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Author: hai lew

Displaying records 11 to 20 of 49 records.
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11. Assessment of Robustness and Disproportionate Collapse Vulnerability of Steel Moment-Frame Buildings
Published: 8/19/2009
Authors: Joseph A Main, Fahim Sadek, Hai Sang Lew
Abstract: Several prototype steel moment-frame buildings have been designed for the purpose of assessing their vulnerability to progressive collapse. The buildings were designed for moderate and high seismic regions. This paper summarizes the development of th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902887

12. Gypsum Stairwell Enclosure Wall System Tests under Uniform Static Pressure
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7615
Published: 7/22/2009
Author: Hai Sang Lew
Abstract: The importance of the structural integrity of the exit stairway enclosures was clearly shown by the collapse of the World Trade Center Towers. The investigation report of the National Institute of Standards and Technology recommended that the design, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903136

13. Testing and Analysis of Steel Beam-Column Assemblies under Column Removal Scenarios
Published: 5/6/2009
Authors: Fahim Sadek, Joseph A Main, Hai Sang Lew, Stephen D Robert, Vincent Chiarito
Abstract: This paper presents an experimental and analytical assessment of the performance of steel beam-column assemblies with two types of moment-resisting connections under vertical displacement of a center column, simulating a column removal scenario. The ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902595

14. Final Report on the Collapse of World Trade Center Building 7. Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1A) ***DRAFT for Public Comments***
Series: National Construction Safety Team Act Reports (NIST NCSTAR)
Report Number: 1
Published: 8/1/2008
Authors: Richard George Gann, William L. Grosshandler, Hai Sang Lew, Richard W. Bukowski, Fahim Sadek, Frank W Gayle, John L Gross, Therese P McAllister, Jason D Averill, James R. Lawson, Harold E. Nelson, Stephen A Cauffman
Abstract: This is the final report on the National Institute of Standards and Technology (NIST) investigation of the collapse of World Trade Center Building 7 (WTC 7), conducted under the National Construction Safety Team Act. This report describes how the fir ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909254

15. PERFORMANCE OF SEISMIC MOMENT RESISTING CONNECTIONS UNDER COLUMN REMOVAL SCENARIO
Published: 4/9/2008
Authors: Fahim Sadek, Hai Sang Lew, Joseph A Main, John L Gross
Abstract: Beam-to-column moment connections in steel frame construction have been studied extensively for seismic applications.  However, the behavior of such connections has not been studied under the monotonic loading conditions expected in progressive ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=861512

16. Best Practices for Reducing the Potential for Progressive Collapse in Buildings
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7396
Published: 2/1/2007
Authors: Bruce R. Ellingwood, Robert Smilowitz, D O Dusenberry, Dat Duthinh, Hai Sang Lew, Nicholas J. Carino
Abstract: This document is intended to provide owners and practicing engineers with current best practices to reduce the likelihood of progressive collapse of buildings in the event of abnormal loading. The report includes a discussion of an acceptable risk ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860696

17. A Summary of Reconnaissance of the Clinton, MO Elks Lodge Building Collapse on June 26, 2006
Published: 7/12/2006
Authors: Hai Sang Lew, Long Thanh Phan
Abstract: A three-story unreinforced brick building in Clinton, MO, collapsed on June 26, 2006 causing one fatality. The building was built in the 1880s. Two NIST structural engineers visited the collapse site on June 29, 2006. The NIST engineers inspected th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860671

18. Design and Construction of Structural Systems (Appendixes A-B) Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-1A)
Series: National Construction Safety Team Act Reports (NIST NCSTAR)
Report Number: 1-1
Published: 12/1/2005
Authors: Hai Sang Lew, Richard W. Bukowski, Nicholas J. Carino
Abstract: The collapse of World Trade Center (WTC) 1, 2, and 7 resulted from structural damage from direct and indirect effects of aircraft impact and the ensuing fires. Thus, for collapse analyses of these buildings, knowledge of the physical state of the str ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909013

19. Design, Construction, and Maintenance of Structural and Life Safety Systems. Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-1)
Series: National Construction Safety Team Act Reports (NIST NCSTAR)
Report Number: 1-1
Published: 12/1/2005
Authors: Hai Sang Lew, Richard W. Bukowski, Nicholas J. Carino
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=101332

20. Are Serviceability Requirements Covered Adequately in Current Codes and Standards?
Published: 10/16/2005
Author: Hai Sang Lew
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=100916



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