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A model is presented for predicting the acrosswind response of isolated square cross-section buildings to typical atmospheric boundary layers, over different terrains. Closed-form expressions for the auto-and co-spectra of the acrosswind force fluctuations are formulated, based on wind tunnel measurements. A statistical integration scheme is used to develop(More)
This paper presents spatio-temporal measurements of a #uctuating pressure "eld acting on isolated roughened cylinders of "nite height in simulated turbulent boundary layer #ows at subcritical Reynolds numbers. The cylinder surface is roughened by placing discrete roughness elements along the height at four circumferential locations. The resulting surface(More)
This paper addresses the analysis, modelling and simulation of measured full-scale wind pressure and velocity data. The records exhibit both non-Gaussian and nonstationary features, and are ideal for the application of a number of contemporary methods for handling the types of problems associated with these characteristics. Modelling the probability density(More)
The time-varying amplitude and frequency components embedded in random processes make the stationarity assumption inappropriate. Accordingly, non-stationarity of data during passage of hurricanes often precludes utilization of conventional analysis tools. In this study by invoking the Discrete Wavelet Transform (DWT) and empirical mode decomposition (EMD),(More)
The wavelet transform technique is used to detect intermittent linear and higher order correlation between pairs of correlated random signals. The statistical relevance of the resulting time dependent coherence and bicoherence are analyzed in light of the inherent noise in estimates. The presence of intermittent correlation is delineated from uncorrelated(More)
Historically, the quadratic drag term containing the square of the fluctuating velocity component has been often ignored in analyses of wind-excited structures. This paper addresses a technique to model the contribution of this term to the system response extremes. Among the topics covered are the development of a non-Gaussian gust loading factor via(More)
SUMMARY This paper discusses wind loading and associated nonlinear dynamic response of compliant offshore platforms subjected to fluctuating wind loads. Special reference is made to a tension leg platform (TLP) which is a positive-buoyant type platform moored by vertical tension members to keep the platform in location. Expressions for the wind loads are(More)
A numerical model is developed to simulate fully nonlinear transient waves in a semi-infinite, two-dimensional wave tank. A mixed Eulerian-Lagrangian formulation is adopted and a high-order boundary element method is used to solve for the fluid motion at each time step. Input wave characteristics are specified at the upstream boundary of the computational(More)
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