When earthquakes occur, it is the older buildings that often collapse first because they are not engineered to resist powerful earthquake forces. Those newer buildings, however, that look structurally sound often sustain non-structural damage that, despite appearances, can become unusable. This is what happened last week in Christchurch, resulting in many buildings that can no longer be occupied.
Last week our firm sent in an investigative team of structural engineers to assess the damage to Christchurch. As engineers, what we found was quite shocking but not unexpected: 30-50% of buildings constructed of unreinforced masonry (URM) sustained severe damage or collapsed. By comparison, the total damage in Port-au-Prince, Haiti as a result of last year’s earthquake was less from a percentage standpoint than what was experienced in downtown Christchurch last week. Several older non-ductile concrete buildings (existing structures that fail in a brittle manner under the load of an earthquake) have also been severely damaged or collapsed.
These findings provide proof that countries and cities that do not have mandatory retrofit ordinances for hazardous buildings are exposed to tremendous risk – not only in New Zealand, but everywhere else in the world.
Our team also observed that many, newer buildings experienced significant non-structural damage, which is dangerous for building inhabitants and greatly impacts functionality and business continuity.
People in cities situated in areas of high earthquake risk may have a false sense of security because they do not fully understand the intent of most building codes and equate code compliance to mean earthquake-proof. In fact, even in advanced earthquake engineering countries such as New Zealand, the US and Japan, most building codes are minimum guidelines for “life safety” only and have often proven to be inadequate for building sustainability, and at times, survivability.
Buildings must be better designed for disasters. Mandatory URM and non-ductile concrete structure retrofit ordinances must be put in place to save lives. And high-performance earthquake engineering must be practiced for sustainability of new buildings so they can support continued functionality of cities after a disaster. This must be done worldwide.
Together with my team, I have spent the past 13 months in Haiti working with the Ministry of Public Works, the United Nations and the Pan American Development Foundation assisting Haitian engineers to assess the damage to 400,000 buildings and repair 2,000 damaged houses as a USAID pilot project. The tragedy has to be experienced to be understood. Hiroshima is one of the great disasters of the twentieth century and has a firm place in our historical imaginations. The bomb killed 200,000 people. Yet, in terms of the loss of human life, Haiti’s earthquake caused even greater loss – over 230,000 lives.
The unfortunate truth is that engineers have predicted major earthquakes in Christchurch and Port-au-Prince for years. Of course, we could not say when but we knew there was a high probability of another earthquake. Little was done by the respective governments or the private sector. How distressing to realize that with proper engineering, much of the loss of life, structural damage and financial loss could have been reduced significantly.
Today, we know enough about constructing seismic-resistant buildings that allow them to withstand large earthquakes, protect their inhabitants and allow businesses to continue functioning. That said, today’s earthquake damage repair technology has also advanced so that in the next 24 months 100,000 homes in Haiti can be repaired with local materials and masons so that they are safer than before and can be reoccupied by their inhabitants, allowing them to leave the terrible conditions in the tent cities.
Preparing for disasters is not difficult. Responsible governments, the private sector and residents must act on the knowledge that these events can be anticipated and preparations must be made for their eventual occurrence, thereby saving lives and minimizing damage.
Dr. Miyamoto is President and CEO of Miyamoto International, a global earthquake and structural engineering firm.
Related Stories
Airports | Jul 18, 2022
FAA will award nearly $1 billion for airport projects
The Federal Aviation Administration (FAA) will award nearly $1 billion to 85 airports of all sizes across the country to improve terminals.
Building Team | Jul 18, 2022
Understanding the growing design-build market
FMI’s new analysis of the design-build market forecast for the next fives years shows that this delivery method will continue to grow, despite challenges from the COVID-19 pandemic.
Mixed-Use | Jul 18, 2022
Mixed-use development outside Prague uses a material made from leftover bricks
Outside Prague, the Sugar Factory, a mixed-used residential development with public space, marks the largest project to use the sustainable material Rebetong.
Building Team | Jul 15, 2022
ABC: Construction materials prices increased in June, up 20% from a year ago
Construction input prices increased 1.9% in June compared to the previous month, according to an Associated Builders and Contractors analysis of U.S. Bureau of Labor Statistics’ Producer Price Index data released today.
Arenas | Jul 15, 2022
U. of Oregon renovation aims for ‘finest track and field facility in the world’
The renovation of the University of Oregon’s Hayward Field had the goal of creating the “finest track and field facility in the world.”
Building Team | Jul 14, 2022
ABC’s construction backlog inches lower in June; Contractor confidence falters
Associated Builders and Contractors reports today that its Construction Backlog Indicator fell 0.1 months in June and stands at 8.9 months, according to an ABC member survey conducted June 21 to July 5.
Sustainable Development | Jul 14, 2022
Designing for climate change and inclusion, with CBT Architects' Kishore Varanasi and Devanshi Purohit
Climate change is having a dramatic impact on urban design, in terms of planning, materials, occupant use, location, and the long-term effect of buildings on the environment. Joining BD+C's John Caulfield to discuss this topic are two experts from the Boston-based CBT Architects: Kishore Varanasi, a Principal and director of urban design; and Devanshi Purohit, an Associate Principal.
Multifamily Housing | Jul 14, 2022
Multifamily rents rise again in June, Yardi Matrix reports
Average U.S. multifamily rents rose another $19 in June to edge over $1,700 for the first time ever, according to the latest Yardi® Matrix Multifamily Report.
Building Team | Jul 14, 2022
Austin PBS gets a new state-of-the-art facility with three studios
Since the 1970s, Austin PBS, birthplace of the Austin City Limits TV series, has been based inside the communications building on the University of Texas campus—a space it has long outgrown.
Building Team | Jul 13, 2022
The YIMBY movement emerges as valuable advocate for affordable housing
Over the past few decades, developers grew accustomed to nothing but staunch opposition to dense affordable housing project proposals.