IRJET- Analysis of Risk Management in Construction Sector using Fault Tree Analysis and Failure Mode Effects Analysis

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 4274
ANALYSIS OF RISK MANAGEMENT IN CONSTRUCTION SECTOR USING
FAULT TREE ANALYSIS AND FAILURE MODE EFFECTS ANALYSIS
Charan Tej.R1, Dr.A.Krishnamoorthi2
1 P.G student ,Adhiparasakthi Engineering College, Melmaruvathur
2 Professor, Adhiparasakthi Engineering College, Melmaruvathur,TamilNadu,India.
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Abstract - Construction is a risky industry and there is no
other industry that requires proper application of business
practices much as construction industry. Risks have a
significant impact on a construction project’s performance in
terms of cost, time and quality. As the size and complexity of
the projects have increased, an ability to manage risks
throughout the construction process has become a central
element preventing unwanted consequences. The main
objective of this research is to gain understanding of risk
factors that could be for the building projects. By using
combined Failure mode effects analysis (FMEA) i.e. inductive
method and Fault Tree analysis (FTA) i.e. deductive method,
the risks has been analyzed without any shortcomings and
remedial measures being taken. The results of this study
recommended that there is an essential need for more
standardization which addresses issues of clarity, fairness,
roles and responsibilities, allocationofrisks, disputeresolution
and payment. More effort should be made to properly apply
risk management in the construction industry. Based on the
findings, a number of recommendations facilitating more
effective risk management can be developed for the industry
practitioners.
Key Words: Risk, Fault Tree analysis, Failure mode effects
analysis, Cost, Time, Quality, etc
1.INTRODUCTION
Construction industries in the Indian market have to be
competitive and efficient, in order to return to the value to
the project stakeholders. Completingprojectsfasterthan the
normal duration is always challenging task to the
management as it often demands many paradigm shifts. For
too long construction projects have failed to achieve the
time, cost and quality targets that clients and consultants
aim for. Innovative construction techniques and materials
can take time whilst budget constrains reduce overall
quality. Depending upon the uncertainties and the
consequences, therisksareacceptedroutinelyandmeasures
are taken to minimize their consequences. Despite risk
management being a growing element of major projects,
there is no standard to which reference may be made for
techniques, factor and approaches and it was dislack of
information that lead to the research describedinthisstudy.
2. RISK MANAGEMENT
Risk management in a projectencompassestheidentification
of influencing factors which could negatively impact the cost
schedule or quality objectives of the project,quantificationof
the associated impact of the potential risk and
implementation of measures to mitigatethe potentialimpact
of the risk. The riskier the activity is the costlier will be the
consequences in case a wrong decision is made. Proper
evaluation and analysis of risks will help decide justification
of costly measures to reduce the level of risk. It can also help
to decide if sharing the risk with an insurance company is
justified. Some risks such as natural disasters are virtually
unavoidable and effect manypeople. In fact, all choices in life
involve risks. Risks cannot be totally avoidedbutwithproper
management these can be minimized.
3.DETERMINATION OF RISK
There are two methods to determine risks in a project,
namely the qualitative and quantitative approach.The
quantitative analysis relies on statistics to calculate the
probability of occurrence of risk and the impact oftheriskon
the project. The mostcommonwayofemployingquantitative
analysis is to use decision tree analysis, which involves the
application of probabilities to two or more outcomes.
Another method is Monte Carlo simulation, which generates
value from a probability distribution and other factors. The
qualitative approach relies on judgments and it uses criteria
to determine outcome. A common qualitativeapproachisthe
precedence diagramming method, which uses ordinal
numbers to determine priorities and outcomes.Anotherway
of employing qualitative approach is to make a list of the
processes of a project in descending order,calculatetherisks
associated with each process and list the controls that may
exist for each risk. Here we have used reliability based
analysis for the risk determination.
4.FAULT TREE ANALYSIS (FTA)
Fault tree analysis (FTA) is a top down, deductive reasoning
failure analysis in which an undesired state of a system is
analyzed using Boolean logic to combine a series of lower-
level events. This analysis method is mainly used to
understand how systems can fail, to identify the best ways to

reduce risk. The method is employed in other contexts, as
diverse as risk factor identification relating to social service
system failure.
4.1 GATE SYMBOLS
The gates symbol typically works as follows:
 OR gate - the output occurs if any input occurs.
 AND gate - the output occurs only if all inputs occur
(inputs are independent).
 Exclusive OR gate - the output occurs if exactly one
input occurs.
 Priority AND gate - the output occurs if the inputs
occur in a specific sequence specified by a
conditioning event.
 Inhibit gate - the output occurs if the input occurs
under an enabling condition specified by a
conditioning event.
4.2 FTA THROUGH MINIMAL CUT SETS
A minimal cut sets is a smallest combination of component
failures which, if they all occur, will cause the top event to
occur. By the definition, a minimal cut set is thus a
combination of primary events sufficient for the top event.
The combination is a smallest combination in that all the
failures are needed for the top event to occur. If any one of
the failures in the cut sets does not occur, then the top event
will not occur. Any fault tree will consists of finite number of
minimal cut sets, which are unique for the top event. One
component minimal cutsets, if there are any,representthose
single failure which will cause the top event to occur. For an
end component minimal cut sets, all end components in the
cut sets must fail in order for the top event to occur.
The minimal cut set expression for the top event can be
return in the general form,
T=M1+M2+M3+……..Mk
Major risks with delay due to time are shown in figure 1.
Figure 1 represents the risk which involved in time that
causes delay in project completion. The possible reasons
were Wrong material scheduling, Demand of skilled Labor,
Waterline, Increase in cost during execution, Flood, Rework
due to unskilledlabor, Road constructiondelays,Socialwork,
4 way road construction, Unanticipated other works,
Telephone cable laying, Electrification, Internet, Insufficient
data, Demand of skilled Labor, Neighbor issue, Improper
planning,Rain,Unanticipatedpublicconstruction,Insufficient
tools and guides, Unavailability of equipment and software,
Delay in Material Procurement, Remote Area, Insufficient
financial, Congested Area, High cost of skilled labor,
Transportation Issues Strike, Delay in design department,
Insufficient labor, Cascading work delays, Cascading due to
pending delays, Unavailability of skilled labors, Shortage of
Material.
Figure.1 Fault Tree with Top event –Time risk
5.FAILURE MODE AND EFFECT ANALYSIS
FMEA is a bottom-up technique used to identify, prioritize,
and eliminate potential failures from the system, design or
process before they reach the customer. FMEA was
developed as military procedure MIL-P-1629 and published
on 9. November 1949, titled Procedures for Performing a
Failure Mode, Effects and Criticality Analysis. Later in 1960's
it was used in aerospace and rocket industry. In 1974 FMEA
become military standard Mil-Std-1629. In the late 1970’s
Ford Motor Company introduced FMEA to automotive
industry. Now it has been used to find risk possibilities in the
construction industry, as it is large contributor of GDP and
development to our country.
5.1 RISK PRIORITY NUMBER
For calculating the risk in FMEA method, risk has three
components which are multiplied to produce a risk priority
number (RPN):
1. Severity (S): Severity is described on a 10-point scale
where 10 is highest.
2. Occurrence (O): Occurrence is described on a 10-point
scale where 10 is highest.
3. Detection (D): Detection is described on a 10-point scale
where 10 is highest.
RPN= S*O*D.
RPNmin= 1, while RPNmax= 1000.

6.RESULTS AND DISCUSSION
6.1 ANALYSIS OF VARIANCE IN SAMPLES
Analysis of variance (ANOVA) is a collection of statistical
models used to analyzethedifferencesbetweengroupmeans
and their associated procedures (such as "variation" among
and between groups). ANOVA provides a statistical test of
whether or not the means of several groups are equal, and
therefore generalizes the t-test to more than two groups.
Source of
Variati-
on
SS Degr-
ee of
Freed
om
Mean
Square
F
Val
-ue
Calcul-
ated
Values
Between
Rows
9855
5.35
2 49277.
67
4.1 82.134
Between
Columns
3502
27.30
5 70045.
45
3.3
3
116.74
9
Residual/
Error
5999.
66
10 599.96
6
Table -1: Overall Probability values
F < Calculated value
There is a significant difference in the events.
6.2 FAULT TREE ANALYSIS
While considering the calculations of overall
probability, the values obtained for the Poisson and Normal
distributions in Figure.3
Figure.3 Overall Probability values
Figure.3 comprises of the values obtained for the events by
the Poisson and Normal distribution. From the calculation
we have concluded that the probability of occurrence and
the deviation is much more in the undesired event “Time”
when comparing to the other undesired events. So it needs
more attention.
6.3 FAILURE MODE EFFECTS ANALYSIS:
0 500 1000
Wrong material scheduling
Demand of skilled Labour
Waterline
Rework due to unskilled labour
Road construction delays
Delay in design department
Money unavailability
Unexpected cost due to natural…
Interest on cost of own…
Electricity cost fluctuation
Interest on advance
Transportation Issues and Strike
Road construction delays
Shortage of Material
Improper planning
Utility cost fluctuation
Unanticipated other works
Wrong material scheduling
Improper mix design and testing
RPN Value
RPN Value
Figure.2. RPN Values
Figure.2 represents the failure modes and the rankings. The
RPN values were exhibited in the table which shows the
severity of occurrence of the particular events that causes
risk by delay for the project due to various failures.
7.CONCLUSION
In this study, identifying the risk factors faced by
construction industry is based on collecting information
about construction risks, their consequences and corrective
actions that may be done to prevent or mitigate the risk
effects. Risk analysis techniques like fault tree analysis has
stated that undesired event ‘time’ is more risky than other
cost and quality risks. Failure modes effects analysis has
been done to find the risk priority in the failure modes of
possible effects based on undesired event ‘time’. Its causes
has been analysed for risk severity and found that material
shortage and design delays are risk possibilities for risk due
to time.
Risk preventive measures are found to be having a constant
price contract signed with material providers for reducing
cost fluctuations of construction materials. Planning
transportation cost in advance would reduce transportation
problems and hence avoids delay in time. Always
maintaining a pre-set amount of material in stock would
counter issues like strike. Scheduling the construction
activities according to climatic issues will avoid the
unexpected cost due to natural events. Design co-ordination
will cause by both client and contractor will allow to solve
the design issues in construction sector.

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