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DEVELOPMENT OF LARGE DIRECTIONAL WIND SPEED DATABASES

April 25, 2011

Author(s)

Dong Hun Yeo

For structures sensitive to wind directionality, methods for the estimation of wind effects require the use of time series of directional wind speeds with length exceeding the length of the MRIs of interest. This study proposes a procedure for generating

Technical Basis for Regulatory Guidance on Design-Basis Hurricane-Borne Missile Speeds for Nuclear Power Plants

March 16, 2011

Author(s)

Emil Simiu, Florian A. Potra

This report provides the technical basis for a potential new regulatory guide that would provide licensees and applicants with guidance that the staff of the U.S. Nuclear Regulatory Commission (NRC) considers acceptable for use in selecting the design

Computational Study on Aerodynamic Mitigation of Wind-Induced, Large-Amplitude Vibrations of Stay Cables With Strakes

March 1, 2011

Author(s)

Dong Hun Yeo, Nicholas P. Jones

Modifications of circular cylinder surfaces, such as strakes and helical wires, effectively mitigate Kármán vortex-induced vibrations normal to flow and have been applied to the reduction of large-amplitude vibrations of stay cables in bridges, which occur

Thunderstorm characteristics of importance in wind engineering Part I: Temporal scales and turbulence

February 23, 2011

Author(s)

Franklin T. Lombardo, Douglas Smith, John Schroeder, Kishor Mehta

The idea that wind is wind allows statistics for wind and pressure collected in wind tunnels to be used in wind load standards. Statistics collected in wind tunnels are based on inherently stationary data and verified with field data that is stationary in

Thunderstorm characteristics of importance to wind engineering Part II: Profiles, gust factors and other observations

February 23, 2011

Author(s)

Franklin T. Lombardo, Douglas Smith, John Schroeder, Kishor Mehta

A PROPOSED TECHNIQUE FOR DETERMINING AERODYNAMIC PRESSURES ON RESIDENTIAL HOMES

February 16, 2011

Author(s)

Tuan-Chun Fu, Aly Mousaad Aly, Arindam Chowdhury, Girma Bitsuamlak, DongHun Yeo, Emil Simiu

Wind loads on low-rise buildings in general and residential homes in particular can differ significantly depending upon the laboratory in which they were measured. The differences are due in large part to inadequate simulations of the low-frequency content

Characterization of Flow Oblique to a Circular Cylinder with Low Aspect Ratio Using 3-D Detached Eddy Simulation

January 31, 2011

Author(s)

Dong Hun Yeo, Nicholas P. Jones

Large-amplitude vibrations of stay cables in cable-stayed bridges can threaten the safety and serviceability of the structures. Understanding of the excitation mechanism is necessary to mitigate such vibrations effectively and efficiently. Experimental

Numerical Simulation of Along-Wind Loading on Small Structures Using a Simplified Wind Flow Model

November 10, 2010

Author(s)

Dong Hun Yeo

Aerodynamic measurements of wind-induced pressures on structures are required for the codifi-cation of design wind loads. However, the reliable measurement of pressures on low-rise build-ings in the atmospheric boundary layer (ABL) flow remains a challenge

Database-Assisted Design for Wind: Veering Effects on High-Rise Structures

August 15, 2010

Author(s)

Dong Hun Yeo, Emil Simiu

Atmospheric boundary layer winds experience two types of effects due to friction at the ground surface. One effect is the increase of the wind speeds with height above the surface. The second effect, called the Ekman layer effect, entails veering -- the

Database-Assisted Design for Wind: Concepts, Software, and Example for High-Rise Reinforced Concrete Structures

July 23, 2010

Author(s)

Dong Hun Yeo

Time-domain analyses of wind effects on high-rise structures have been made possible in recent years by advances in wind pressure measurement and computer technology. Time domain solutions not only provide full phase information on structural responses to

Wind and Structural Engineering: Ensuring an Effective and Transparent Division of Responsibilities

June 30, 2010

Author(s)

Emil Simiu, Dong Hun Yeo

To help assure safe performance under loads that may occur during a structure s life, structural design practices are regulated by code provisions, and the design of the structure must be approved by a qualified public official. For the design and approval

Aerodynamic Effects of Strake Patterns on Flow around a Yawed Circular Cylinder

May 24, 2010

Author(s)

Dong Hun Yeo, Nicholas P. Jones

Strakes on a circular cylinder are often used for mitigation of cylinder vibrations and have been applied to reduction of large-amplitude vibrations of a stay cable in cable-stayed bridges, which occur under wind oblique to a cable with or without rainfall

Database-Assisted Design for Wind Effects on High-Rise Structures and Its Potential for Assessment of CFD Simulation

May 24, 2010

Author(s)

Dong Hun Yeo, Emil Simiu

Efforts are being made to perform CFD-based estimates of wind effects on tall buildings that are sufficiently reliable to allow their use in lieu of estimates based on wind tunnel measurements. For practical purposes the assessment of the quality of the

Introduction of Wave Set-up Effects and Mass Flux to the Sea, Lake, and Overland Surges from Hurricanes (SLOSH) Model

May 12, 2010

Author(s)

Long T. Phan, Donald Slinn, Shaun Kline

Hurricanes wreak havoc on the lives and infrastructure of coastal communities. Storm surge, a local rise in sea level elevations, is perhaps the most devastating element of these tropical cyclones. Storm surge depends on the tidal stage, barometric

High-Rise Database-Assisted Design 1.1 (HR_DAD_1.1): Concepts, Software, and Examples

February 2, 2009

Author(s)

Seymour M. Spence

This report documents the changes that have been made to the previous structure of the HR_DAD software, thereby developing the program HR_DAD_1.1 capable of calculating efficiently the response of large scale real world tall buildings made up of many

Assessment of ASCE 7 Standard Wind Load Factors for Tall Building Response Estimates

May 1, 2008

Author(s)

Rene D. Gabbai, William P. Fritz, Amelia P. Wright, Emil Simiu

Wind load factors incorporated in the ASCE 7 Standard are based on rough approximations of wind effects and the uncertainties inherent in them. These factors are routinely applied to tall building design, even though the original calculations on which they

Performance of Physical Structures in Hurricane Katrina and Hurricane Rita: A Reconnaissance Report (NIST TN 1476)

June 30, 2006

Author(s)

Stephen A. Cauffman, Long T. Phan, Fahim Sadek, William P. Fritz, Dat Duthinh, Walter J. Rossiter Jr

This is the final report on the National Institute of Standards and Technology (NIST) led-reconnaissance to assess the performance of physical structures during Hurricane Katrina and Hurricane Rita. The report describes the environmental conditions (wind

Fujita Tornado Intensity Scale: A Critique Based on Observations of the Jarrell Tornado of May 27, 1997 (NIST TN 1426)

July 1, 1998

Author(s)

Long T. Phan, Emil Simiu

On May 27, 1997, several tornadoes hit the Central Texas area in the counties of McLennan, Bell, Williamson, and Travis. The most destructive of these tornadoes swept through a housing area on the outskirts of Jarrell, Texas. Jarrell is a Central Texas

ASSESSMENT OF A METHOD FOR ESTIMATING PEAKS OF STATIONARY RANDOM PROCESSES BY USING EXTREME VALUE TYPE I DISTRIBUTIONS

Author(s)

Dat Duthinh, Dong Hun Yeo, Emil Simiu

The purpose of this note is to assess a method based on the Extreme Value Type I distribution currently employed in wind engineering practice to estimate stationary time series peaks. The note considers the interesting case of time series with Gaussian