Presentation on chenab bridge by Aamir Khan

Seminar
On
CHENAB BRIDGE
BY
Aamir Khan
Under the Guidance of
Er. Mahesh Sharma
Asst. Professor,Dept. of
CIVIL ENGINEERING
School of Engineering And Applied Research

➢ Indian Railways has undertaken the mega-
project of construction of a new railway line
in the State of Jammu and Kashmir.
➢ The Chenab Bridge is a railway steel and
concrete arch bridge under construction
between Bakkal and Kauri in the Reasi from
Udhampur to Baramulla.
INTRODUCTION

➢ Deck height (height above river) - 359 m (1,178 ft.)
➢ Bridge length - 1,315 m (4,314 ft.)
➢ Arch span - 485m (1,532 ft.)
➢ Total number of span – 17
➢ Maximum height of pier - 133.7m
Description of bridge

➢ Travelling in and around the
mountainous region has been a
great difficulty and dangerous
for locals.
➢ For better transportation
facilities Government of India
Constructing a national
railway project that will
connect J&K with the rest of
India.
Need for the Chenab rail bridge

SITE OF BRIDGE
➢ Site is located in mountainous region of Jammu
Kashmir.

Geology
➢ The Chenab Bridge is located in the trickiest section of the
Jammu-Udhampur-Srinagar-Baramulla rail route, where
the typical geology consists of young Himalaya rock.
➢ poor quality, broken rock with dolomitic limestone and
firestone lentils with a silicate content.
➢ Rock class III to V with a strength of 60 to 100MPa and a
volume weight of 2.7t/m³ is encountered
➢ The RMR (rock mass rating) index amounts to 40 to 60.

➢ The planning of this project has been done by WSP group
(Finland) and design of arch is done by sub consultant Leonhardt.
➢ Indian Railway Standards (IRS Standards), IRC, IS have been
used while designing the bridge.
➢ The design speed of the railway was set to be 100 km/h and the
design life had to be 120 years. Fatigue assessment shall be done
as per BS: 5400 Part –10
➢ All conventional railway bridge loads, this bridge has to sustain
special blast loads specified by Indian railway
Design innovation

➢ Wind loads will be derived
using physical topographic
models of the site and tests in
a wind tunnel laboratory
➢ The bridge is designed to resist
wind speeds of up to
260kmph.
➢ The seismic nature of the
project zone was also
considered during its design.

➢ Limit state philosophy of
design has been decided to be
followed as per BS codes.
➢ Provision of long welded rail
(LWR) over the bridges and
resulting force calculation as
per UIC – 774-3R guidelines.
➢ Deformation limits as per
comfort criteria of UIC –
776-2R and UIC 776 -3R
guidelines.

➢ The bridge’s construction principle entails a large bridge
arch with access viaducts at each side.
➢ The large arch is designed as a 2-fold ribbed arch
comprising steel girders with scaffolding braces produced on
the spot.
➢ 5 bridge pillars for the access viaducts are made of steel and
13 of concrete.
➢ The bridge will consist of about 25000 tonnes of steel
structures, the main portion of which will be used for the
arch bridge section
Construction

➢ A cable crane will be built
over the valley for
constructing the steel
structures.
➢ The crane can deliver a
maximum amount of 40
tonnes of steel parts.

FOUNDATION
➢ In order to set up the
foundations for the bridge in
the difficult terrain, Safe
excavation at both sides of
the valley is being prepared
on a grand scale, drilling
for foundation.
➢ The tallest pier is 137.7m tall,
such a tall structure is
required massive foundation
of 150m*36.5m

Slope stabilization
➢ The side slope of the valley
varies from 43 ̊ to 77
➢ The slope stabilization
measure are design by the
Indian institute of science.
➢ After excavation rock bolt of
design length of 4m, 8.5m and
11.5m are installed.

∗ Porus pipes are inserted to prevent the hydrostatic pressure

➢ Guniting with steel reinforcement is provided to strengthen and
stablize the slope.

Challenges in construction
➢ No proper road network in challenging terrain.
➢ The infrastructure of the area are causing additional problems.
➢ Transportation of the construction equipment.
➢ Sensitive region for terrorist attack.

➢ The design of the main arch requires consideration of a
number of additional parameters, such as fatigue, global
stability, second order effects, composite action, etc.
➢ It also requires that such a bridge is designed to achieve a
consistent level of reliability for all load cases, and that the
design standards match the construction standards.
➢ The Chenab Bridge will be the biggest / the longest-span /
the highest railway arch bridge ever built in the world.
Conclusions

Presentation on chenab bridge by Aamir Khan

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Presentation on chenab bridge by Aamir Khan