Project 2
Aim
To design pile foundation of a RCC slab bridge having dimensions “15” m span and “5” m height at abutment and width = 12 meters and having vertical capacity as 300 tonnes and horizontal capacity as 40 tonnes per pile. Also, to design the pile cap and its reinforcement.
Size also to be fixed as per design.
M35 concrete and Fe500 steel.
Scour at abutment 4 meters.
Soil density=20 kn/m3 k=0.33 (active)
1000 mm slab can be assumed for 15 m span (For self weight reactions).
Solution
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BASIC DESIGN DATA |
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Span and Cross section |
Unit |
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1 |
C/c of exp joint |
= |
15 |
m |
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2 |
C/c of bearing |
= |
14 |
m |
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3 |
Dist. Of bearing to exp joint |
= |
0.5 |
m |
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4 |
Total Deck width |
= |
12 |
m |
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5 |
Carriage width |
= |
8.5 |
m |
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6 |
Footpath width (One Side) |
= |
1.5 |
m |
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7 |
Width of Crashbarrier |
= |
1 |
m |
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8 |
Width if median |
= |
1 |
m |
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Superstructure Details |
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1 |
No of slab |
= |
1 |
Nos |
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2 |
Cantilever on both sides |
= |
0 |
m |
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3 |
Depth od superstructure |
= |
2.1 |
m |
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4 |
Wearing coat thickness |
= |
0.065 |
m |
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5 |
Bearing thickness |
= |
0.15 |
m |
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6 |
Pedestal thickness |
= |
0.25 |
m |
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7 |
Bearing + pedestal thckness |
= |
0.40 |
m |
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8 |
Type of superstructure |
= |
RCC Slab bridge |
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Level |
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1 |
Height of Substructure |
Assumption |
= |
5 |
m |
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2 |
Finish road Level |
FRL |
= |
100.000 |
m |
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3 |
Bearing Level |
BRL |
= |
97.300 |
m |
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4 |
Abutment Cap Top level |
CTL |
= |
97.235 |
m |
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5 |
Abutment Cap Bottom level |
CBL |
= |
96.235 |
m |
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6 |
Ground Level |
GL |
= |
93.500 |
m |
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7 |
High Flood Level |
HFL |
= |
95.900 |
m |
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8 |
Pile Cap top Level |
= |
88.500 |
m |
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9 |
Pile Cap Bottom level |
= |
86.500 |
m |
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10 |
Pile bottom level |
= |
66.500 |
m |
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11 |
Clear Cover for Pile foundation |
= |
75 |
mm |
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Material Data |
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For Abutment cap, Abutment & Pile |
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Grade of concrete |
fck |
= |
M |
35 |
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Design strength of concrete |
fcd |
15.63 |
Mpa |
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Modulus
of Elasticity of
steel |
Es |
= |
210000 |
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Modulus of Elasticity of concrete |
Ec |
= |
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Mean tensile strength of concrete |
fctm |
= |
2.8 |
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Grade of steel |
fyk |
= |
Fe |
500 |
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Design strength of steel |
Fyd |
434.78 |
Mpa |
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Density of concrete (RCC & PCC) |
Conc_dens |
= |
2.5 |
t/m3 |
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Density of weearing course |
= |
2.2 |
t/m3 |
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Coefficient of Thermal Expansion |
= |
12000000 |
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Shrinkage Strain For Concrete |
= |
20000 |
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Soil Parameters |
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1 |
Angle of shear resistance |
= |
30 |
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2 |
Density of dry backfill |
= |
2 |
t/m3 |
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3 |
Density of submerged backfill |
= |
1 |
t/m4 |
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4 |
K (active) |
= |
0.33 |
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5 |
Type of soil |
= |
median |
soil |
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6 |
Coefficient of friction |
= |
0.5 |
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7 |
Horizontal capacity |
= |
40 |
t |
REFER ATTACHED SHEET FOR DETAILED ANSWER