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Displaying 151 - 175 of 218

Meteorological Extremes

July 1, 2002

Author(s)

Emil Simiu

This entry discusses briefly basic principles of extreme value (EV) estimation (see Extreme value analysis), the role of simulations for the development of relevant meteorological data sets, the interaction between the practical application of the

Data-Assisted Design for Wind Loading

June 1, 2002

Author(s)

Emil Simiu, Fahim Sadek, T Whalen, S Jang, L L. Lu, S M. Diniz, A Grazini, Michael A. Riley

Current ASCE Standard provisions on wind loads for low-rise building design are based on wind tunnel tests conducted at the University of Western Ontario in the 1970's. In spite of the advances they entailed at the time, those provisions are inadequate

Fragility Curves, Damage Matrices, and Wind-Induced Loss Estimation

June 1, 2002

Author(s)

James J. Filliben, K Gurley, J P. Pinelli, Emil Simiu, M Subramanian

This note presents a conceptual framework for the definition of basic damage states and of the corresponding fragility curves and conditional probabilities, and its use for the estimation of damage matrices. The framework is designed with two

Structural Reliability Estimates and Database-Assisted Design for Wind

June 1, 2002

Author(s)

F Minciarelli, Fahim H. Sadek, Emil Simiu, Mircea Grigoriu

We propose a probabilistic methodology for developing improved estimates of extreme wind effects and load factors in standard provisions for wind loads. We obtained the following results: (1) the discrepancy between current estimates of safety indices for

Peak Non-Gaussian Wind Effects for Data Base-Assisted Low-Rise Building Design

May 1, 2002

Author(s)

Fahim Sadek, Emil Simiu

Current procedures for estimating the peaks of the stochastic response of tall buildings to wind are based on the assumption that the response is Gaussian. Those procedures are therefore inapplicable to low-rise buildings, in which time histories of wind

Manual for Seismic and Windstorm Evaluation of Existing Concrete Buildings for Dominican Republic (NIST IR 6867)

April 1, 2002

Author(s)

Hai S. Lew, Emil Simiu, John L. Gross

This manual is prepared for seismic and winds hazards evaluation of reinforced concrete buildings in the Dominican Republic. The evaluation procedures presented in this manual can be applied to any ordinary cast-in-place concrete buildings, but are

Taming Chaotic Dynamics With Weak Periodic Perturbations: An Elucidation and Critique

April 1, 2002

Author(s)

Z Abbadi, Emil Simiu

It has been pointed out that a chaos control technique wherein a weak excitation is added to the system could be useful for the control of friction at the nanoscale. We examine the claim that this technique can achieve chaos control even though the added

Discussion of Classical Extreme Value Model and Prediction of Extreme Winds by Janos Galambos and Nicholas Macri

February 1, 2002

Author(s)

Emil Simiu, J Lechner

The paper is a discussion of the paper with the above title by J. Galambos and N. Macri published in the July 1999 issue of the Journal of Structural Engineering

Estimates of Extreme Wind Effects and Wind Load Factors: Influence of Knowledge Uncertainties

October 1, 2001

Author(s)

F Minciarelli, M Gioffre, Mircea Grigoriu, Emil Simiu

We propose a probabilistic methodology for developing improved load factors in standard provisions for wind loads, and use it to examine: the cause of the discrepancy noted in the 1980s between estimates of safety indices for wind and gravity loads; the

Database-Assisted Design, Standardization, and Wind Direction Effects - Closure

August 1, 2001

Author(s)

A Rigato, P Chang, Emil Simiu

The writers present a simple methodology, developed for use in design assisted by electronic acrodynamic and climatological databases (for short, database-assisted design), that allows a realistic assessment of wind directionality effects. The methodology

Extreme Wind Load Estimates Based on the Gumbel Distribution of Dynamic Pressures: An Assessment

July 1, 2001

Author(s)

Emil Simiu, A N. Heckert, James J. Filliben, Steven K. Johnson

We present a contribution to the current debate on whether it is more appropriate to fit a Gumbel distribution to the time series of the extreme dynamic pressures (i.e. of the squares of the extreme wind speeds) than to fit an extreme value distribution to

Ultimate Capacities of Low-Rise Steel Frames in Turbulent Wind

July 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

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