Retrofitting earthquake protection could save lives

June 5, 2013

Whether or not a building collapses and claims many lives during an earthquake is a matter of structure and statistics, according to researchers in Turkey. Writing in the International Journal of Emergency Management, civil engineer Kubilay Kaptan of Istanbul Aydin University, explains how preventing total building collapse during an earthquake could be as straightforward as identifying and reinforcing those structures susceptible to serious damage.

Kaptan points out that severely damaged but non-collapsing buildings are a major hazard but the occupants often have time to escape. Most lives lost during a major are taken by those buildings that collapse quickly and completely. Reinforcing all the buildings in a city in an , such as Istanbul, would, Kaptan estimates, cost US$18billion and take two decades to complete. However, he has devised an analytical approach to determining in advance which buildings are most likely to collapse fully. If only the most at-risk buildings are retrofitted with earthquake-resistant reinforcements, the cost would be less than US$1billion.

The researchers suggest a two-phase approach to the problem. In the first phase, all buildings across the city, public or private, school, hospital and would be inspected visually and photographs taken. Information on ownership, plans, , load-carrying systems, walls and irregularities, such as subsidence, etc would be recorded. Simple calculations could then reveal which are most "collapse susceptible". In the second phase, a non-linear analysis would be performed to determine which of those would most likely collapse under specific quake conditions. Kaptan adds that a building "rehabilitation" program should be implemented once such surveying and analyses have been carried out to strengthening the buildings most at risk.

This approach to risk management in city plagued by earthquakes could lead to an essentially zero loss of life risk due to total collapse of buildings. If a price is to be put on life in the city, then the costs of analysing the several million buildings would cost less than a twentieth of simply retrofitting all buildings built after the stringent earthquake building code of 1975 was first updated in 1998.

Explore further: Iowa State engineer studies damage caused by New Zealand earthquake

More information: "Zero loss of life during natural hazards" in Int. J. Emergency Management, 2013, 9, 37-45.

Related Stories

Lessons from the Christchurch earthquake

November 21, 2011

(PhysOrg.com) -- A leading Infrastructure academic believes an assessment needs to be made of the level of "very rare" earthquake that needs to be considered in structural design, perhaps one with a 10,000 year return period ...

Should we better prepare for earthquakes?

December 15, 2011

University of Adelaide researchers are leading an international project to help identify buildings most vulnerable to earthquakes and the best ways to strengthen them.

Seismic fabric coming to the market

January 7, 2013

In the case of earthquakes, only seconds may remain for a safe escape from buildings. Debris falling down and obstructing the escape routes may even aggravate the situation. A product developed at Karlsruhe Institute of Technology ...

Recommended for you

How to curb emissions? Put a price on carbon

September 3, 2015

Literally putting a price on carbon pollution and other greenhouse gasses is the best approach for nurturing the rapid growth of renewable energy and reducing emissions.

Customizing 3-D printing

September 3, 2015

The technology behind 3-D printing is growing more and more common, but the ability to create designs for it is not. Any but the simplest designs require expertise with computer-aided design (CAD) applications, and even for ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.