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Performance of precast concrete moment frames subject to column removal: II. Computational Analysis

September 1, 2020

Author(s)

Yihai Bao, Joseph Main, Hai S. Lew, Fahim Sadek

This paper presents a computational study of two precast concrete moment-frame assemblies, each comprising three columns and two beams, subjected to displacement-controlled vertical loading of the unsupported center column to simulate a column removal

Numerical simulation of wind-induced mean and peak pressures around a low-rise structure

August 1, 2020

Author(s)

DongHun Yeo, Robert H. Ong, Luca Patruno, Yaping He, Kenny C. Kwok

We performed Computational Fluid Dynamics (CFD) analysis of the low-rise buildings immersed in a turbulent boundary layer. The Silsoe 6 m cube was chosen as the main case study in representing the key features of the typical wind conditions experienced by

Modern reassessment of the Citicorp Building design wind loads

June 15, 2020

Author(s)

Dat Duthinh

Following structural engineering practice of the 1970s, engineers designed the Citicorp Building for the action of wind in each of the structures principal axes. One problem they faced was how to determine design values by combining simultaneous wind

Experimental investigation of structural steel beams subjected to localized fire

May 29, 2020

Author(s)

Selvarajah Ramesh, Lisa Y. Choe, Chao Zhang

This paper presents an experimental behavior of unprotected W16 × 26 steel beams subjected to localized fire. Beam specimens were either simply supported or connected to steel columns via all bolted double angle connections. Two test fires, steady or

A Summary of Industrial Verification, Validation, and Uncertainty Quantification Procedures in Computational Fluid Dynamics

March 24, 2020

Author(s)

DongHun Yeo

Within a variety of CFD applications, their maturity levels can be significantly varied, depending upon e.g., modeling approach and progress of application skills. Recently, CWE (Computational Wind Engineering) has been developed with great attentions from

Reduced-order Modeling of Composite Floor Slabs in Fire. II: Thermal-Structural analysis

March 19, 2020

Author(s)

Jian Jiang, Joseph Main, Jonathan Weigand, Fahim H. Sadek

This paper describes a reduced-order modeling approach for the thermal and structural analysis of fire effects on composite slabs with profiled steel decking. The reduced-order modeling approach, which uses alternating strips of layered shell elements to

Lab Test Confidential: Seismic Loading Protocols

March 3, 2020

Author(s)

Matthew S. Speicher, Bruce Maison

Collapse Risk of Steel Special Moment Frames per FEMA P695

February 5, 2020

Author(s)

Matthew S. Speicher, Jazalyn D. Dukes, Kevin K. Wong

The American Society of Civil Engineers (ASCE) performance-based seismic design standard, ASCE 41, contains methodologies used by practicing engineers to assess existing buildings and to design new buildings. In 2015, the National Institute of Standards

EFFECTS OF ALKALI-SILICA REACTION ON MECHANICAL PROPERTIES AND STRUCTURAL CAPACITIES OF REINFORCED CONCRETE STRUCTURES

January 31, 2020

Author(s)

Long T. Phan, Fahim Sadek, Travis E. Thonstad, Hai S. Lew, Sorin Marcu, Jacob Philip

This paper describes an ongoing, comprehensive research program being conducted at the National Institute of Standards and Technology (NIST) under the sponsorship of the U.S. Nuclear Regulatory Commission (NRC). The study aims to develop technical basis

Database-Assisted Design of Purlins and Girts for Wind Accounting for Directionality

January 8, 2020

Author(s)

Dat Duthinh, Emil Simiu

For the database-assisted design (DAD) of low-rise building purlins and girts, a method is proposed that explicitly accounts for wind directionality by using directional wind tunnel measurements, directional wind speed data, and publicly available software

Discussion of: Fragility Curves for Wide-Flange Steel Columns and Implications for Building-Specific Earthquake-Induced Loss Assessment

August 1, 2019

Author(s)

Bruce F. Maison, Matthew Speicher

The Blind Side: Using Canned Loading Protocols in Seismic Testing

June 17, 2019

Author(s)

Matthew S. Speicher, Bruce F. Maison

The seismic behavior of a building component (e.g., shear wall) is a fundamental attribute engineers need to assess the earthquake performance of a building. It is no surprise that component behavior is often dependent on the loading history. Repeatedly

Long-Slotted Plate Connections for Enhancing the Robustness of Steel Gravity Systems against Column Loss: Preliminary Results

April 27, 2019

Author(s)

Jonathan M. Weigand, Travis E. Thonstad, Andrew Seamone

Steel gravity frames are commonly used in United States building construction practice, but they are potentially vulnerable to disproportionate collapse under column loss, as has been shown by recent experimental and analytical studies. To overcome these

EQUIVALENT STATIC WIND LOADS VS. DATABASE-ASSISTED DESIGN OF TALL BUILDINGS: AN ASSESSMENT

April 1, 2019

Author(s)

Sejun Park, Emil Simiu, DongHun Yeo

Recent developments in pressure measurement technology, and unprecedented big data capabilities, have enabled the development of Database-assisted Design (DAD), a powerful innovative approach to the design of tall buildings for wind. DAD is accurate

WIND EFFECTS ON A TALL BUILDING WITH SQUARE CROSS SECTION AND MID-SIDE BASE COLUMNS: A DATABASE- ASSISTED DESIGN APPROACH

March 6, 2019

Author(s)

Sejun Park, Dat Duthinh, Emil Simiu, DongHun Yeo

This paper illustrates the application of the Database-Assisted Design (DAD) method to the wind design of high-rise buildings. The paper uses publicly available wind tunnel data and DAD procedures to compare responses to (i) corner winds and (ii) face

Citicorp Building repairs revisited: answers to a fateful question asked by an undergraduate student forty years ago

December 3, 2018

Author(s)

Dat Duthinh

Function VoronoiBound

November 30, 2018

Author(s)

Dat Duthinh, Brian M. Phillips

Matlab Function VoronoiBound calculates a Voronoi diagram with inner and outer bounds. This function is useful in defining tributary areas of pressure taps regularly or irregularly placed on the outside surface of a wind tunnel model.

The Lumberton, North Carolina Flood of 2016: A Community Resilience Focused Technical Investigation

October 29, 2018

Author(s)

John W. van de Lindt, Walter G. Peacock, Judith Mitrani-Reiser, Nathanael Rosenheim, Derya Deniz, Maria Dillard, Tori Tomiczek, Maria Koliou, Andrew Graettinger, Patrick Crawford, Kenneth W. Harrison, Andre Barbosa, Jennifer Tobin, Jennifer Helgeson, Lori Peek, Mehrdad Memari, Elaina Sutley, Sara Hamideh, Donghwan Gu, Stephen A. Cauffman, Juan Fung

In early October 2016 Hurricane Matthew crossed North Caroline as a category 1 storm with some areas receiving 15-18 inches of rainfall on already saturated soil. The NIST-funded Center for Risk-Based Community Resilience Planning teamed with researchers

Shear Behavior of High-strength Bolts at Elevated Temperatures: Testing and Formulation of Reduced-order Model

September 21, 2018

Author(s)

Mina S. Seif, Rafaela Peixoto, Jonathan M. Weigand, Joseph A. Main, Luiz Vieira

Influence of wind tunnel test duration on wind load factors

August 17, 2018

Author(s)

Dat Duthinh, Adam L. Pintar, Emil Simiu

A methodology is presented for calculating the uncertainty associated with the estimation of peak pressure coefficients from wind tunnel test records of various lengths, and how this uncertainty affects design wind effects. Investigation of time series

Database-Assisted Design and Equivalent Static Wind Loads for Mid- and High-Rise Structures: Concepts, Software, and Users Manual

June 28, 2018

Author(s)

Sejun Park, Donghun Yeo, Emil Simiu

This report presents the software DAD_ESWL v1.0 capable of computing efficiently the response to wind of mid- and high-rise structures consisting of up to thousands of members. The report also documents the following features of the software: (1) Use of

Introductory Tutorial for DAD: Design Examples of High-Rise Building for Wind

June 28, 2018

Author(s)

Sejun Park, Donghun Yeo

This report presents the introductory tutorials for the use of the software DAD_ESWL v1.0 capable of computing efficiently the response to wind of mid- and high-rise structures consisting of up to thousands of members.

Flexural Compression Capacity of Thin Reinforced Concrete Structural Walls

June 25, 2018

Author(s)

Christopher L. Segura, Carlos Arteta, John Wallace

Stability of slender reinforced concrete walls has become an issue of interest for researchers since observations of their performance in recent earthquakes indicated that code compliant walls may be vulnerable to brittle compression failure and rebar

Importance of Experimental Loading Protocols in Developing ASCE 41-17 Backbone Curves

June 25, 2018

Author(s)

Bruce F. Maison, Matthew Speicher

ASCE 41 component backbone curves are typically based on envelopes of data from lab tests of specimens subjected to simulated seismic demands. Prior editions of ASCE 41 required loading protocols having fully-reversed cyclic loading at increasing

Using FEMA P695 to Interpret ASCE 41 Seismic Performance of Special Moment Frames

June 25, 2018

Author(s)

Matthew S. Speicher, Jazalyn D. Dukes, Kevin K. Wong

ASCE 41 contains methodologies used by practicing engineers for the assessment of existing buildings and the design of new buildings. The National Institute of Standards and Technology recently completed a study investigating the relationship between ASCE