August 30, 2005

Toughness of the Pentagon Structure

By: Donald Dusenberry, Mlakar, P.F., Harris, J.R., Haynes G.A., Phan, L.T., Sozen, M.A.

Abstract: On September 11, 2001, the reinforced concrete structure of the Pentagon Building was able to resist, without collapse, the impact of a large commercial airliner despite the total loss of 26 columns and severe damage to 15 columns at...

August 30, 2005

Conclusions and recommendations from the Pentagon crash

By: Donald Dusenberry, Mlakar, P.F., Harris, J.R., Haynes, G.A., Phan, L.T., Sozen, M.A.

Abstract: The devastation in the September 11, 2001 terrorist attack on the Pentagon was reduced by the building's resilient structural system. The continuity, redundancy, and energy-absorbing capacity embodied in this system should be...

August 30, 2005

A 60 Year Retrospective

By: Cash, Carl G.

Abstract: The roofing industry has changed dramatically in the last 60 years. This interval saw new materials, new manufacturing and installation methods, and the decline and loss of some of our oldest and best standbys. Let us try and look at...

August 30, 2005

Take That: The Art of Borrowing from Elsewhere

Abstract: The history of architecture has been largely a history of borrowing and adapting forms, styles, materials, and techniques from elsewhere, from other places and other times.

August 30, 2005

Description of Structural Damage Caused by the Terrorist Attack on the Pentagon

By: Donald Dusenberry, Mlakar, P.F., Harris, J.R., Haynes G.A., Phan, L.T., Sozen, M.A.

Abstract: On September 11, 2001, an airliner was intentionally crashed into the Pentagon. It struck at the first elevated slab on the west wall, and slid approximately 310ft (94.5m) diagonally into the building. The force of the collision...

July 30, 2005

Live load distribution widths for reinforced concrete box sections

By: Jesse Beaver, McGrath, Timothy J., Atis Liepins

Abstract: AASHTO introduced the AASHTO "LRFD Bridge Design Specifications" in 1994. These load and resistance factor design (LRFD) specifications included new provisions for distributing live loads to reinforced concrete bridge decks...

May 30, 2005

Building Design for Abnormal Loads and Progressive Collapse

By: Donald Dusenberry, Ellingwood B.R.

Abstract: A progressive collapse is a structural failure that is initiated by localized structural damage and subsequently develops, as a chain reaction, into a failure that involves a major portion of the structural system. The collapse of the...

May 30, 2005

Finding a Better Measure of Fenestration Performance:  An Analysis of the AAMA Condensation Resistance Factor

Abstract: As architectural products become more advanced, making comparisons between them becomes more difficult for designers. This is especially true in the case of fenestration products (e.g., windows, skylights, and curtain walls). The...

April 29, 2005

Professor Robert H. Scanlan and the Tacoma Narrows Bridge

Abstract: Among other pursuits, the late Dr. Robert H. Scanlan worked for nearly 40 years to understand the problem of bridge-deck flutter. This paper presents an overview of his work, with particular attention to the original investigative work...

April 29, 2005

Wall Cladding System Durability Lessons Learned from the Premature Deterioration of Wood-Framed Construction Clad with Exterior Insulation and Finish System (EIFS) in the U.S.

Abstract: Despite well-intended laboratory testing of individual materials and components, unanticipated and severe durability failures of building wall systems can occur when the system design does not adequately integrate the various materials...