Massachusetts Institute of Technology
Sign in

Engineering for the Ecological Age: Lessons from History

05/01/2009 2:00 PM Bartos theater
John Ochsendorf, Associate Professor, Department of Architecture

Description: John Ochsendorf, a structural engineer, "fell in love with archaeology" during college. His senior thesis at Cornell involved a 600"year"old Incan suspension bridge made entirely out of grass. Ochsendorf learned that this apparently primitive structure owed its astonishing longevity to regular rebuilds by the locals (during a community festival), and the use of renewable, biodegradable resources. While Cornell's engineering faculty couldn't see the point of this research -- "grass bridges over highway overpasses"? -- Ochsendorf realized that historical structures held important lessons for modern building technology.

The grass bridge raised several problems that now consume Ochsendorf's academic and professional life. First, how to consider the whole life of a product when designing it, of particular import since "the 21st century is going to be a wild ride in terms of natural resources," says Ochsendorf. Some building costs increase over time, consuming material and labor while deteriorating (nb: New York's 1903 Williamsburg Bridge, with $1 billion in repairs, and still unsafe at any speed).

Ochsendorf suggests alternatives: making permanent structures with high quality construction and reusable materials (such as Roman stone arch bridges); very temporary structures, such as the grass bridge, or a Japanese pavilion made out of recycleable paper; or modular structures designed to change over time. Ochsendorf created "a medieval building for the 21st century," a sustainable home made out of waste clay tiles, rammed earth from local chalk, and a heavy green roof on which sheep graze.

Ochsendorf also studies the integrity of existing historical structures: how to guarantee the safety of a medieval cathedral, or a 19th"century train station. The Pantheon's stood for 2000 years, a brittle structure that inevitably develops cracks. Engineers today can't say for sure "if something will fall down." Ochsendorf is creating engineering tools to vouch for the masonry, steel and concrete holding up both historical treasures and more commonplace infrastructure. He is also working on high tech tools so engineers can examine building designs before construction to ensure "safe results," and to create structures that will consume less energy and emit fewer greenhouse gases during their lifetimes. As composers know Mozart, and philosophers know the works of Plato, concludes Ochsendorf, the next generation of engineers must review the works of their forebears, if they're to maintain existing infrastructure, and create better designs for the future.

About the Speaker(s): John Ochsendorf is a structural engineer and architectural historian who works to preserve historic structures and to reinterpret ancient technologies for contemporary use. Ochsendorf has studied a variety of alternative engineering traditions, including hand"woven, fiber suspension bridges of the Inca Empire. He has also investigated suspension and cable"stayed bridges in Japan. More recently, Ochsendorf has explored the structural safety of such historic monuments as French and Spanish Romanesque churches.

Ochsendorf received a B.Sc. (1996) from Cornell University, an M.Sc. (1998) from Princeton University, and a Ph.D. (2002) from Cambridge University. He received the National Endowment for the Arts Rome Prize for 2007"2008, and was a Fulbright Scholar at the Escuela T_cnica Superior de Arquitectura, Madrid, Spain.

Host(s): School of Humanities, Arts & Social Sciences, Program in Science, Technology and Society

Comments (0)

It looks like no one has posted a comment yet. You can be the first!

You need to log in, in order to post comments.

MIT World — special events and lectures

MIT World — special events and lectures

Category: Events | Updated 12 months ago

More from MIT World — special events and lectures

Descent into Limbo

Descent into Limbo

Added almost 5 years ago | 01:29:00 | 4497 views

Introduction to Cancer Genetics

Introduction to Cancer Genetics

Added almost 5 years ago | 00:55:15 | 4951 views

Doing R&D Smarter: A More Effective Approach to Industrial R&D

Doing R&D Smarter: A More Effective...

Added almost 5 years ago | 01:10:00 | 2782 views

Environmental Impacts of Aviation

Environmental Impacts of Aviation

Added almost 5 years ago | 01:02:00 | 8685 views

The Future of Civic Engagement in a Broadband"Enabled World

The Future of Civic Engagement in a...

Added almost 5 years ago | 00:35:08 | 10584 views

Looking Ahead to the Future of NASA

Looking Ahead to the Future of NASA

Added almost 5 years ago | 00:59:47 | 11935 views