Survey of Damage from Japan’s March 11th Earthquake and Tsunami, presentation by Kit Miyamoto

April 5th, 2011 No comments

A colleague forwarded a link to a very interesting presentation by a Japanese engineer who surveyed the earthquake damage at various locations along the coast. It contains a lot more engineering information than all of the media reports I have seen.

Some interesting notes:

  • Strong shaking does not seem to have caused much if any structural damage. Tsunami damage was the dominant event.
  • Some types of construction (steel, concrete) resisted the tsunami better than others (wood).
  • He estimates that Tsunami warning systems that were in place saved hundreds of thousands of lives.

Here’s the link: http://peer.berkeley.edu/events/2011/03/early-field-survey-miyamoto-japan-eqk/

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Zoom into Concrete and Steel

September 1st, 2009 No comments

These narrated videos slowly zoom in to several million times magnification, which is enough to see the chemical composition of concrete and steel.

This information may not be directly applicable to structural analysis or design on a daily basis, but it can’t hurt to have some material science background on the materials with which we build.



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Building Collapse in Shanghai

July 29th, 2009 No comments

You’ve all seen the pictures (linked at the bottom of the post) of the spectacular building collapse in Shanghai. At around 5:30am on June 27, an unoccupied building still under construction at Lianhuanan Road in the Minhang district of Shanghai city toppled over. One worker was killed.

These figures show why the building collapsed. The images are from a Chinese newspaper and from the bbs.sina.com.cn website. The translations were forwarded to me in an email (Unfortunately, I can’t read Mandarin).

image013

(1) An underground garage was being dug on the south side, to a depth of 4.6 meters
(2) The excavated dirt was being piled up on the north side, to a height of 10 meters
(3) The building experienced uneven lateral pressure from south and north
(4) This resulted in a lateral pressure of 3,000 tones, which was greater than why the pilings could tolerate. Thus the building toppled over in the southerly direction. Read more…

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Best Practice Guidelines for Structural Fire Resistance Design of Concrete and Steel Buildings (NISTIR 7563)

April 15th, 2009 No comments

It may be too late to send comments on the report, but it is still available to download and read. Via the NIST.gov website:

A new draft report released for public comment by the National Institute of Standards and Technology (NIST) provides a comprehensive set of best practice guidelines for designing building structures to resist major fires. The document, NISTIR 7563, Best Practice Guidelines for Structural Fire Resistance of Concrete and Steel Buildings, is part of the NIST response to the World Trade Center (WTC) disaster of Sept. 11, 2001, and was developed in conjunction with the agencys technical building and fire safety investigation of WTC buildings 1 and 2 (the WTC towers) and 7. Read more…

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Worlds tallest buildings reach completion simultaneously with onset of major recession

February 25th, 2009 No comments

Via Council on Tall Buildings and Urban Habitat:

The year 2008 will long be remembered as the start of an economic crisis that has gripped the entire globe a year that may also have brought to an abrupt end the worldwide construction boom of the past decade that has seen ever-denser cities containing ever-taller buildings proposed from Madrid to the Middle East, from Shanghai to San Francisco. As financial shock waves have reverberated around the world, high-profile tall building projects in virtually all skyscraper cities have been cancelled, delayed, or put on hold in response to the precarious global economic conditions. The question that everyone is now asking is this the end of the tall ambitions of places such as Moscow, Chicago or Dubai for the short-mid term future?

The correlation between tall buildings and economic recession is not a new one. In 1999 the economist Andrew Lawrence created the Skyscraper Index showing how almost all of the worlds tallest buildings throughout history have reached completion virtually simultaneously with the onset of a major economic recession. Using the research and criteria of the Council on Tall Buildings and Urban Habitat (CTBUH), and specifically their annual Ten Tallest Buildings Completed Annually and projected Tallest 20 in 2020 research, this paper seeks to examine further the link between skyscrapers and economic cycles, and suggest how the current economic crisis will affect tall building developments in the next decade or so.

(link to PDF of article)

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ASCE Releases 2009 Report Card for Americas Infrastructure

January 28th, 2009 No comments

Via ASCE

Dear ASCE Member,

Today, the American Society of Civil Engineers issued its latest Report Card for Americas Infrastructure, the fourth since 1998. Never has the need for infrastructure investment received such national attention as it is now in the context of stimulating our economy. Recognizing the importance of informing and contributing to this discussion in a timely manner, we made the decision to release the key components of our 2009 Report Card two months ahead of schedule. Today ASCE released the grades for 15 categories of infrastructure, solutions for improvement, and a five year investment need figure.

The overall grade for the nations infrastructure is again a D and the cost to bring it up to good condition has risen to $2.2 trillion. In more than a decade, the United States has made no measurable progress in improving either the condition or performance of our roads, bridges, water systems or other vital infrastructure when viewed in aggregate.

Category Grade
Aviation

D

Bridges

C

Dams D
Drinking Water D-
Energy (Electric Power Grid) D+
Hazardous Waste D
Inland Waterways D-
Levees

D-

Public Parks and Recreation C-
Rail C-
Roads D-
Schools D
Solid Waste C+
Transit D
Wastewater D-

Read more…

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Make It Work: Engineering Possibilities (exhibition in NYC)

January 22nd, 2009 No comments

via AIA-NY Chapter

Today’s engineers are working across disciplines and driving innovation. MAKE IT WORK. Engineering Possibilities looks at how engineers are envisioning and realizing the future of our built environment by transforming structures, improving environments, enhancing materials, re-inventing building technologies, and advancing forms. This exhibition highlights how inventive strategies for building are born from multidisciplinary research and integrated practice. Small engineering firms, large engineering firms, engineering schools, university labs, materials labs, artists, inventors, and architects are all part of the exchange of ideas plotting trajectories of innovation. Read more…

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ASCE Announces Early Release of 2009 Report Card for America’s Infrastructure

January 16th, 2009 No comments

This was sent to ASCE members this morning:

Dear ASCE Member,

Infrastructure is receiving unprecedented attention from President-elect Obama, the U.S. Congress, and the media. ASCE finds itself at a crucial moment to spread our message and participate in the dialog regarding infrastructure improvements.

Yesterday, the House Appropriations Committee released a summary of the House Democratic Leadership’s proposed economic stimulus package, the American Recovery and Reinvestment Act of 2009. Included in the infrastructure and science portions are many of ASCE’s priority issues. For details on the package, visit ASCE’s Government Relations blog.

On January 28, 2009, ASCE will issue important components of our 2009 Report Card for Americas Infrastructure, including letter grades with short conditions summaries for each of 15 categories, solutions for infrastructure improvement, and an overall cost to improve the nations infrastructure. The nations leaders rely on ASCE to provide expert advice on the condition of the nations infrastructure. Early release of the 2009 Report Card is essential to fulfilling that role. Read more…

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William G. Godden Structural Engineering Slide Library

January 3rd, 2009 No comments

From UC Berkeley’s Earthquake Engineering Resource Center:

The Structural Engineering Slide Library was collected over the period 1950 through 1980. It was developed as a visual resource for illustrating structural systems in undergraduate courses in structural analysis and design. Each structure is identified, and a brief description is given.

When I was a TA for a freshmen introduction to structural engineering course, these slides were helpful in providing “real world” illustration of some of the idealized conditions that we were studying.

For example, when explaining about pin and roller supports, it’s helpful to show what a pin (left), and a roller (right) really look like. Read more…

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Christmas for engineers

December 24th, 2008 No comments

christmas_for_engineers This landed in my inbox this morning, and I wanted to share it. (I am not the author).

Happy Holidays!

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