Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by:

Displaying 176 - 200 of 218

Computer-Based Wind Design of Low-Rise Buildings: Peak Estimation of Non-Gaussian Wind Effects

March 1, 2001

Author(s)

Fahim Sadek, Emil Simiu

This paper is a condensed version of G2001-1853, Peak Non-Gaussian Wind Effects for Database-Assisted Low-Rise Building Design, for publication in the Journal of Engineering Mechanics.Original paper abstract was:Procedures for estimating the peaks of the

Database-Assisted Estimates of Ultimate Capacities of Low-Rise Building Frames Under Wind Loads

January 1, 2001

Author(s)

S Jang, L L. Lu, Fahim H. Sadek, Emil Simiu

This paper is a derivative of G2001-1392, Database-Assisted Wind Load Capacity Estimates for Low-Rise Steel Frames, by Jang, S., et al., intended for publication in the Journal of Structural Engineering.The original paper's abstract was:A comparative study

Wind-Induced Peak Bending Moments in Low-Rise Building Frames

August 1, 2000

Author(s)

M Gioffre, Mircea Grigoriu, M Kasperski, Emil Simiu

We present a procedure for estimating peaks of non-Gaussian processes representing fluctuating internal forces induced by wind in low-rise building frames. The procedure is designed for inclusion in computer programs that use surface pressure data bases to

A Unified Theory of Deterministic and Noise-Induced Transitions: Melnikov Processes and Their Application in Engineering, Physics and Neuroscience

February 1, 2000

Author(s)

Emil Simiu

For a class of deterministic systems chaotic dynamics entails irregular transitions between motions within a potential well (librations) and motions across a potential barrier (rotations). The necessary condition for the occurrence of chaos -- and

Chaotic Resonance, Hopping Rates, Spectra and Signal-to-Noise Ratios

January 1, 2000

Author(s)

A Kovaleva, Emil Simiu

We consider a noise-free bistable system with a low frequency signal and a secondary harmonic excitation that causes the systemto experience chaotic motion with a broadband portion of the output spectrum. The signal-to-noise ratio (SNR) is defined on

Chaotic Resonnce: Hopping Rates, Spectra and Signal-to-Noise Ratios.

January 1, 2000

Author(s)

Emil Simiu, A Kovaleva

We consider a noise-free bistable system with a low frequency signal and a secondary harmonic excitation that causes the system to experience chaotic motion with a broadband portion of the output spectrum. the signal-to-noise ration (SNR) is defined on the

Discussion of Design Gust Wind Speeds in the United States by Jon A. Peterka and Sobhan Shahid, Journal of Structural Engineering Vol. 124, No. 2, February 1998, pp. 207-214

September 1, 1999

Author(s)

Emil Simiu, James J. Filliben

The discussion presents a critique of estimates of 50-year gust speeds proposed in the paper.

An Efficient Large Eddy Simulation Algorithm for Computational Wind Engineering: Application to Surface Pressure Computations on a Single Building.

August 1, 1999

Author(s)

Ronald G. Rehm, Kevin B. McGrattan, Howard R. Baum, Emil Simiu

An efficient large eddy simulation algorithm is used to compute mean surface pressure distributions on an isolated building of various rectangular shapes. Two incoming mean wind profiles are considered in these computations, one uniform with height and the

Comparison of Wind Loading Estimates Based on Extreme Speeds and Squares of Extreme Speeds

June 1, 1999

Author(s)

Emil Simiu, A N. Heckert, James J. Filliben

The hypothesis that better estimates of wind force extremes are obtained by analyzing time series of squares of wind speeds, rather than time series of wind speeds, has been considered in the engineering literature. We present results of Monte Carlo

The Fujita Tornado Intensity Scale: A Reassessment From Structural Engineering Perspective

May 1, 1999

Author(s)

Long T. Phan, Emil Simiu

This paper is a condensed version of two previous publications: NIST Technical Note 1426, by Long T. Phan and Emil Simiu; and ASCE Civil Engineering magazine article Tornado Aftermath: Questioning the Tools, by Long T. Phan and Emil Simiu.

Aerodynamic Databases and Electronic Standards for Wind Loads: A Pilot Application.

August 1, 1998

Author(s)

Emil Simiu, John Lin, T M. Whalen, D Surry

As part of ongoing National Institute of Standards and Technology research on the development of a new generation of standard provisions for wind loads, we present results of a pilot project on the use of large aerodynamic databases for the improved

Aerodynamic Databases and Electronic Standards for Windloads

August 1, 1998

Author(s)

T Whalen, Emil Simiu, G Harris, J Y. Lin, D Surry

As part of ongoing National Institute of Standards and Technology research on the development of a new generation of standard provisions for wind loads, we present results of a pilot project on the knowledge-based estimation of wind-induced bending moments

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