NUMERICAL INVESTIGATION OF BRIDGE STRUCTURES SUBJECTED TO GRAVITY, SEISMIC AND MOVING LOADS

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 07 | July 2022 www.irjet.net p-ISSN: 2395-0072
© 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1189
NUMERICAL INVESTIGATION OF BRIDGE STRUCTURES SUBJECTED TO
GRAVITY, SEISMIC AND MOVING LOADS
Alfiya Hakkim1, Muneera B2
1M.Tech student, Dept. of civil Engineering, Younus College of Engineering and Technology, Kerala, India
2Assistant Professor, Dept. of Civil Engineering, Younus College of Engineering and Technology, Kerala, India
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Abstract - : Bridges are very importantinthemodernroads
and railway transportation system, generallyservingassocial
infrastructure system. The main objective of this study is to
match the structuralmembers capabilitybetweenthediffering
types of piers with U- beam girder under gravity, seismic and
vehicle loading. This study investigates efficiency of piers with
U- beam as girder on seismic as well as structuralanalysis and
design of integral bridges by using finite element analysis
software ANSYS 16.0 version. The structure of the bridge will
be design in CAD model software called CREO PARAMETRIC.
The investigation mainly analyzes the structural member
capability between girder shape(U-beam)andpiers(hammer
head pier, multi column bent, solid wall type pier) by applying
different loading conditions.
Key Words: ANSYS, CREO, Seismic load, Bridge, Pier
1. INTRODUCTION
Bridges structures are momentous and proficient civil
structures and they contains on different types of structural
members. These members can be divided into two groups.
The first group is called superstructure and it includes the
bearings, girders (beams), deck (includingsidewalks),joints,
asphalt pavement layer, security barrier, and drainage
system. The second group is known as substructurewhichis
contained on the foundations (piles andpilescap),piers, and
pier caps. In general, bridges are important part of the
transportation engineering system. It presents the
connection way over urban congestion, waterways, and
valleys. The bearing capacity of bridges controls the weight
and the volume of traffic loads which are passed by the
transportation system.
[1] The objective of the study is to compare the structural
members capacity between different types of bridges
structures under seismic load using CSI bridge. Bridges
structures models are box girder bridge, solid girder bridge
model, Precast I girder bridge, Slab bridge, Precast T girder
bridge, U steel girder bridge. The result showed that models
of box girder, precast T, and U steel girder bridge had the
higher values of natural frequency comparing with other
structures
[2] This study deploys simulation of nonlinear analysis of
bridge using DRAIN 2DX. Paper presents details seismic
analysis of RC multicolumn bridge bents and four seismic
rehabilitationschemes.Theseschemesincludedsteel dowels
from the pile cap to the piles, a reinforced grade beam
joining the pile caps and carbon FRP jackets forcolumnsand
joints
[3] The bridging activity is as old as human civilization.
Innumerable bridges of various kinds and of various
materials have been built from times immemorial. Design of
medium span highway bridge system requires careful
selection of structural element in preliminary stage. The
motive behind the study is to prepare some useful interface
for preliminary design of bridge system. There is no unique
form of design which would be always most economical.Itis
only by comparing a few designs that the economic design
can be found in a particular set of conditions. Economy can
be achieved by separately or simultaneouslyconsidering one
or more of the following factors: span, superstructure cross
section, cost of prestressing steel andconcreteconsumption.
The study includesparametricstudyonprestressedconcrete
girder bridge superstructure.
1.1 Objectives
 To determine deformation,stress,ultimateloadand
moment of U- beam girder with piers such as
hammer head, multi column bend and solid wall
type piers under loading conditions (gravity,
seismic and moving loads).
 To validate and check the possibilities of finite
element programming using ANSYS software for
bridge analysis.
1.2 Scope of the Project Work
 Mercalli scale is considered
 Damping the generated vibrationsusingelastomers
 Effect of gravity is considered
 Vehicle loading as per IRC – Class AA tracked
vehicle loading
 Optimization of bridge structures

2. METHODOLOGY
The whole project is divided into sequential steps. The
following chart represents the methodology of the work
Fig -1: Flow chart showing methodology of the study
3. BRIDGE INPUT AND ANALYSIS
3.1 Model
Modelling of 20 m span bridge using CREO PARAMETRIC
CAD modelling software. Specimen and model details were
shown in Table – 1 and Fig – 2 to 4 represents models of
bridge.
Table -1: Specimen and Model Details
Type Superstructure Deck slab
Carriageway width 7.5 m
Kerbs 600 mm on each side
Foot Paths 1.20 m wide on each side
Thickness of wearing coat 80 mm
Lane of bridge Two lane
Span 20 m
Width of deck 11 m
Thickness of deck 300 mm
Concrete M40
Steel Fe415
MODEL NAME MODEL ID
U- beam girder with hammer
head pier under gravity loading
UG – HHP G1
head pier under seismic loading
UG – HHP S1
head pier under vehicle loading
UG – HHP D1
U- beam girder withmulticolumn
bent under gravity loading
UG – MCP G2
bent under seismic loading
UG – MCP S2
bent under vehicle loading
UG – MCP D2
U- beam girder with solid wall
type pier under gravity loading
UG – SWP G3
type pier under seismic loading
UG – SWP S3
type pier under vehicle loading
UG – SWP D3
Fig -2: Model of U- beam girder with hammer head pier
Fig -3: Model of U-beam girder with multi column bent

Fig -4: Model of U-beam girder with solid wall type pier
3.2 Loading
The loads assigned to the bridge are as follows,
Dead Load:
It includes the self-weight of the structure including the
components attached to the structural members such as
crash barrier, etc.
Live Load:
This is entered in the software in form of moving load. For
two numbers of lanes, as per IRC (Indian Road Congress)
class AA type vehicle loading is considered.
Seismic Force:
seismic analysis is being analysed in Mercalli scale.
Magnitude of vibration is being converted to acceleration in
Mercalli scale reading and hence analysis is being done.
Acceleration is taken as 7 m/s2.
4. ANALYSIS
The present study includes two different analysis namely
static structural and transient analysis.
For analysis of bridge, bridge structures such as U- beam
girder with different types of pier suchashammerheadpier,
multi column bent pier, solid wall type pier are examined
under different loading conditions.
Fig -5 represents deformation of U- beam with differentpier
under gravity loading.
Fig -6 represents deformation of U- beam with differentpier
under seismic loading.
Fig -7 represents deformation of U- beam with different
pier under vehicle loading.
Table -2: Results of analysis of U beam girder
MODEL ID DEFORMATION
(mm)
STRESS
(MPa)
FORCE (kN)
UG – HHP G1
0.928 6.176 1.08x10
3
UG – MCP G2 0.925 5.967 2.73x10
3
UG - SWP G3 0.753 4.283 1.05x10
4
UG – HHP S1 1.189 8.605 1.10x10
3
UG – MCP S2 1.193 13.031 2.78x10
3
UG - SWP S3 0.851 9.497 1.08x10
4
UG – HHP D1 0.550 1.898 4.91x10
2
UG – MCP D2 0.524 2.324 6.38x10
3
UG - SWP D3 0.352 0.937 2.58x10
3
Fig -5: Deformation of U-beam girder with different piers
under gravity loading
under seismic loading

under vehicle loading
Table -3: Comparison of results of U beam girder
MODEL ID % INCREASE IN
DEFORMATION
% INCREASE
IN STRESS
UG - SWP G3 0 0
UG – MCP G2 18 28
UG – HHP G1 18 30
UG - SWP S3 0 0
UG – MCP S2 28 27
UG – HHP S1 28 10
UG - SWP D3 0 0
UG – MCP D2 32 60
UG – HHP D1 36 50
5. CONCLUSIONS
 Modelling and analysis of bridge using finite
element program such as ANSYS is possible
 Solid wall type pier with U- beam girder shows less
deformation as compared to multi column bentand
hammer head pier under different loading
 While considering longer spans and elevated
structures solid wall type pier cannot betakenasan
optimized section.Hencemulticolumnbentistaken
6. SCOPE FOR FUTURE WORK
 This study can be continued for different shapes for
girders and pier columnsi.e. rectangular,square etc.
 The column base has been assumed to be fixedatits
bottom in this research. However,thesoil-structure
interaction between piles that support the columns
can be researched.
 All the columns of the bridge considered in this
study have the same height. Bridge having columns
of varying heights may be studied.
 The bridge in this study consists of 20m span
length. The number of spans and their lengths can
be varied in further researches.
REFERENCES
[1] Ali Fadhil Naser (2022), “Comparative Study of seismic
design for different bridges structures”. International
Journal of Engineering Research & Technology, Volume
04, Issue 05.
[2] Gavin et al (2012). “Case study of strategies for seismic
rehabilitationofreinforcedconcrete multicolumnbridge
bents”. Journal of Bridge Engineering page no:139-150.
[3] Sanket Patel and Umang Parekh (2016), “Comparative
study of PSC. Tee girder and PSC box girder”. IJSTE –
International Journal of Science Technology &
Engineering, Volume 2, Issue 11
[4] Sang-Hyo Kim et al (2017), “Vehicle loads for assessing
the required load capacity considering the traffic
environment”. Journal of Appl. Sci. 2017,7, 365;
doi:10.3390/app7040365.
[5] Supriya Madda, Kalyanshetti M.G (2013), “Dynamic
analysis of T-Beam bridge superstructure”International
Journal of Civil and structural Engineering, Vol.3

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