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Buildings & Construction

Structural engineering

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Displaying 101 - 125 of 155

STEEL GRAVITY CONNECTIONS SUBJECTED TO LARGE ROTATIONS AND AXIAL LOADS

October 13, 2016
Author(s)
Jonathan M. Weigand, Jeffrey W. Berman
Steel gravity framing systems (SGFSs) rely on connections for system robustness when a column suffers damage that compromises its ability to carry gravity loads. Redistribution of gravity loads through the development of a sustained tensile configuration

Enhanced connections for improved robustness of steel gravity frames

October 12, 2016
Author(s)
Jonathan Weigand, Joseph Main
Potential vulnerabilities to collapse have been identified for steel gravity framing systems with conventional gravity connections subjected to column loss. To address these potential vulnerabilities, a high-fidelity finite element modeling approach is

Guide Brief 1 - Characterize the Population

September 30, 2016
Author(s)
Community Resilience Program NIST
This Guide Brief provides additional rationale and guidance regarding the first part of Step 2 in the Guide, “Characterize social functions and dependencies” which starts with “Characterize the population.” The intended audience is the social dimensions

Guide Brief 2 - Identify Social Institutions

September 30, 2016
Author(s)
Community Resilience Program NIST
This Guide Brief provides additional rationale and guidance regarding Step 2 in the Guide—“Understand the Situation” —for how to “Identify Social Institutions”. The primary intended audience is the social dimensions work group of the collaborative planning

Guide Brief 4 - Determining Anticipated Performance

September 30, 2016
Author(s)
Community Resilience Program NIST
This Guide Brief provides guidance for determining the anticipated performance of building clusters and infrastructure systems when subjected to hazard events. This information is needed to complete the performance goals tables, establish existing system

Guide Brief 4A: Example for Determining Anticipated Performance

September 30, 2016
Author(s)
Community Resilience Program NIST
This Guide Brief provides an example of how to determine the anticipated performance of water and wastewater systems subjected to an earthquake and tsunami event. The methodology used for this can be applied to all infrastructure systems. The example

A SIMPLE METHOD OF ENHANCING THE ROBUSTNESS OF R/C FRAME STRUCTURES

June 1, 2016
Author(s)
Yihai Bao, Hai S. Lew, Fahim Sadek, Joseph A. Main
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 to enhance the resistance of RC buildings to disproportionate collapse (also referred to as

Integrity of Bolted Angle Connections Subjected to Simulated Column Removal

December 8, 2015
Author(s)
Jonathan M. Weigand, Jeffrey W. Berman
Large-scale tests of steel gravity framing systems (SGFSs), one of the most commonly used structural systems in the United States, have shown that enhancements may be required to achieve the desired levels of integrity to collapse when a column suffers

Analysis of a Half-Scale Composite Floor System Test under Column Loss Scenarios

April 23, 2015
Author(s)
Joseph A. Main, Jonathan M. Weigand, Eric S. Johnson, Tim Francicso, Judy Liu, Jeffrey W. Berman, Larry A. Fahnestock
This paper describes modeling and analysis of a half-scale steel gravity frame system with composite concrete slab on steel deck that was constructed and tested at the University of Illinois under corner, edge, and interior column removal scenarios. For

New Steel Gravity Connection Details for Enhanced Integrity

April 23, 2015
Author(s)
Jonathan M. Weigand, Jeffrey W. Berman
Recent large-scale tests have found that Steel Gravity Framing Systems (SGFSs) with conventional connections were inadequate to support the integrity gravity load combinations under column removal scenarios. To address this issue, detailed connection

EXPERIMENTAL STUDY OF RC ASSEMBLIES UNDER A COLUMN REMOVAL SCENARIO

July 1, 2014
Author(s)
Hai S. Lew, Yihai Bao, Santiago Pujol, Mete Sozen
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 buildings

Robustness Assessment of RC Frame Buildings under Column Loss Scenarios

April 3, 2014
Author(s)
Yihai Bao, Joseph A. Main, Hai S. Lew, Fahim Sadek
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, and

Robustness of Precast Concrete Frames: Experimental and Computational Studies

April 3, 2014
Author(s)
Joseph A. Main, Yihai Bao, Hai S. Lew, Fahim Sadek
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

A Simple Means for Reducing the Risk of Progressive Collapse

December 1, 2013
Author(s)
Yihai Bao, Hai S. Lew, Fahim H. Sadek, Joseph Main
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 study

Structural Design for Disaster Resilience

October 28, 2013
Author(s)
Fahim H. Sadek, Joseph Main, John L. Gross, Therese P. McAllister
This paper presents a brief overview of research at the National Institute of Standards and Technology (NIST) on disaster resilience of buildings, infrastructure, and communities, including component programs and projects. NIST's efforts aim at developing

Fatigue Crack Growth Modeling of Pipeline Steels in High Pressure Gaseous Hydrogen

October 21, 2013
Author(s)
Robert L. Amaro, Elizabeth S. Drexler, Andrew J. Slifka
Hydrogen will likely play a key role in a future clean energy economy. However, fundamental understanding of the deleterious effects of hydrogen on the fatigue and fracture properties of pipeline steels is lacking. Furthermore, engineering tools for design

Modeling and Analysis of Single-Plate Shear Connections Under Column Loss

May 8, 2013
Author(s)
Joseph A. Main, Fahim Sadek
This paper presents a computational assessment of the behavior of single-plate shear (“shear tab”) connections in gravity frames under column loss scenarios. Two-span beam assemblies are considered under pushdown loading of the unsupported center column
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