Physical Damages Effect on Residential Houses Caused by the Earthquake at Ranau, Sabah Malaysia

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Physical Damages Effect on Residential Houses Caused by
the Earthquake at Ranau, Sabah Malaysia
Muhamad Azry Khoiry, Noraini Hamzah, Siti Aminah Osman, Azrul A. Mutalib, Shahrizan Baharom &
Roszilah Hamid
Abstract— Earthquake, the destructive natural disaster had
recently stormed East Malaysia. This study aims to identify the
physical effects of the earthquake to the building that occurred
in Sabah, Malaysia. A survey method had been conducted
among 221 citizens in the affected area to meet the
requirements of this research objective. The result shows that
68% responded that building cracks had formed on the wall,
48% cracked floor, 23% cracked columns, 10% damages on
roof and 8% responded no damages at all while only 2% stated
the total collapse of the houses’ structures. Researchers have
also identified that the impact of the earthquake towards their
house yards shows that 55% and 12% responded experienced
cracks on ground and landslide respectively, 25% with flood
occurrence and 1% are caught with fire. Finally, almost 90%
of the respondents are ready to upgrade their house structures.
Thus, this research will be continued by developing the
retrofitting and strengthening methods for the low rise
buildings.
Index Terms—physical damage, earthquake, residential house,
questionnaire
I. INTRODUCTION
The discharge of energy in the earth crust will create
seismic waves that we called it as earthquakes. The process
of energy forms during earthquakes can be explained by the
elastic rebound theory. It can be explained that as the rocks
on adverse sides of fault are deal with force and move, it
slowly deform and acquire stress energy until the maximum
capacity of stored energy of the crust exceeded. As a result,
there will be a sudden movement of crust along the fault,
discharge its stored energy and back to their original un-
deformed shape.
Manuscript received December 5, 2017.
Muhamad Azry bin Khoiry is a senior lecturer at Department of Civil
and Structural Engineering, Universiti Kebangsaan Malaysia, 43600 UKM
Bangi, Bangi, Selangor, Malaysia (e-mail: azrykhoiry@ukm.edu.my).
Noraini Hamzah is a senior lecturer at Department of Civil and
Structural Engineering, Universiti Kebangsaan Malaysia, 43600 UKM
Bangi, Selangor, Malaysia (e-mail: ainhamzah@ukm.edu.my).
A. A. Mutalib is a senior lecturer at Department of Civil and Structural
Engineering, Universiti Kebangsaan Malaysia, 43600 UKM Bangi,
Selangor, Malaysia (e-mail: azrulaam@ukm.edu.my).
Siti Aminah Osman is an Associate Professor at Department of Civil
and Structural Engineering, Universiti Kebangsaan Malaysia, 43600 UKM
Bangi, Selangor, Malaysia (e-mail: saminah@ukm.edu.my).
Shahrizan Baharom is a senior lecturer at Department of Civil and
Structural Engineering, Universiti Kebangsaan Malaysia, 43600 UKM
Bangi, Selangor, Malaysia (e-mail: azrulaam@ukm.edu.my).
Roszilah Hamid is an Associate Professor at Department of Civil and
Structural Engineering, Universiti Kebangsaan Malaysia, 43600 UKM
Bangi, Selangor, Malaysia (e-mail: roszilah@ukm.edu.my).
There are mainly three main types of faults, which are
normal fault, thrust fault and strike-slip fault. Normal fault
is because of the tension forces between the crust and which
like they moving away from each other. Thrust fault is
because of the compression forces and acting like they
pushing each other crust. Next is strike-slip fault is because
of the shearing forces between the earth crust.
Liquefaction is another impact from the earthquakes,
which lead to the damaged building. It is the behaviour of
the soil that loose its strength due to some factors like sand
boils, flow failures, ground oscillation and lateral spreads.
But for our case study we are focusing on lateral spread
because it is liquefaction due to the earthquakes event.
Lateral spreads in the involvement of lateral displacement
of large, shallow block of soil as a result of liquefaction in a
subsurface layer [1]. The combination of gravitational and
inertial forces from the earthquakes generates ground
movements. Lateral spreads also commonly disturb
foundations of buildings because its’ location is above or
across the failure.
When the ground is shaking violently, medium to low
rise buildings, which are not earthquake proof, have more
danger of collapsing because they are not flexible. For tall
buildings, the ground’s rapid motion is dispersed to the
reinforcement structure of the buildings. But for low rise
buildings, the structure is not designed to resist the
earthquake forces. Adding fibres can ameliorate the brittle
characteristics of concrete members. When added to the
concrete mix as reinforcements, fibres have the potential to
increase the bond of the Portland cement paste and the
concrete matrix and improve the mechanical properties.
Therefore, the inclusion of fibres in concrete reduces the
acceleration of shear and flexural crack propagation.
Furthermore, the addition of fibre enhances the ductility of
the concrete and thereby improves its energy absorption
capacity.
A moderate earthquake measuring 5.9 on the Richter
scale had occurred in Ranau, Sabah. It had been recorded
the most powerful earthquake ever happened in Malaysia, in
the last 39 years since 1976. The moderate tremor was the
strongest earthquake that surpassed previous records that
occurred in 1976, measuring 5.8 on the scale Richter in
Lahad Datu, which caused a lot of damage to property and
buildings cracks.
It is recorded that four earthquakes had happened in
Ranau, first, in 1989 measured at 5.6 Ritcher scale, second
in 1991 (5.1 Ricther scale), third in March 2005 (4.1 Ritcher
scale) and the fourth in February 2010 (2.6 Ritcher scale).
Although Sabah is located outside the Pacific Ring of Fire,
a study from Research and Innovation Center of University

Malaysia Sabah has found that the area of Kundasang,
Ranau, Pitas, Lahad Datu, Kunah and Tawau has the risk of
earthquakes. In addition, Director of the center, Prof. Dr.
Felix Tongkul, who is also a fellow of the Academy of
Sciences Malaysia, stated that Malaysia’s position in the
neighbouring country that lies on the earthquake fault line
caused Malaysia also not spared from the felt of earthquake
[2]. Regarding the changes that can be seen after a year of
earthquake, Prof Dr Felix Tongkul stated that since the
earthquake strucked at Ranau, the government has begun to
focus on developing building that has earthquake resistant.
Malaysia had recorded 40 earthquakes in the last 10 years
(since 2007) and 37 from it had significantly appeared along
earthquake line at Bentong, Pahang. Three earthquakes had
occurred at Manjung, Perak and Jerantut, Pahang. The
entire event of earthquakes was detected near the area of
Bukit Tinggi and Janda Baik, which have an outline
measuring 15 km width and 70 km long. In addition, Bukit
Tinggi and Janda Baik are located above the fault line and it
may not surpass tremor measuring 5 Ritcher scale.
Therefore, it means that if earthquake occurs at any time it
may not damage the structure of the building [3]. This is
because there is threshold to make the structure of the
building to fail but if the tremor is not achieved the
threshold, so the structure will be safe. According to Dr
Rosaidi Che Abas, The Meterological Department Director,
to date, the earthquakes in Peninsular Malaysia are in the
range from 1 to 10 mile below the earth surface.
National Institute of Standards and Industrial Research
Institute of Malaysia (SIRIM) is also in the process of
designing a code for earthquake resistant building. In
addition, through a series of seminars organized by
University Malaysia Sabah (UMS) and government
agencies, people start too aware of the incident that
happened around them [4]. When the design code is
completed, it is expected that the design of building after
this will have the characteristics of earthquake resistant.
II. PHYSICAL DAMAGES EFFECT OF RESIDENTIAL
HOUSES BY THE EARTHQUAKE
Earthquake is a movement of earth plate and keep
actively move naturally on its’ fault line until today. Land
movement or earth settlement can cause damage to the
building. The consequence of this event caused many
building become defect. But, we also have to take
precaution in taking seismic design code for the building
that will be built. Even though we make assumption of
seismic design code and technology but try not to allow the
damage to the building under the maximum considered
level of earthquakes although earthquake risk still prevail
due to the uncertainty of the next earthquake magnitude [5].
A building might be damaged by the factor of
geotechnical deficiency such as fault rupture which causes
foundation damage, building differential settlement or soil
liquefaction, landslide and damage of retaining wall or by a
tilting neighbouring building without enough separation
distance [6].
Liquefaction and lateral spreading can occur in many
scales, in a range of ways including: total and differential
settlements and tilting; the effect of punching settlements of
structures with shallow foundations; differential movements
of components of complex structures; and interaction of
adjacent structures via common foundation soils [7].
According to this discourse, until they are met by
vulnerabilities such as an unsafe environment, fragile
socioeconomic structures, or lack of disaster preparedness,
hazards would remain only as natural phenomena. For
example, when a volcano erupts in an uninhabited place,
this is only a natural hazard not a disaster. When frequent
earthquakes affect settlements in, they do not usually
experience these as major disasters because of the country's
preparedness and mitigation measures [8].
It is the nature of many construction materials to crack
as they aged and as they expand and contract, particularly
with exposure to moisture as they get wet and dry out
alternately. There are cracks in common areas, such as
exterior walls, interior walls at corners of doors and
windows, and ceilings (usually in the middle). Crack defect
have classified of visible damage to walls. There are having
different state in category of damage, and degree of
damage. According to the construction theory, the
occurrence of wall crack is because of they are overloaded
or because the structure has settled or heaved. Vertical and
angled crack are usually caused by settlement or heaving
[5]. Wall may experience lot of defect due to its non-
reinforcement structure. The vibration from the earthquakes
makes the bricks vibrate too and cause the adhesive effect
of the concrete between the bricks disintegrates and
resulting wall defect. From our research area, we find that
the two types of wall, which are brick and timber, had
suffered failure due to earthquake but with different degree
of defect.
Reinforced concrete frame structure system should be
designed, as strong columns with weak beams to guarantee
the structure system should be a total damage mechanism.
Beam subjected to cyclic loading of the type expected in an
earthquake, the use of increased flexural reinforcement
(positive or negative) might increase the energy dissipation
capacity of the member [8]. In an adequately designed
lateral load-resisting frame under severe lateral loading,
plastic hinges (inelastic zones) will form in the beams rather
than in the columns. The moments and shears to which the
beams are subjected are a function of the flexural strength
of the members; the higher the strength, the greater the
imposed loads [9].
The relation of foundation and soil properties can affect
the whole structure of a building. Different area contains
several types of soil and as a result a proper foundation is
needed to setup for the building. Soil amplification factors
causing tremors of magnitude bedrock rises during
propagated to the ground. Genesis amplification can also
lead to poor soil known as liquefaction due to the existence
of an increase in pore water pressure and soil [10,11].
III. RESULT AND DISCUSSION
A survey was conducted to Ranau resident on
December 2016, six months after the earthquake. The total
of 221 respondents consists of female 56.6% and male
43.4% had been involved in the survey. We have collected
data for the salary per month of the respondent 27.6% of
respondents have salary per month ranging RM 1000 to RM
2499, 16.7% range in RM 2500 to RM 4999, 2.3% which
range in RM 5000 to RM 9999 respectively. Majority of the
respondents, which is 59.3%, are dwell from agriculture
sector since our research area is at Ranau which is the area
that is not yet to be industrialized. Other than agriculture

sector there is also tourism sector, which is 5.2%,
government is 32.6% and construction is 2.2%.
Most of the respondent lives in the house type of non-
terrace. They live in the rural area, which is not being in
highly developed area. Non-terrace owner has 85.1% and
terrace 14.9% for houses type of respondents. From the
data, we found that 95.9% are house owners while 4.1% are
living in the rented house.
The survey recorded 99% of respondent give the
feedback that they are shivered by the incident but 1% of
respondent claim that they did not feel the tremor. This is
maybe due to the psychological response to vibration
exposure above threshold is affecting the function of the
situation and type of exposure. It is because some people
have different sensitivity of stimuli towards the
surroundings. In addition, for an example if the movement
of the floor of an underground train were to be transferred
to the floor of a building, one would expect a somewhat
different response from those standing on that surface. So,
considering the relative importance of exposure to
earthquake vibration that might only be just above
perception of normal person thresholds, perhaps our
volcanologists and seismologists should continue
monitoring vibration that cannot be felt [12].
Fig. 1. Types of damage after earthquakes
Fig. 1 shows the percentage of damaged components of
residential building in Ranau. It is shows that wall have the
highest percentage of damage due to the earthquake. Since
the wall not have reinforcement like beam, slab and column
which have the allowed buckling so it more exposed to
cracking when the earthquake happened. Moreover, wall is
weak in resisting lateral loading that apply on
perpendicularly to the wall which is occur during
earthquake. Not only that, it might happen due to the
settlement of the house foundation. It makes the wall losing
its original geometry and therefore cracked occur. In the
area of Ranau there are houses that made from wood or
combine with concrete and wood. Then when earthquake
happen the wall that made from wood become warped. All
of the components have been identified from the
respondents. Damages in reinforced concrete buildings have
happened because of design and construction reasons such
as use of insufficiently resistant concrete, the weak
reinforcement of soft stories and column beam joints,
designs causing short columns, not caring for shear
reinforcement and use of strong beam-weak column [13].
Floor experience defect after the earthquakes happen.
When the earthquakes occur the ground is displace and
cause the floor to move also. Since the floor is fixed
because of the suspended slab it cannot withstand the
moment to the beam so it cannot support the loading form
that resulting crack at floor structure. Moreover, the slab of
the stairs also experience defect due to the earthquake
vibration. The slab of the stairs happens to cater the loading
created from the vibration since the slab is connected from
first floor and second floor.
Column is another component of structure that have
defect after earthquake event. It is due to the fixed support
that cannot move freely when the tremor happens. Column
is good in resist vertical loading but weak when it received
horizontal loading. It happens when it cannot withstand a
certain value of loading so it will form cracks. The cracks
commonly form at the joint of the column because the area
is enclosed by the highest moment if the column is in fixed
support. In addition, some of column have defect at its
finishing because the finishing is not well prepared.
The loading from the earthquake to the column cause
the column to fail in many ways. There are different types
failure with the type of columns, which are short column
and long column. Short column will fail directly at the
maximum stress that it can withstand but for long column
the failure is when it buckles on the application of load.
Column is in fixed support and it will act as a portal
frame for the whole structure. The tremor from earthquake
will produce some frequency and the whole structure will
respond to the frequency by moving within its’ own
frequency. As the building is moving back and forth all
items also move together. Fig. 1 also has shown 43.4% of
respondent experience items that fall uncluttered inside their
house.
Wall has recorded the highest percentages of damaged
structure because the wall depends on the brick strength and
been fixed on the slab and column. Thus, it cannot
withstand higher loading than other types of structures.
Unlike beam, column and slab it have reinforcement that
can withstand high moment and shear force. In addition,
when earthquakes happen the whole structure would be
vibrating and cause the wall to vibrate too then the wall
cannot withstand the moment created from the displaced
columns or beams resulted the wall is cracked. Some of the
brick walls have X-mark cracked which means the wall is
experience shear failure due to weak load bearing wall.
Other than brick wall, timber wall shows that the wall is
buckle from the vibration of earthquake cause the timber
wall is resisting the load.
Roof has recorded 10% of the damages because it is not
fixed at beam or column but only as a pin supported. When
earthquake happen the roof only vibrate together since it not
fixed supported the moment created from the earthquakes
had been eliminated.
Fig. 2. Damage on house yard

Fig. 2 shows that 54.8% reported experience soil
rupture. It happens when the earth techtonic plate move so
resulting the soil rupture. As the earth techtonic plates is
move, it create an energy that accumulate and it will release
the energy. Effect of the earthquakes makes the section of
soil displaced so the result there is liquefaction in a
subsurface layer. Furthermore, horizontal displacements on
lateral spreads usually ranged up to several metres so it is
possible that the ground rupture that form is clearly can be
noticed.
Fig. 3. Non-structural effects after earthquakes
Fig. 3 shows the percentage of non-structural effects to
the respondent houses due to the earthquake event. 27.1%
shows the defects percentages, which are the mud flood,
drainage defect, water supply problem, no electricity,
settlement of building. There is analysis to determine the
economic flood damages. First is the analysis to the
structural damage caused by the flood effects. The degree of
structural damage depends on the intensity and magnitude
of the flood actions such as hydrostatic and hydrodynamic
forces that act to building’s resistance by flood.
Next, the economic valuation of the physical damages
estimate by the damage estimation in monetary terms will
also involve an assessment of the damage to the inventory
of the structure [14]. When earthquakes happened the river
had leak and cause the water to throw out from its pathway.
Riverbanks collapse and cannot hold the water in the river
and cause the flood to happen. This failure is due to the
ground settlement near the river valley because it loses its’
strength due to no suction of water by sandy soil at the river
banks because the sand at river bank had become saturated
due too much of water pouring inside the voids. Thus, there
is no air voids left in the sand at the river banks. As a result
the sand loses its bearing capacity and the sand near the
river banks settle down cause the flood [1]. This event
causes many villagers experience water supply problem
because the sediment and debris had been clogged at the
water treatment plant. It is recorded 25.3% of respondent
had this problem. Furthermore, it is small percentage of
respondent that face fire event at their place due to the short
circuit that happen during the event.
Fig. 4 shows that the percentage estimation of loss from
the respondents. The large of percentage of loss is 29.9%,
which is range from RM 1000-RM 5000. This loss can be
classified into two major losses, which are structural loss,
and non-structural loss. But from our data the major loss is
from non-structural loss. Furthermore, from this data we can
see the effect of the earthquake to the loss which are varies
since the residential building is located at the difference
geographical area that have many types of foundation that is
suited to the area.
Fig. 4. Estimation loss after the earthquake
In addition, we expect percentages of estimation loss
will be reduced after the implementation of Affordable and
Innovative Earthquake Resistance (AIER) system which is
that suit for many types of foundation.
Cost-benefit analysis has been used to evaluate the
effectiveness of mitigation or retrofit strategies under one
hazard or multiple hazards [15]. This is to perform seismic
life-cycle cost–benefit analysis. Furthermore, from the
recorded data the estimation loss is to make a basis of
reference for estimation of the cost of AIER system. The
importance of the analysis is to enable house owners to
tolerate the cost and benefit of hazard mitigation efforts to
target specialized construction practices that are likely to
cost effectively mitigate losses [16]. Thus, this method can
give the overview from the basic to the top of this
implication of application of this system.
From the survey, 91.8% of respondent are willing to
make changes of their house structure for application of the
AIER system and the extra 8.2% is not willing to do so.
Therefore, AIER is relevant and should be applied due to
people requests. Moreover, it also environmental friendly
since the system use recycled material and it is easily to get
the material.
In the hazard mitigation decision making process, other
factors involving economic, physiological, and social
aspects play an essential role [17]. The perspective of the
house owners is to consider the expected goodness that is
bigger than cost of retrofit measure. In addition, the
decision of the owners’ is influenced by many aspects for
investing on their houses for future courses and expenses
that they have to bare with.
Moreover, the explanation of the system is very
important to gain the trust of the respondent and so that they
can make decision whether agree or not agree to modified
their house. This was explained by [18] how individuals
perceive and process information regarding risk with
relatively low probability is a dominant factor regarding
decision making.

Fig. 5. Estimation cost for the AIER system
Fig. 5 shows the percentage of the respondents that are
willing to expend their money for the application of this
system. It is shows that 37.6% of the respondent cannot
afford the system. But, 21.7% of respondent is willing to
afford the system for less than RM499. There is slightly
different in percentage between respondent 14.5% and
16.7% which are agree to expend their money. From this
data the price of the system will be known with better
material of the system.
There are many aspects need to account for decide the
better cost of this AIER system so that it will benefit to both
of the parties. Since 37.6% of respondents choose not to
afford this product but still there are others respondent are
willing to invest their money for the better and safe home.
Hence, there is still lot more of research to improve the
existing product to make more safe and affordable product.
IV. CONCLUSION
From this research it can be concluded that the physical
damages effect on residential houses caused by the
earthquake at Ranau, Sabah Malaysia can be reduce by
implementing AIER system at the residential houses since
analysis of the type of failure and how to overcome such
problems had been conducted.
Since the area of Ranau is located on the active fault
line and some of the residential was built at the slope area
so the application of the rubber foundation still need to be
improved because the main problem still cannot be solved
because the soil can adrift the foundation in the soil. But,
this effect can be reduced by strengthening the joint by
applying the bracing to reduce the impact of the
earthquakes. Not only that, for the next development it is
relevant to account the seismic design into every building in
the earthquake potential area.
Further research on best and affordable price and cost
for the AIER system can be done by the estimation loss
after the earthquake and estimation cost for the AIER
system.
ACKNOWLEDGMENT
Muhamad Azry Khoiry wish to express gratitude toward
Universiti Kebangsaan Malaysia (UKM) for funding this
research under university research grant awarded
Development of Affordable and Innovative Earthquake
Resistance (AIER) System for Low-rise Residential
Buildings (AP-2015-011).
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Muhamad Azry Khoiry was born in Kuala
Lumpur, Malaysia in 1988. He received the B.Eng.
(Civil & Structural Engineering) and Ph.D. (Civil &
Structural Engineering) degrees from Universiti
Kebangsaan Malaysia, Bangi, Malaysia, in 2011 and
2015, respectively. In 2016, he joined the
Department of Civil & Structural Engineering,
Faculty of Engineering and Built Environment, The
National University of Malaysia as a Senior
Lecturer. His current research interests include
construction management, project management and engineering education,
with over 50 publications. Dr Azry Khoiry are registered graduate engineer
under Board of Engineer Malaysia (BEM).