Scribd
Upload
58 views2 pages

Mini Project 1

The document outlines the design specifications for a reinforced concrete bridge with a clear span of 20m and a total width of 7.32m, intended for two lanes. It includes detailed design data such as material properties, load factors, and preliminary dimensions, following the ERA Bridge Design Manual and AASHTO LRFD guidelines. Key parameters include a girder depth of 1.45m and various load considerations, ensuring structural integrity and compliance with design standards.

Uploaded by

nigusegebregergs275
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
58 views2 pages

Mini Project 1

The document outlines the design specifications for a reinforced concrete bridge with a clear span of 20m and a total width of 7.32m, intended for two lanes. It includes detailed design data such as material properties, load factors, and preliminary dimensions, following the ERA Bridge Design Manual and AASHTO LRFD guidelines. Key parameters include a girder depth of 1.45m and various load considerations, ensuring structural integrity and compliance with design standards.

Uploaded by

nigusegebregergs275
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 2

Mini project

Submission date 17/03/2017 e.c


Design of Reinforced Concrete Bridge
1.0 Design Data
Clear Span (m) length CS – 20m
Skew Angle (Degree) - 0
Number of Girders =3
C/C Support L1=20.6m
Clear Width =7.32m
Number of Lanes =2
Face of railing to End of span =0.4m
Multiple presence Factor=1
Specification Used -ERA Bridge Design Manual 2002/AASHTO LRFD Bridge Design
Spec.1998
Design truck Rear Axle Load = 145 KN
P = 72.5 KN
1.1 Lane Load in the Transverse Direction=9.3kn/m
Design Tandem Axle Load=110kn
Wearing Surface =1.1kn/m2
Highway Railing Load, Ph=44.48kn
1.2 Material Property Used:
Type of Concrete: C-30
f'c= 25.00 Mpa
fc= 10.00 Mpa
Density of Concrete γc= 24.00 KN/m3
Ec =0.043*γc*SQRT (fc')
1.3 Reinforcement:
For bar Diam>=20mm fyk= 400 Mpa
fs= 160 Mpa
For bar Diam<20mm fyk= 276 Mpa
fs= 138 Mpa
Es= 200000 Mpa
Modular Ratio, n=Es/Ec=7.91
Take n=8
1.3 Load and Resistance Factors (LRFD) Design Methodology:
f moment t=φ = 0.9
f shear =φ = 0.9
b= 0.85
Dead Load limit state factor =1.25
Live Load Limit state factor =1.0
Dead Load Service Limit State factor=1.0
Live load service limit state factor =1.3
Fatigue Live Load Factor =0.75
1.4 Dynamic impact allowance
Fatigue abd Fracture 15 %
All other Limit state 33 %
Modulus of rupture=fr=0.63sqrt (fc') = 3.15 MPa
Z in Eq. 9.5 = 30000 KPa
1.5 Preliminary Dimensions

1.6 Typical Cross-Section


Clear Road Way Width =7.3 m
Face of Railing to end slab =0.4m
Total Top Width =8.1m
Span (C/C of Bearings) =S =20.6
Girder Depth=0.07S =1.442 Take D= 1.45 m
C/C of Girder Spacing (a) =2.6m
Overhang Distance (c) =1.45m
Cantilever length =1.26m
Girder web thickness =0.38m
Clear Span between Girders=2.22
Top Slab Thickness (t) =a/12 to a/15 0.2167 m to 0.173 m
Take t= 0.22
Fillets=0.1*0.1 b/n Girders and Deck
Minimum overhang Slab Depth=L/10= 0.145 m
Take t.o.h max = 0.22m
Edge Beam Width = 0.4m
Edge Beam H. = 0.4m
Depth of Diap @ center = 1.2m
Depth of Diap @ end = 1.2m
Total number of Diaphragm = 3.00
C/C distance b/n Diaphragm = 10.30 m

You might also like