Development of IOS Application on Strengthening of Beams using FRP Composites

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056
Volume: 04 Issue: 06 | June -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1552
Development of IOS Application on Strengthening of Beams using FRP
Composites
Ritesh L1, Mr. Manjunatha L2, Mr. Nisarg Shankar3
1PG Student, Department of Civil Engineering, SJB Institute of Technology, Bengaluru, Karnataka, India
2,3Assistant Professor, Department of Civil Engineering, SJB Institute of Technology, Bengaluru, Karnataka, India
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Abstract - In olden days, the large number of structuresare
constructed using older design codes all over the world and
they are deficient to carry a loads as per newdesigncodes. The
maintenance of such structures is difficult and incurs a huge
amount of public money and time. The rehabilitation and
restoration of a structure is one of the most important things
in civil Engineering field and also a very challengingthingisto
select a strengthening method that will enhance the strength
and serviceability of the structure. Hence the use of FRP
composites is one of the strengthened method adopted in this
work and this can be done by developing IOS application
because as in present days use of application is increasing day
to day and person to person. So keeping in that the
development of IOS application is doneandvalidatedandused
for the case study of residential building in which the beams
were retrofitted for extra live loads.
Key Words: Retrofitting, Carbon Fibre Laminates,
Flexural Strength, IOS Application, RC Beams.
1. INTRODUCTION
The reinforced concrete structure has very much important
in these days. The solidness for this kind of structure has all
the more relatively developed by utilizing other sort of
materials. The upkeep is anything but difficult to sort of the
structures. In a presently days, the rehabilitation and
rebuilding of a structure is a standoutamongstthemostvital
things in structural engineering field and furthermore an
extremely difficult thing is to choose a fortifying technique
that will improve the quality and serviceability of the
structure.
1.1 Retrofitting
There is no single solution that offers a simple,
straightforward method for all repair and strengthening
projects. Further, the process of repair and retrofit of
existing structures are complicated because most of these
structures are occupied, and much of the mainstream
construction community’s expertise is centered on new
construction. However, success can beachievedifrepairand
strengthening systems are tailored to serve a structure’s
intended use without interfering with its occupants or
function. The key to success is a combination of different
design skills and application techniques, structural
strengthening and structural repair necessary for such
projects. As such, the Engineer must rely on his or her
expertise in using mechanical and structural behavior
principles to develop comprehensive retrofit solutions.
1.2 External strengthening by the usage of Fiber
Reinforced Polymers (FRP) composites
As of late the civil designing field has begun to utilizeFRPfor
structural support. This enhances a few extent such high
quality weight proportion, high-firmnessweightproportion,
adaptability in plan, non-destructiveness. For the most part
FRP materials are non-destructive, non-attractive and
impervious to different sorts of chemicals they are
progressively being utilized for outer support of existing
concrete structural. This kind of utilization is normally
alluded to as inside fortification. Also, carbon fiber fortified
polymer (CFRP) strips can be utilized as outer fortification
for expanding the load-conveying limit of ordinary steel and
fortified concrete beams. In this kind of utilization, the CFRP
strips are clung to the outside tensile face of a beam to
supplement its flexural limit.
1.3 Growing importance of software application
in daily life
The world is murmuring to the tune of portable applications
where there is an answer for everything without exception
with cell phones. The mechanical advancement by the
different Mobile App Development Companiesrecommends
that as an ever increasing number of individuals are getting
dependent on versatile applications to satisfy such a variety
of prerequisites while moving. Portable applications have in
fact turned into a guide, a companion and an answer
discoverer for individuals who are so occupied in their
everyday lives. Apple appreciates an imposing business
model and is places high on top of the interest for the
Windows applications. It has likewise expanded throughout
the years in light of the different new elements identified
with social advertising, games and media news, informing
administration and the new forms concentrating on the
speed consider.

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017 www.irjet.net p-ISSN: 2395-0072
1.4 X-code and Swift Programming Language
Xcode is an incorporated improvement condition for macOS
containing a suite of programming advancement
instruments created by Apple for creating programming for
macOS, iOS, watchOS and tvOS. To begin with discharged in
2003, the most recent stable dischargeisrendition2008and
is accessible by means of the Mac App Store for nothing out
of pocket for macOS Sierra users. Swift is a universally
useful, multi-worldview, gathered programming dialect
created by Apple Inc. for iOS, macOS, watchOS, tvOS, and
Linux. Swift is intended to work with Apple's Cocoa and
Cocoa Touch structures and the expansive assortment of
surviving Objective-C(ObjC) codecomposedforAppleitems.
2. ANALYSIS OF STRUCTURE CONSIDERED
To study the flexural behavior of reinforced concrete beams
with and without external strengtheningbyFRPwrapping as
per ACI code and the analysis of residential building using
ETABS for existing moment values of beams and also for the
required live load moments for the strengthening of beams.
To develop the IOS application on design of strengthening of
flexural member the need of XCODE and SWIFT
programming is used and also strengthening of existing
beams for the additional loads using FRP composites by IOS
application.
2.1 Analysis of structure
The modelling of the residential building is done using
ETABS and analyzed for the static dead load, live load and
earthquake loads. The project is residential building
construction and situated at Haraluru Bangalore. Here
moderate exposure conditions are expected and fall inearth
quake zone II. The safe bearing capacity of soil at depth of
1.5 m is taken as 200 kN/m2. The building consists of G+3
floors and this building required to build the swimmingpool
at the terrace floor. The building is analyzed without
swimming pool and with swimming pool load to know the
values of moments. By knowing the moment values the
strengthening of beams is done.
Theoretical analysis and design check of the structural
members of RC framing system is carried out using
structural analysis software ETABS. As per the built
structural framing plans and the dimensions obtained, the
three dimensional analysisoftheexistingstructureiscarried
out using structural analysis software.
Fig 2.1 Beam layout of the plan
Table -2.1: Design codes and standards referred
IS: 875-1987 : Code of
Practice for Design Loads
Part 1-Unit Weight of
Building Materials
Part 2 – Live loads
IS: 456 -2000: Code of Practice for plain and reinforced
Concrete
SP: 16 – 1980 : Design aids for Reinforced Concrete to
IS:456-2000
ACI 440-2r : Guide for the Design and Construction of
Externally Bonded FRP Systems for Strengthening
Concrete Structures
2.2 Load and Load Cases
The dead load in a building shall comprise the weight of all
walls, partitions, floors and roofs and shall include the
weight of all other superimposed loads, which are
permanently attached to the structure.
Self-Weight of slab is considered = 0.15 x 25 = 3.75 kN/m2
(Considering 150mm thick slab)
Finishes = 1.5kN/m2
(Including suspending weights of AC ducts, pipelines, false
ceiling etc)
In live load the following loads are considered,
Load on RCC slab = 2.0 kN/m2
Load on roof slab = 1.0 kN/m2
Live load on terrace floor containing swimming pool is
Height of the pool = 1.22 m

Density of water = 10 kN/m3
Total live load on slab = 1.22x10 = 12.2 kN/m2
In addition to gravity loads there are certain loads that are
almost always applied horizontally, and these must often be
considered in structural design. Such loads are called lateral
loads. Some of the most important kinds of lateral loads are
Wind loads, soil pressure, hydrostatic pressures, forces due
to earthquakes, centrifugal forces, and longitudinal forces.
Fig 2.2 3D model of residential building
The model of with swimming pool and without swimming
pool has been done and the values of bending moments and
shear forces are compared. The model with failure of beams
are taken and strengthened by using developed IOS
application.
Fig 2.3 BMD of without and with swimming pool model
Fig 2.4 SFD of without and with swimming pool model
3. APP DEVELOPMENT
Development of IOS application using XCODE in OSX
software and writing program on strengtheningofbeams by
using FRP composites on SWIFT programming language.
To develop any program the flowchartisveryimportant and
it is step by step procedure to do the programming.
Fig 3.1 Flow chart of developed program
4. DEVELOPMENT OF IOS APPLICATION
The Graphical User Interface is the basic thing required for
any of the application, with the help of the GUI the user can
understand the working of the app. The GUI acts as the blue
print for development of the application and also help-full
for the developer for future up-gradation. The GUI can be
done by knowing the step by step procedure for the design
and that can be achieved by writing the flow-chart and

algorithm for the development,theflow-chartisdescribedin
the previous session and the GUI of the application is shown
in the Fig 4.1
Fig 4.1 GUI of developed screens
4.1 Building of application in X-code
X-code is the IOS application developer tool used in the Mac
system for building of the application and act as a platform
for the design and development of apps. X-code consists of
swift programming language where program is done for the
development of the app.
The steps in developing the application is
1. Creating new project in the X-code
2. Selecting particular story boards like launch screen,
navigation controller and view controller for the particular
gadget.
3. Designing the view controllerscreen byusingtheassistant
tools like outlets, table views, images and buttons etc.
4. Writing program in the coca touch classes for the app and
assigning to the particular view controllers.
4.2 Procedure
A. Initially the screen of the application is designed for the
app and that can be done using view controllersofparticular
size and that screen should be disabled for auto layouts.
Multi screens can be done using multiple view controllers
and these screens can be attached by using the push segue.
B. The design of the view controller is done by using the
assistant tools in the X-code, suppose if we need to input the
data the outlets is used and for the naming text field is used
similarly the image view can be used for the image update.
After inputting the outlets the action can be done and this
can be achieve by using the buttons.
C. After designing the view controller using assistant tools,
the screen should be attached to the swift programming
class called the coca touch class where the programming for
the current screen can bedone.Swift programminglanguage
consists of many data types, functions, variables, arrays,
strings, and conditionals. By using these data types the
programming can be done for the required application.
D. After all the design procedure the app is tested by one of
the tool in the X-code called simulator and this simulator
shows the application same as in the iphone and preview of
the application can be seen.

Fig 4.2 Coca touch class in X-code
5. USE OF DEVELOPED APP FOR STRENGTHENING
OF STRUCTURAL MEMBERS.
The residential building is analyzed with swimming pool
model and without swimming pool model using ETABS. The
bending moment of beams are compared and there is
increase in the value of bending momentsintheterracefloor
of swimming pool model and 5 of them are deficient due to
increase in live load and deficient beams were taken and
strengthened by the developed application.
Fig 5.1 Cross section of beam (B35)
Beam properties:
Breadth (b) = 230 mm
Effective depth (d) = 585 mm
Total depth (D) = 600 mm
Material properties:
Thickness of FRP = 1.02 mm
Ultimate tensile strength = 621 N/mm2
Rupture strain = 0.0015
Modulus of elasticity = 37000 N/mm2
Table 5.1 Beam and material properties
Beams Beam properties Material properties
B2, B3, B17,
B37
b = 230 mm Thickness = 1.02 mm
D = 600 mm Ultimate tensile
strength = 621 N/mm2
Fck = 25 N/mm2 Rupture strain =
0.0015
Fy = 500 N/mm2 Modulus of elasticity =
37000 N/mm2
B35, B40 b = 200 mm Thickness = 1.02 mm
D = 450 mm Ultimate tensile
strength = 621 N/mm2
Fck = 25 N/mm2 Rupture strain =
0.0015
Fy = 500 N/mm2 Modulus of elasticity =
37000 N/mm2
Table 5.2 Design Summary of Strengthened beams by
bonding FRP laminates
5.1 Strengthening of beam B40 by revising cross
section followed by FRP wrapping
From the above tables it is observed that 5 beams in the top
floor of the building were unable to take extra live loads,
hence those beams are strengthened by using developed
application. After strengthening of beams it is observedthat
beam (B40) has a flexural moment 230 kN-m which is less
than required moment 254 kN-m and it is not safe.
The following procedure is used for the beam (B40) to
sustain required moment.
Initially the beam properties of B40 and required moments
were taken out and suitable additional coverconcreteof 150
mm is provided by concrete.
Bea
m
L
m
As
mm
2
Mp
kN-
m
Mr
kN-
m
Af
mm
2
Mn
kN-m
Remar
ks
B2,
B3
6.3 902 12
3
290 470 303 Safe
B17,
B37
6.2 904 10
8
230 470 300 Safe
B35 5.6 864 80 202 408 215 Safe
B40 5.6 943 93 254 408 230 Unsafe

Fig 5.2 Revised cross section of beam (B40)
Beam properties after concrete jacketing
Breadth = 200 mm
Initial depth (d) = 450 mm
Extra depth (d2) = 150 mm
Effective depth (d1) = 545 mm
Total depth (D) = 600 mm
Material properties:
Thickness of FRP = 1.02 mm
Ultimate tensile strength = 621 N/mm2
Rupture strain = 0.0015
Modulus of elasticity = 37000 N/mm2
Area of FRP laminates required for the beam = 408 mm2
The flexural strength of the provided laminates = 332 kN-m
> 93 kN-m
Hence the section is capable of sustaining required bending
moment = 254 kN-m
6. SUMMARY AND CONCLUSIONS
Based on the analysis and interpretation of results carried
out in the work undertaken the following conclusion are
drawn
1. Fibers elasticity plays an important role in
increasing stiffness and this has led to decrease of
deflection.
2. Several beams were found deficient and
strengthened by developed application.
3. Strengthening of beams are done according to ACI
440 -2R code by bonding FRP.
4. To carry out the design calculations for
strengthening of beams, anIOSapplicationhasbeen
developed in swift code.
5. By using FRP as strengthening material the load
carrying capacity of member increases.
6. The results obtained from developed application
are comparable with the example problem given in
ACI 440-2r and are reliable.
7. One of the beam in which the depth is low and
bonding the FRP laminates is alone cannot be
sufficient for strengthening, hence the depth of
beam has been increased and followed by bonding
FRP has been done.
8. With the use of IOS application the time taken for
design calculations for strengthening is reduced.
With the use of IOS application the complexity in
design calculations for strengthening is reduced.
REFERENCES
[1] Habibur Rahman Sobuz, et al “Use of carbon fiber
laminates for strengthening reinforced concrete beams
in bending”, IJCSE (2011) Volume-2, pp 67-84
[2] K.B. Parikh, N.S Patel “Review on analytical study on
strengthening of beam by FRP” IJRET, Volume 5, 2016,
pp 11-14R.
[3] N. Sundar at al “Flexural behavior of RC beams with
hybrid FRP strengthening”, IJCIET (2016), pp 427-433
[4] Sandeep G et al “Strengthening of RCC beam using
different glass fiber”, IJES, V0lume 1, 2013, pp 1-8
[5] T.H. Patel et al “Strengthening of RC beams with FRP
sheets with different configurations in shear and
flexure”, IJETAE, Volume 6, 2016, pp 16-160
[6] Building Code Requirements forStructural Concreteand
Commentary (ACI 318m05)
[7] Guide for the Design and Construction of Externally
Bonded FRP Systems for Strengthening Concrete
Structures (ACI 2r 08)

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