 2 and 3: Structural use of concrete
• BS 6399: 1996 Loading for Buildings, Part 1 Code of practice for dead and imposed loads
• BS CP3: Chapter V: 1972: Part 2 British Standards Code for Basic data for Buildings.
• BS 5950-1: 2000 – Structural use of steel work in Buildings- Code of Practice for design,
Rolled and welded sections.
• BS 8110: Part 1- Structural use of Concrete- Code of Practice for Design and Construction
• DESIGNERS’ GUIDE TO EN 1993-1-1 EUROCODE 3: DESIGN OF STEEL
STRUCTURE
Design Software
The structural Engineering Design and Analysis has been done by use of STAAD PRO Structural
Analysis. The output annexed in this report. Design R.C Spreadsheets and use of AUTO –CAD
for Structural drawings and detailing.
Dead Loads
Dead loads, also known as permanent or static loads, are those that remain relatively constant over
time and comprise, for example, the weight of a building’s structural elements, such
as beams, walls, roof and structural flooring components.
Table 1.1: Dead loadings
1 Concrete Density ( 24KN/m3)
2 Steel Density ( 7850Kg/m3)
3 Solar and Battery (85Kg)
4 Luminary including the arm (15Kg)
Wind Loads
Structures ( Street Light Pole 12m) will be designed and constructed to resist the effects of wind
loads as determined in CP 3: Chapter V: Part 2: 1972
Table 1.2: Site Characteristics and design Constants
1 Basic Wind Speed 34m/s
2 Factor S1(Topography Factor) 1.0
3 Factor,S2 (Ground roughness/Building size 1.00
and height
4 Factor,S3 (Statistical factor) 1.00
5 Cf, (Force coefficient) 1.00
Dynamic wind Pressure= qs=0.613Vc^2/1000KN/m2
Wind pressure =0.2847 KN/m
BASE PLATE DESIGN
Design data
Specifications from BS 5950: Structural use of steel. Clause 6.2
Diameter of bolt, Adopted db = 16 mm
Diameter of bolt hole, Dh = 16mm+2mm= 18 mm
Edge distance, e1 = 40 mm (2.5db)
End distance, e2 =40 mm (2.5db). Thickness of angle cleat, tp (thickness of the plate) = 20 mm
(output from the design 15.79mm, the thickness of plate adopted for this purpose 20mm.)
Check for bolt spacing and edge/end distances according to BS 5950, Clause 6.2
From the design the proposed plate size 350x350x20mm. The initial design (500x350x20mm)
thick plate was provided for. What is provided for is adequate.
Pitch ≥ 2.5db = 2.5x 16 = 40 < 113 and 333 OK, Pitch ≤ 14tp = 14 x 20 = 280≤ 333 and 113 OK
Edge distance e1 ≥ 1.4Dh = 1.4 x 18 = 30.8 < 40 OK End distance e2 ≥ 1.4Dh = 1.4 x 22 = 30.8 <
40 OK e1 and e2 ≤ 11tp = 11 x 10 x 1 = 110 > 30, 84 OK Bolts edge and end distances are
satisfactory
Job No Sheet No Rev
MOMBASA SOUTHERN BYPASS-STREET LIGHTING
DESIGN REVIEW 1 BS 5950
Part
Software licensed to
Job Title Ref MOMBASA BYPASS
By SM Date22-Mar-22 Chd SM
Client File 12m Pole.std Date/Time 23-Mar-2022 19:50
Job Information
Engineer Checked Approved
Name: SM SM
Date: 22-Mar-22
Structure Type SPACE FRAME
Number of Nodes 5 Highest Node 5
Number of Elements 5 Highest Beam 5
Number of Basic Load Cases 2
Number of Combination Load Cases 2
Included in this printout are data for:
All The Whole Structure
Included in this printout are results for load cases:
Type L/C Name
Primary 1 DEAD LAODS
Primary 2 WIND LOADS
Combination 3 GENERATED BRITISH BS 5950 1
Combination 4 GENERATED BRITISH BS 5950 2
Materials
Mat Name E ν Density α
(N/mm2) (N/mm3) (/°F)
1 STEEL 200E+3 0.300 0.000 6E -6
2 STAINLESSSTEEL 193E+3 0.300 0.000 10E -6
3 ALUMINUM 68.9E+3 0.330 0.000 13E -6
4 CONCRETE 21.7E+3 0.170 0.000 5E -6
1 DEAD LAODS : Node Loads
Node FX FY FZ MX MY MZ
(kN) (kN) (kN) (kN-m) (kN-m) (kN-m)
2 - -0.981 - - - -
1 DEAD LAODS : Selfweight
Direction Factor Assigned Geometry
Y -1.000 ALL
Job No Sheet No Rev
MOMBASA SOUTHERN BYPASS-STREET LIGHTING
DESIGN REVIEW 2 BS 5950
Part
Software licensed to
Job Title Ref MOMBASA BYPASS
By SM Date22-Mar-22 Chd SM
Client File 12m Pole.std Date/Time 23-Mar-2022 19:50
2 WIND LOADS : Beam Loads
Beam Type Direction Fa Da Fb Db Ecc.
(m) (m)
1 UNI kN/m Z 0.285 - - - -
2 UNI kN/m Z 0.285 - - - -
3 UNI kN/m Z 0.285 - - - -
4 UNI kN/m Z 0.285 - - - -
Primary Load Cases
Number Name Type
1 DEAD LAODS Dead
2 WIND LOADS Dead
Node Displacements
Node L/C X Y Z Resultant rX rY rZ
(mm) (mm) (mm) (mm) (rad) (rad) (rad)
1 1:DEAD LAODS 0.000 0.000 0.000 0.000 0.000 0.000 0.000
2:WIND LOADS 0.000 0.000 0.000 0.000 0.000 0.000 0.000
3:GENERATED BRITISH
0.000
BS 59500.000
1 0.000 0.000 0.000 0.000 0.000
4:GENERATED BRITISH
0.000
BS 59500.000
2 0.000 0.000 0.000 0.000 0.000
2 1:DEAD LAODS 0.354 -0.021 0.000 0.354 0.000 0.000 -0.000
2:WIND LOADS 0.000 0.000 43.247 43.247 0.009 -0.001 0.000
3:GENERATED BRITISH
0.495
BS 5950-0.029
1 60.546 60.548 0.012 -0.001 -0.000
4:GENERATED BRITISH
0.424
BS 5950-0.025
2 51.897 51.898 0.010 -0.001 -0.000
3 1:DEAD LAODS 0.354 -0.141 0.000 0.381 0.000 0.000 -0.000
2:WIND LOADS 0.000 0.000 44.196 44.196 0.009 -0.001 0.000
3:GENERATED BRITISH
0.495
BS 5950-0.197
1 61.875 61.877 0.012 -0.001 -0.000
4:GENERATED BRITISH
0.424
BS 5950-0.169
2 53.035 53.037 0.010 -0.001 -0.000
4 1:DEAD LAODS 0.306 -0.021 0.000 0.306 0.000 0.000 -0.000
2:WIND LOADS 0.000 0.000 38.900 38.900 0.009 -0.001 0.000
3:GENERATED BRITISH
0.428
BS 5950-0.029
1 54.460 54.462 0.012 -0.001 -0.000
4:GENERATED BRITISH
0.367
BS 5950-0.025
2 46.680 46.681 0.010 -0.001 -0.000
5 1:DEAD LAODS 0.354 -0.050 0.000 0.357 0.000 0.000 -0.000
2:WIND LOADS 0.000 0.000 43.500 43.500 0.009 -0.001 0.000
3:GENERATED BRITISH
0.495
BS 5950-0.070
1 60.900 60.902 0.012 -0.001 -0.000
4:GENERATED BRITISH
0.424
BS 5950-0.060
2 52.200 52.202 0.010 -0.001 -0.000
Job No Sheet No Rev
MOMBASA SOUTHERN BYPASS-STREET LIGHTING
DESIGN REVIEW 3 BS 5950
Part
Software licensed to
Job Title Ref MOMBASA BYPASS
By SM Date22-Mar-22 Chd SM
Client File 12m Pole.std Date/Time 23-Mar-2022 19:50
Reactions
Horizontal Vertical Horizontal Moment
Node L/C FX FY FZ MX MY MZ
(kN) (kN) (kN) (kN-m) (kN-m) (kN-m)
1 1:DEAD LAODS -0.000 15.170 0.000 0.000 0.000 0.045
2:WIND LOADS 0.000 0.000 -3.416 -20.356 0.142 0.000
3:GENERATED BRITISH
-0.000
BS 5950
21.238
1 -4.783 -28.499 0.199 0.063
4:GENERATED BRITISH
-0.000
BS 5950
18.204
2 -4.100 -24.428 0.171 0.054
Reaction Envelope
Horizontal Vertical Horizontal Moment
Node Env FX FY FZ MX MY MZ
(kN) (kN) (kN) (kN-m) (kN-m) (kN-m)
1 +ve 0.000 21.238 0.000 0.000 0.199 0.063
1 +ve - Load: 3 - - Load: 3 Load: 3
1 -ve -0.000 0.000 -4.783 -28.499 0.000 0.000
1 -ve Load: 3 - Load: 3 Load: 3 - -
Beam Force Detail Summary
Sign convention as diagrams:- positive above line, negative below line except Fx where positive is compression. Distance d is given from
beam end A.
Axial Shear Torsion Bending
Beam L/C d Fx Fy Fz Mx My Mz
(m) (kN) (kN) (kN) (kN-m) (kN-m) (kN-m)
Max Fx 3 3:GENERATED BRITISH
10.500
BS 5950 1
21.238 0.000 4.783 0.199 28.499 -0.063
Min Fx 2 3:GENERATED BRITISH
0.000
BS 5950-0.137
1 -0.062 -0.310 -0.008 0.135 -0.005
Max Fy 1 3:GENERATED BRITISH
0.500
BS 59502.207
1 0.137 0.510 0.135 0.213 -0.063
Min Fy 2 3:GENERATED BRITISH
0.300
BS 5950-0.137
1 -0.093 -0.191 -0.008 0.060 0.018
Max Fz 3 3:GENERATED BRITISH
10.500
BS 5950
21.238
1 0.000 4.783 0.199 28.499 -0.063
Min Fz 2 3:GENERATED BRITISH
0.000
BS 5950-0.137
1 -0.062 -0.310 -0.008 0.135 -0.005
Max Mx 3 3:GENERATED BRITISH
0.000
BS 59502.436
1 0.000 0.598 0.199 0.249 -0.063
Min Mx 2 3:GENERATED BRITISH
0.000
BS 5950-0.137
1 -0.062 -0.310 -0.008 0.135 -0.005
Max My 3 3:GENERATED BRITISH
10.500
BS 5950
21.238
1 0.000 4.783 0.199 28.499 -0.063
Min My 5 3:GENERATED BRITISH
0.583
BS 59500.266
1 0.000 -0.088 0.036 -0.064 -0.001
Max Mz 4 3:GENERATED BRITISH
0.000
BS 59500.000
1 0.074 -0.279 0.000 0.098 0.027
Min Mz 1 3:GENERATED BRITISH
0.500
BS 59502.207
1 0.137 0.510 0.135 0.213 -0.063
Job No Sheet No Rev
MOMBASA SOUTHERN BYPASS-STREET LIGHTING
DESIGN REVIEW 4 BS 5950
Part
Software licensed to
Job Title Ref MOMBASA BYPASS
By SM Date22-Mar-22 Chd SM
Client File 12m Pole.std Date/Time 23-Mar-2022 19:50
Beam Maximum Moments
Distances to maxima are given from beam end A.
Beam Node A Length L/C d Max My d Max Mz
(m) (m) (kN-m) (m) (kN-m)
1 2 0.500 1:DEAD LAODS Max +ve 0.000 0.000 0.000 0.004
Max -ve 0.000 0.000 0.500 -0.045
2:WIND LOADS Max +ve 0.500 0.152 0.000 0.000
Max -ve 0.000 0.000
3:GENERATED BRITISH
Max +veBS 59500.500
1 0.213 0.000 0.005
Max -ve 0.500 -0.063
4:GENERATED BRITISH
Max +veBS 59500.500
2 0.182 0.000 0.004
Max -ve 0.500 -0.054
2 2 0.300 1:DEAD LAODS Max +ve 0.000 0.000 0.300 0.013
Max -ve 0.000 0.000 0.000 -0.004
2:WIND LOADS Max +ve 0.000 0.097 0.000 0.000
Max -ve 0.000 0.000
3:GENERATED BRITISH
Max +veBS 59500.000
1 0.135 0.300 0.018
Max -ve 0.000 -0.005
4:GENERATED BRITISH
Max +veBS 59500.000
2 0.116 0.300 0.015
Max -ve 0.000 -0.004
3 4 10.500 1:DEAD LAODS Max +ve 0.000 0.000
Max -ve 0.000 0.000 10.500 -0.045
2:WIND LOADS Max +ve 10.500 20.356 0.000 0.000
Max -ve 0.000 0.000
3:GENERATED BRITISH
Max +veBS 5950
10.500
1 28.499
Max -ve 10.500 -0.063
4:GENERATED BRITISH
Max +veBS 5950
10.500
2 24.428
Max -ve 10.500 -0.054
4 5 0.700 1:DEAD LAODS Max +ve 0.000 0.000 0.000 0.019
Max -ve 0.000 0.000 0.700 -0.000
2:WIND LOADS Max +ve 0.000 0.070 0.000 0.000
Max -ve 0.700 -0.000 0.000 0.000
3:GENERATED BRITISH
Max +veBS 59500.000
1 0.098 0.000 0.027
Max -ve 0.700 -0.000 0.700 -0.000
4:GENERATED BRITISH
Max +veBS 59500.000
2 0.084 0.000 0.023
Max -ve 0.700 -0.000 0.700 -0.000
5 5 0.583 1:DEAD LAODS Max +ve 0.000 0.000 0.000 0.006
Max -ve 0.000 0.000 0.583 -0.001
2:WIND LOADS Max +ve 0.000 0.000
Max -ve 0.583 -0.046 0.000 0.000
3:GENERATED BRITISH
Max +veBS 5950 1 0.000 0.009
Max -ve 0.583 -0.064 0.583 -0.001
4:GENERATED BRITISH
Max +veBS 5950 2 0.000 0.007
Max -ve 0.583 -0.055 0.583 -0.001
