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Author: Hai Lew

Displaying records 1 to 10 of 53 records.
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1. EXPERIMENTAL STUDY OF RC ASSEMBLIES UNDER A COLUMN REMOVAL SCENARIO
Published: 7/1/2014
Authors: Hai Sang Lew, Yihai Bao, Santiago Pujol, Mete Sozen
Abstract: This paper presents an experimental study of two full-scale reinforced concrete (R/C) beam-column assemblies under a column removal scenario. The assemblies represent portions of the exterior moment-resisting frames of two ten-story R/C frame buildin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912863

2. Robustness Assessment of RC Frame Buildings under Column Loss Scenarios
Published: 4/3/2014
Authors: Yihai Bao, Joseph A Main, Hai Sang Lew, Fahim Sadek
Abstract: A computational assessment of the robustness of reinforced concrete (RC) building structures under column loss scenarios is presented. A reduced-order modeling approach is presented for three-dimensional RC framing systems, including the floor slab, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915189

3. Robustness of Precast Concrete Frames: Experimental and Computational Studies
Published: 4/3/2014
Authors: Joseph A Main, Yihai Bao, Hai Sang Lew, Fahim Sadek
Abstract: This paper describes both full-scale testing and detailed finite-element modeling of a precast concrete moment-frame assembly extracted from the perimeter moment frame of a 10-story prototype building. The assembly comprises two beam spans and three ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915219

4. A Simple Method to Enhance Catenary Action Development in Beams of RC Frame Structures
Published: 12/1/2013
Authors: Yihai Bao, Hai Sang Lew, Fahim Sadek, Joseph A Main
Abstract: A simple debonding technique is proposed to reduce or eliminate strain localization in reinforcing bars in the region of wide flexural cracks in RC beams, and as a result enhance the resistance of RC buildings to disproportionate collapse. In this st ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914051

5. Alkali-Silica Reaction Degradation of Nuclear Power Plant Concrete Structures: A Scoping Study
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7937
Published: 3/11/2013
Authors: Kenneth Alan Snyder, Hai Sang Lew
Abstract: Alkali-silica reaction (ASR) is a concrete degradation phenomenon in which the alkalis that are typically found in concrete react with certain amorphous or micro-crystalline siliceous phases in the aggregate and, in the presence of moisture, form ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913633

6. Modeling of Reinforced Concrete Assemblies under a Column Removal Scenario
Published: 11/8/2012
Authors: Yihai Bao, Hai Sang Lew, Sashi K. Kunnath
Abstract: This paper presents a computational investigation of two reinforced concrete beam-column assemblies, each comprising three columns and two beams, subjected to monotonically increasing vertical displacement of the unsupported center column simulating ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910525

7. Performance of Steel Moment Connections under a Column Removal Scenario. I: Experiments
Published: 4/3/2012
Authors: Hai Sang Lew, Joseph A Main, Stephen D Robert, Fahim Sadek, Vincent Chiarito
Abstract: This paper presents an experimental study of two full-scale steel beam-column assemblies, each comprising three columns and two beams, to (1) define their response characteristics under a column removal scenario, including the capacity of the beams a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909210

8. Performance of Steel Moment Connections under a Column Removal Scenario. II: Analysis
Published: 4/3/2012
Authors: Fahim Sadek, Joseph A Main, Hai Sang Lew, Sherif El-Tawil
Abstract: This paper presents a computational investigation of the response of steel beam-column assemblies with moment connections under monotonic loading conditions simulating a column removal scenario. Two beam-column assemblies are analyzed, which incorpo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909213

9. Computational Model for Nonlinear Behavior of R/C Beam-Column Assemblies and Full-Scale Experimental Validation under a Column Removal Scenario
Published: 10/31/2011
Authors: Yihai Bao, Hai Sang Lew
Abstract: A number of computational tools have been developed in recent years to simulate the disproportionate (progressive) collapse behavior of multi-story reinforced concrete buildings. Under disproportionate collapse scenarios, beam-column connections of m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909260

10. Modeling and Analysis of Disproportionate Collapse of RC Structures
Published: 10/31/2011
Authors: Yihai Bao, Hai Sang Lew, S K. Kunnath
Abstract: Collapse analyses of a 10-story reinforced concrete frame building are carried out to investigate the robustness of structural systems against column removal scenarios. Computationally efficient reduced models are developed and used in the analyses. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909265



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