Scribd
Upload
254 views9 pages

Bridge Design Hardik

This document provides data and load calculations for the design of a bridge superstructure with 3 longitudinal girders. It includes details of the bridge geometry, material properties, and calculations of permanent loads from elements of the superstructure like the deck slab, girders, diaphragms and wearing surface. The total permanent load per girder is determined to be 140.8 tonnes over the 25m span.

Uploaded by

mahak
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
254 views9 pages

Bridge Design Hardik

This document provides data and load calculations for the design of a bridge superstructure with 3 longitudinal girders. It includes details of the bridge geometry, material properties, and calculations of permanent loads from elements of the superstructure like the deck slab, girders, diaphragms and wearing surface. The total permanent load per girder is determined to be 140.8 tonnes over the 25m span.

Uploaded by

mahak
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
You are on page 1/ 9

1.

0 DATA FOR SUPER STRUCTURE


Overall span of girder : 25.000 m
Effective span of the girder : 22.740 m
Width of superstructure : 8.400 m
Width of carrriage way : 7.500 m
c/c of girder : 2.750 m
No. of Longitudinal girder : 3.00 No.
No. of Intermediate Diaphragms : 3.00 No.
Thickness of deck slab : 230.00 mm
Thickness of wearing coat : 75.00 mm
Yield stress of steel : 415.00 N/mm2
Grade of concrete for deck slab Fck : 40.00 N/mm2
Density of steel : 78.50 kN/m3
Density of concrete : 25.00 kN/m3
Density of wearing coat : 25.00 kN/m3
Modulus of elasticity of steel : 2.11 x 105 N/mm2
Modulus of elasticity of concrete : 32500 N/mm2 Ref : IRC 21

2.0 LOADS FOR ANALYSIS AND DESIGN


2.1 Permanent loads and surfacing

2.1.1 Super imposed dead load in T/m, except surfacing


Density WEIGHT IN T
(a) Crash barriers 2.0 x 0.450 (c/s area per m) 2.50 = 2.250
(b) Central verge x (c/s area per m) 2.50 =
(c) Services 1.0 x 0.3 = 0.300
Total 2.550

Hence load per girder will be 2.550 / 3 = 0.850 T/m

2.1.2 Surfacing

(a) Wearing coat 1 x 7.50 x 0.075 x 2.5 = 1.406 T/m


1.406 / 3.0 = 0.469 T/m
2.1.3 Dead load of super structure

[A] SPAN 1 & 2 [PSC GIRDER]

1050 c/s area of girder in m2 Area in m2


150 1.05 x 0.15 = 0.158
150 0.675 x 0.15 = 0.101
375
300 0.3 x 0.94 = 0.282
940
1770

250 150 0.55 x 0.15 = 0.083


0.8 x 0.38 = 0.304
380
1.770 0.927
800
Weight/ m 0.927 x 2.5 = 2.318 T/m
SKETCH SHOWING C/S OF GIRDER AT MID

[B] END WIDENING

1050 c/s area of girder in m2 Area in m2


150 1.05 x 0.15 = 0.158
150 0.925 x 0.15 = 0.139

800 0.8 x 1.47 = 1.176


1.472
1470

Additional area 1.472 - 0.927 = 0.545

Weight per m = 0.545 x 2.5 = 1.363 T/m

Total weight in T = 2 x [ 1.363 x 2.600 (length of widening)


+ 0.5 x 1.500 x 1.36 ]
(Triangular portion)
= 9.129 T
[C] DECK SLAB
Weight of Deck slab = 8.400 x 0.23 x 2.5 = 4.83 T/m

Weight of deck per girder = 4.83 / 3 = 1.61 T/m/girder


[D] DIAPHRAGMS
Three intermediate diaphragm and two end diaphragms are provided
(i) Intermediate diaphragm :

Total length of Diaphragm= 2 x 2750 + 1050 = 6550 mm


Depth of Diaphragm = 1770 - 380 = 1390 mm
Thickness of Diaphragm = 300 mm

Area = 6.55 x 1.39 - 3 x [ 0.927 - 0.304 ]


[Length] [Height] [No. of girders]

= 7.235
Volume = 7.235 x 0.3 = 2.17 m3
Weight = 2.17 x 2.5 = 5.426 T
Weight per girder = 5.426 / 3.00 = 1.809 T

Total weight of = 3.00 x 5.426 = 16.28 T


all diaphragms

(ii) End diaphragm :

Area = 6.55 x 1.39 - 3 x [ 1.472 - 0.304 ]


[Length] [Height] [No. of girders]
= 5.60
Volume = 5.60 x 0.3 = 1.68 m3
Weight = 1.68 x 2.5 = 4.2 T
Weight per girder = 4.2 / 3.00 = 1.4 T

Total weight of = 2.00 x 4.2 = 8.40 T


all diaphragms
[E] RECAPITULATION OF WEIGHT FROM SUPER STRUCTURE SPAN 1

Sr. no. Total


Load in T/m per Total Number
Load from Span in weight per weight per
girder of girder
m girder in T span in T
SIDL except
2.1.1 surfacing 0.85 25.00 21.25 3.00 63.75

2.1.2 Surfacing 0.47 25.00 11.72 3.00 35.16

2.1.3 DEAD LOAD


PSC Girders 2.32 25.00 57.95 3.00 173.86

Diaphragms
Intermediate 5.43 3.00 16.28
End 8.40
diaphragms 4.20 2.00

Deck slab 1.61 25.00 40.25 3.00 120.75

TOTAL IN T 140.80 418.19


1.0 DATA FOR SUPER STRUCTURE
Overall span of girder : 25.000 m
Effective span of the girder : 22.740 m
Width of superstructure : 8.400 m
Width of carrriage way : 7.500 m
c/c of girder : 2.750 m
No. of Longitudinal girder : 3.00 No.
No. of Intermediate Diaphragms : 3.00 No.
Thickness of deck slab : 230.00 mm
Thickness of wearing coat : 75.00 mm
Yield stress of steel : 415.00 N/mm2
Grade of concrete for deck slab Fck : 40.00 N/mm2
Density of steel : 78.50 kN/m3
Density of concrete : 25.00 kN/m3
Density of wearing coat : 25.00 kN/m3
Modulus of elasticity of steel : 2.11 x 105 N/mm2
Modulus of elasticity of concrete : 32500 N/mm2 Ref : IRC 21

2.0 LOADS FOR ANALYSIS AND DESIGN


2.1 Permanent loads and surfacing

2.1.1 Super imposed dead load in T/m, except surfacing


Density WEIGHT IN T
(a) Crash barriers 2.0 x 0.450 (c/s area per m) 2.50 = 2.250
(b) Central verge x (c/s area per m) 2.50 =
(c) Services 1.0 x 0.3 = 0.300
Total 2.550

Hence load per girder will be 2.550 / 3 = 0.850 T/m

2.1.2 Surfacing

(a) Wearing coat 1 x 7.50 x 0.075 x 2.5 = 1.406 T/m


1.406 / 3.0 = 0.469 T/m
2.1.3 Dead load of super structure

[A] SPAN 1 & 2 [PSC GIRDER]

1050 c/s area of girder in m2 Area in m2


150 1.05 x 0.15 = 0.158
150 0.675 x 0.15 = 0.101
375
300 0.3 x 0.94 = 0.282
940
1770

250 150 0.55 x 0.15 = 0.083


0.8 x 0.38 = 0.304
380
1.770 0.927
800
Weight/ m 0.927 x 2.5 = 2.318 T/m
SKETCH SHOWING C/S OF GIRDER AT MID

[B] END WIDENING

1050 c/s area of girder in m2 Area in m2


150 1.05 x 0.15 = 0.158
150 0.925 x 0.15 = 0.139

800 0.8 x 1.47 = 1.176


1.472
1470

Additional area 1.472 - 0.927 = 0.545

Weight per m = 0.545 x 2.5 = 1.363 T/m

Total weight in T = 2 x [ 1.363 x 2.600 (length of widening)


+ 0.5 x 1.500 x 1.36 ]
(Triangular portion)
= 9.129 T
[C] DECK SLAB
Weight of Deck slab = 8.400 x 0.23 x 2.5 = 4.83 T/m

Weight of deck per girder = 4.83 / 3 = 1.61 T/m/girder


[D] DIAPHRAGMS
Three intermediate diaphragm and two end diaphragms are provided
(i) Intermediate diaphragm :

Total length of Diaphragm= 2 x 2750 + 1050 = 6550 mm


Depth of Diaphragm = 1770 - 380 = 1390 mm
Thickness of Diaphragm = 300 mm

Area = 6.55 x 1.39 - 3 x [ 0.927 - 0.304 ]


[Length] [Height] [No. of girders]

= 7.235
Volume = 7.235 x 0.3 = 2.17 m3
Weight = 2.17 x 2.5 = 5.426 T
Weight per girder = 5.426 / 3.00 = 1.809 T

Total weight of = 3.00 x 5.426 = 16.28 T


all diaphragms

(ii) End diaphragm :

Area = 6.55 x 1.39 - 3 x [ 1.472 - 0.304 ]


[Length] [Height] [No. of girders]
= 5.60
Volume = 5.60 x 0.3 = 1.68 m3
Weight = 1.68 x 2.5 = 4.2 T
Weight per girder = 4.2 / 3.00 = 1.4 T

Total weight of = 2.00 x 4.2 = 8.40 T


all diaphragms
[E] RECAPITULATION OF WEIGHT FROM SUPER STRUCTURE SPAN 1

Sr. no. Total


Load in T/m per Total Number
Load from Span in weight per weight per
girder of girder
m girder in T span in T
SIDL except
2.1.1 surfacing 0.85 25.00 21.25 3.00 63.75

2.1.2 Surfacing 0.47 25.00 11.72 3.00 35.16

2.1.3 DEAD LOAD


PSC Girders 2.32 25.00 57.95 3.00 173.86

Diaphragms
Intermediate 5.43 3.00 16.28
End 8.40
diaphragms 4.20 2.00

Deck slab 1.61 25.00 40.25 3.00 120.75

TOTAL IN T 140.80 418.19


2.1.4 Weight of sub structure, and foundation at PIER

You might also like