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Han Y.C.,Fluor
Proceedings, Annual Conference - Canadian Society for Civil Engineering | Year: 2011

A practical analysis is described for dynamic soil-structure interaction using a substructure approach. The nonlinearity of soil is approximated using a boundary zone model with non-reflective interface, and computer programs are available for practical applications. The validation of the model is confirmed with dynamic tests on piles in the field, and the results for a single pile are used to compare with the predictions in this study. The liquefaction for a sand soil layer can be accounted for, and a case of liquefaction is discussed. Two practical examples are examined, a vacuum tower structure supported on foundation of steel pile group and a table top structure supported on foundation of concrete pile group. To illustrate the effects of soil-pile-structure interaction on the seismic response of vacuum structure, different base conditions are considered, rigid base, i.e. no deformation of the foundation; linear soil-pile system; and nonlinear soil-pile system. The method introduced can be applied to the design of tall buildings, bridges, industrial structures and offshore platforms with soil-pile-structure interaction under seismic or dynamic loads. Source


Han Y.,Fluor
Proceedings, Annual Conference - Canadian Society for Civil Engineering | Year: 2015

The dynamic analysis of grinding mill foundation is a typical problem of soil-structure interaction. The sub-structure method is used to carry out the dynamic analysis and design in practice. The concrete mat foundation and piers are modelled by FEM, and the stiffness and damping of soil (rock) are generated by a computer program. Then the impedance parameters are input into to the FEM model as the base boundary condition. Radiation damping is the dominant energy dissipation mechanism in most dynamically loaded foundation systems, and the values of radiation damping have been modified in the program based on dynamic tests. In this study a practical case of grinding mill foundation is investigated to illustrate the approach and the dynamic behaviour of structure. The rock is weathered in the site and capacity is not high enough to provide strong stiffness of supporting piers. The weakened rock is a challenge to the design of grinding mill foundation in this case. Different design options are compared to obtain the better solution, that is, the vibrating amplitudes calculated should be less than the allowable vibrating limit, and the construction cost should be reduced. © Copyright (2015) by the Canadian Society for Civil Engineering. All rights reserved. Source


Solar Photovoltaic (PV) power plants have high performance test measurement uncertainty due to instrument precision limitations and spatial variations associated with irradiance and soiling measurement. Accurate prediction of the measurement uncertainty is critical for both the Owner and the EPC contractor to appropriately manage their risk. While there are several methods for testing the performance of PV plants, regression analysis based methods, like the PVUSA Method and the PPI rating method, are widely used. However, there is limited guidance on uncertainty analysis when using these methods. Most utilities and power producers have familiarity with the ASME PTC 19.1 code for measurement uncertainty analysis and often require the guidelines of PTC 19.1 be followed for evaluating the measurement uncertainty for the performance testing of PV plants. However there is lack of published literature on using the ASME PTC 19.1 approach with regression based PV performance test methods. This paper expands on the limited guidance provided by ASME PTC 19.1 Section 8-6 for regression based analysis and presents a detailed approach of calculating measurement uncertainty for PV power plants when using regression based testing methods. The paper also presents the importance of obtaining a good regression fit to the measurement uncertainty and elaborates on methods to reduce the measurement uncertainty. The overall approach discussed in this paper was applied on performance testing of two large utility-scale PV plants. © 2015 by ASME. Source


Urdaneta Perez R.Y.,Fluor | Lenferink J.E.O.,Flour
Hydrocarbon Processing | Year: 2015

A commercial simulation tool is used to carry out the analysis of the transient phenomena caused by the tube rupture event during the design phase of an HP heat exchanger. Guidance is provided on how to carry out this type of dynamic study. © 2015 Hydrocarbon Processing. Source


Kister H.Z.,Fluor
Chemical Engineering Progress | Year: 2013

Quantitative, multichordal gamma-scan analysis is invaluable for diagnosing maldistribution and channeling in distillation columns. Quantitative gamma-scan analysis. It is easy to obtain scans of the empty column, which provide an invaluable reference point. In addition, the small column diameters minimize radiation scatter, and allow radioactive sources that reduce measurement noise to be used. Harrison's technique is the foundation for the practice of quantitative analysis of commercially gamma scans. He also developed a highly reliable method for determining froth height from commercial gamma scans. The vertical line on the scan determines the amount of radiation transmitted through a liquid-free, obstruction-free vapor space region near the relevant tray section. Froth heights below the tray spacing indicate nonflooded trays. Froth heights equal to or exceeding the tray spacing indicate flooding. Source

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