Browsing by Subject "Texas Tech University. -- Wind Engineering Research"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item The effects of stationarity on the pressure coefficients measured on a low-rise building(Texas Tech University, 2002-08) Whitworth, Mona RichardThe primary objective of this investigation is to establish whether or not nonstationarity has a significant effect on the pressures (and the resulting pressure coefficients) measured on the full-scale building at WERFL. Four flow regimes (stagnation, wake, separated and conical vortex) using three pressure taps located on the wall, the roof edge, and the roof comer were chosen for this investigation. Summary statistics from 15-minute duration runs collected in collection Modes 15, 28, 38, 48, 49, 50, 51, and 52 over a period of 10 years are used in this study. Four categories of stationarity were used for the analysis. Stationary Speed & Stationary Direction (SS), Nonstationary Speed and Stationary Direction (NS), Stationary Speed & Nonstationary Direction (SN), Nonstationary Speed and Nonstationary Direction (NN). The Kruskal-Wallis test on the Cp mean, rms, min and max pressure coefficients using the 4 stationarity categories were initially performed to establish a statistical significant difference in the Cp's associated with each of the stationarity categories. The Kruskal-Wallis test does not remove the effects of flow characteristics on the measured pressure coefficients. To remove the confounding effects of the flow turbulence parameters, the non parametric Friedman Test was used. Roughness length, zo, longitudinal turbulence Intensity lu, lateral turbulence Intensity L, and mean wind speed are used as blocking factors in the Friedman test. In general, stationarity of speed and direction was not significant when the effects of the flow characteristics are considered.Item Wind effects on a full-scale frame(Texas Tech University, 2002-12) Jain, ShikhaThe design of structural members entails computation of members' stresses generated due to various loads such as dead load, live load, wind load, earthquake load etc. This study restricts itself to the determination of load effects arising out of wind load. The subject of this research is the building located in the WERFL field site, Texas Tech University, Lubbock. The building is comprised of three portal frames. The focus is on determining load effects at three locations for the middle frame of the building Influence coefficients are obtained for various tap locations on the building. The pressure coefficients obtained from model scale testing of WERFL at UWO boundary layer wind tunnel are combined with the influence coefficients to obtain the desired load effects. This has been enabled through MATLAB programs developed for this research. The marginal relative frequency distribution for these load effects is compared to Gaussian and Gamma distributions to understand the applicability of these distributions in generalizing the wind tunnel results. Load effects are computed for this building using ASCE 7 recommended pressure coefficients. These values have been compared with wind tunnel load effects. The magnitude of load effect obtained using ASCE 7-98 pressure coefficient values is higher than the mean value obtained using wind tunnel data for all load effects except for uplift in leeward column and is observed to lie in the tail region of the marginal distribution of load effect generated using wind tunnel data.