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CONTENTS
Volume 3, Number 1, March 2000
 

Abstract
Recently, an efficient and practical method has been developed for the generation of univariaternnon-Gaussian wind pressure time histories on low building roofs; this methodology requires intermittentrnexponential random numbers for the simulation. On the other hand, the conventional spectral representationrnscheme with random phase is found suitable for the generation of univariate Gaussian wind pressure timernhistories on low building roofs; this simulation scheme requires uniform random numbers. The dependencyrnof these simulation methodologies on the random number generator is one of the items affecting the accuracyrnof the simultion result; therefore, an attempt has been made to investigate the issue. This note presents thernobserved sensitivity of random number sets in repetitive simulations of Gaussian and non-Gaussian windrnpressures.

Key Words
Gaussian; non-Gaussian; random number; simulation; wind loads.

Address
K. Suresh Kumar, Centre for Building Studies, Concordia University, 1455, de Maisonneuve Blvd. W., Montreal, Quebec, Canada H3G 1M8

Abstract
This paper presents results of modeling of the passive contaminant diffusion from a continuousrnline finite-size source located on the underlying surface of a neutral near-ground atmospheric layerrnobtained by using the non-local two-parameteric turbulence model and the transport equation of meanrnconcentration. In the proposed diffusion model the turbulent diffusion coefficient changes not only withrnthe vertical coordinate but also with the distance downstream from the source according to thernexperimental data. The results of the modeling reproduce structural features of the concentration field.

Key Words
passive contaminant; turbulence; boundary layer.

Address
Albert F. Kurbatskii and Sergey N. Yakovenko, Institute of Theoretical and Applied Mechanics SD RAS, Physics Department, Novosibirsk State University, 630090 Novosibirsk, Russia

Abstract
In the early morning hours of February 23rd, 1998, seven large tornadoes ravaged centralrnFlorida. A total of 42 people were killed and millions of dollars of damage was done. A strip mall andrnother commercial structures sustained considerable damage and several residential areas were completelyrndestroyed. Based on field observations, the paper examines the causes and sequence of structural failurernfor the masonry single family homes. Wind speeds are estimated based on the observed damage, andrncompared to the meteorological data. Finally, recommendations are given that could help to eliminate orrnreduce similar failures in the future. It was found that with simple, cost effective measures, most if not allrnof the damage could have been prevented.

Key Words
tornadoes; masonry; damage; wind speed; mitigation; cost; Fujita scale.

Address
J.-P. Pinelli and S. O

Abstract
According to research currently developed by several authors (including the present ones) arnmultimode approach to the aeroelastic instability can be appropriate for suspension bridges with very longrnspan and so with close natural frequencies. Extending that research, this paper deals in particular with: i)rnthe role of along-wind modes, underlined also by means of the flutter mode representation; ii) the effectsrnof a variation of the mean wind speed along the span. A characterisation of the response in the timerndomain by means of an energetic approach is also discussed.

Key Words
aeroelastic instability; long-span suspension bridges; frequency-domain multimode analysis; time-domain energetic approach.

Address
Vincenzo Sepe, Dipartimento di Ingegneria Strutturale e Geotecnica - Universita di Roma \"La Sapienza\" -via Eudossiana 18 - 00184 Roma, ItalyrnLuca Caracoglia, Dipartimento di Ingegneria Civile - Universita di Trieste - p.le Europa 1 - 34127 Trieste, ItalyrnPiero D\'Asdia , Dipartimento di Scienze, Storia dell

Abstract
The cruciform shaped mast over 47 storey, Telecom Corporate Building in Melbourne, Australiarnrises to a height of approximately 25 m above the roof level. As the members are subjected to very highrnfluctuating loads under wind, the design was mainly governed by wind-induced fatigue. A detailed fatiguernanalysis was carried out according to the requirements of the Australian Steel Structures Code, AS4100.rnThe wind-induced fatigue analysis procedure is described in the paper. The fatigue design of this mast isrnused as an example to illustrate some potential problems of relevant specifications in AS4100 and tornoutline some of the more important parameters in the fatigue analysis.

Key Words
wind-induced fatigue; masts; steel; hollow sections; codes of practice.

Address
P. A. Mendis, Department of Civil and Environmental Engineering, The University of Melbourne, Victoria 3052, AustraliarnB. Dean, Connell Wagner Ltd., Victoria, Australia

Abstract
None

Key Words
PROPER ORTHOGONAL DECOMPOSITION, ROOF PRESSURE

Address
Cook NJ, 10 Arretine Close, St Albans AL3 4JL, Englandrn


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