What is Structural health monitoring (SHM)

Structural
health monitoring (SHM)
Civil
infrastructures such as bridges, viaducts, buildings, dams etc. are valuable
national assets that must be maintained to ensure public safety. In a modern
society, these structures facilitate our transportation networks, industrial
activities, and everyday life.
What is Structural health monitoring (SHM)

What is Structural health monitoring (SHM)

Currently, most
of these infrastructures especially bridges, are either reaching
their design lives or have passed their service period so they need to be
replaced or retrofitted to remain in service, hence an effective structural
health monitoring system is the only key to accomplish the aforementioned
tasks.
What is Structural health monitoring (SHM)

Continuous
evaluation of structural condition and timely maintenance of infrastructures
offers the opportunity to prevent the catastrophic collapse and increase the
life of structures.
Every
structure deteriorates with time due to numerous reasons such as fatigue,
effects of environmental conditions, damages due to aging, destructive events
like earthquakes or wind-induced vibrations, and floods etc. These
circumstances require routine or critical-event based assessments as a means of
continuous monitoring of a structure to provide an estimate of changes in
dynamic properties such as mass, stiffness and dampness etc. as a function of
time and an early warning of an unsafe condition may be issued. Continuous
monitoring systems allows for structural monitoring immediately after natural
hazards (earthquake, flood and tornado) and man-made disasters (arson and
terrorist bombing) reducing the impact of such disaster both economically and
socially.
What is Structural health monitoring (SHM)

Thus, above discussion elaborates the importance
and needs of health monitoring of structures that has been a concerned research
topic of structural engineering in recent years.
The
ultimate goal of Structural Health Monitoring is to predict the remaining life
of structures e.g. bridges, viaducts or buildings etc. so that an efficient
repair or replace program may be executed.
While implementing
structural health monitoring techniques, its major damage identification levels
are needed to be observed viz. identification of existence of damage, damage
location identification, extent and type of damage and determining remaining
life of structure, respectively. Many methods and instruments are present to
estimate these damage identification levels like Strain gauges, inclinometers,
Eccentric Mass Vibrator (EMV), Lesser Doppler Vibrometer (LDV), Integrated
Accelerometer system, fiber optical sensors and Wireless sensors etc. This is
very important to know that these methods or instruments are only helpful for
first three damage identification levels and the last level i.e. predicting remaining
life of the structures is still a great challenge and a crucial research field.
Methods
that efficiently use wireless sensing devices for damage detection are either
nonexistent or under development.
What is Structural health monitoring (SHM)

Wireless
sensors technology is new for structures with following advantages:
·      
Wire handling problems
eliminates
·      
Saving installation and
maintenance cost
·      
Reduced fabrication cost
·      
Real time computational ability.
What is Structural health monitoring (SHM)

With the help of developed Wireless sensing devices local damage
would be better identified which contributes to effective structural health
monitoring and in assessing remaining life of the structure which is ultimate
goal of the structural health assessment.
Saad Iqbal
Hi there, I am Saad Iqbal from Pakistan. I am an enthusiastic blogger, passionate content creator, construction geek, and a creative graphic designer. Connect with me at my social channels.