The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform

Zeng Zhen Qian - One of the best experts on this subject based on the ideXlab platform.

  • Development on Environmental Geotechnology for Overhead Transmission Line Foundation Engineering in China
    Advanced Materials Research, 2012
    Co-Authors: Xian Long Lu, Zeng Zhen Qian
    Abstract:

    This paper presents the concept and the fundamental issues and the development on the environmental geotechnology in transmission lines Foundation Engineering. Namely, environmental geotechnology and theory is to study the restriction effects of environment on the transmission line routes, Foundation selection and reliability, to predict the results of transmission line Foundation construction on the environment, and to study on countermeasures of environmental protection in transmission Foundation Engineering. And then, from the above three aspects, the design method combined strength and displacement for tower Foundation, the selection on Foundation types and technical scheme for transmission line tower, and the countermeasures for soil and water conservation, the author introduces the development and practice of environmental geotechnology for transmission lines Foundation Engineering in China.

Qian Zengzhen - One of the best experts on this subject based on the ideXlab platform.

Chin Loong Chan - One of the best experts on this subject based on the ideXlab platform.

  • practical second order reliability analysis applied to Foundation Engineering
    International Journal for Numerical and Analytical Methods in Geomechanics, 2012
    Co-Authors: Chin Loong Chan, B K Low
    Abstract:

    SUMMARY A practical and efficient approach of implementing second-order reliability method (SORM) is presented and illustrated for cases related to Foundation Engineering involving explicit and implicit limit state functions. The proposed SORM procedure is based on an approximating paraboloid fitted to the limit state surface in the neighborhood of the design point and can be easily carried out in a spreadsheet. Complex mathematical operations are relegated to relatively simple user-created functions. The failure probability is calculated automatically based on the reliability index and principal curvatures of the limit state surface using established closed-form SORM formulas. Four common Foundation Engineering examples are analyzed using the proposed method and discussed: immediate settlement of a flexible rectangular Foundation, bearing capacity of a shallow footing, axial capacity of a vertical single pile, and deflection of a pile under lateral load. Comparisons with Monte Carlo simulations are made. In the case of the laterally loaded pile, the friction angle of the soil is represented as a one-dimensional random field, and pile deflections are computed based on finite element analysis on a stand-alone computer package. The implicit limit state function is approximated via the response surface method using two quadratic models. Copyright © 2011 John Wiley & Sons, Ltd.

  • Practical second‐order reliability analysis applied to Foundation Engineering
    International Journal for Numerical and Analytical Methods in Geomechanics, 2011
    Co-Authors: Chin Loong Chan
    Abstract:

    SUMMARY A practical and efficient approach of implementing second-order reliability method (SORM) is presented and illustrated for cases related to Foundation Engineering involving explicit and implicit limit state functions. The proposed SORM procedure is based on an approximating paraboloid fitted to the limit state surface in the neighborhood of the design point and can be easily carried out in a spreadsheet. Complex mathematical operations are relegated to relatively simple user-created functions. The failure probability is calculated automatically based on the reliability index and principal curvatures of the limit state surface using established closed-form SORM formulas. Four common Foundation Engineering examples are analyzed using the proposed method and discussed: immediate settlement of a flexible rectangular Foundation, bearing capacity of a shallow footing, axial capacity of a vertical single pile, and deflection of a pile under lateral load. Comparisons with Monte Carlo simulations are made. In the case of the laterally loaded pile, the friction angle of the soil is represented as a one-dimensional random field, and pile deflections are computed based on finite element analysis on a stand-alone computer package. The implicit limit state function is approximated via the response surface method using two quadratic models. Copyright © 2011 John Wiley & Sons, Ltd.

Fred H. Kulhawy - One of the best experts on this subject based on the ideXlab platform.

  • Foundation Engineering for Transmission Line Structures
    Art of Foundation Engineering Practice, 2010
    Co-Authors: Fred H. Kulhawy, Anwar Hirany
    Abstract:

    An overview is given of the development and practice of Foundation Engineering for electrical transmission line structures (TLS). The evolution of this specialty field has been very different from its evolution for building and/or bridge structures. The differences involved are substantial and relate to the structure types, loading, threat to life, ground assessment over long corridors, construction issues, and various other factors. Unfortunately, these key issues are not addressed in traditional references such as textbooks or design manuals, and they are not covered in standard university courses in Foundation Engineering. Accordingly, designers, constructors, and others in the electric utility industry have developed alternative approaches toward Foundation Engineering for TLS. This paper presents an overview of this specialty field and discusses some pertinent issues regarding the structures, loading, Foundations, geotechnical assessment, design philosophy, and construction issues.

  • uncertainty reliability and Foundation Engineering the 5th peter lumb lecture
    HKIE Transactions, 2010
    Co-Authors: Fred H. Kulhawy
    Abstract:

    Peter Lumb was among the first civil engineers to focus on the role of uncertainty in geotechnical Engineering practice and design. His seminal work on this topic illustrated clearly that proper geotechnical design should be based on probabilistic, not deterministic, principles. More than four decades later, our profession is still trying to address this reality. This lecture and paper focus on some of these issues, with particular emphasis on reliability-based design (RBD) of Foundations and the calibrations behind RBD that are critical but are largely ‘invisible’. Some key methods of calibration are discussed, including issues ranging from the basic assumptions involved, distributions of key variables, uncertainties in both load and resistance, target reliability, etc. The goal is to assist engineers in understanding the level of sophistication, or lack thereof, in different approaches to calibrations, which then translates into the degree of confidence one can have in a particular calibration or code. ...

  • Practical Reliability-Based Design Approach for Foundation Engineering
    Transportation Research Record, 1996
    Co-Authors: Kok-kwang Phoon, Fred H. Kulhawy
    Abstract:

    A research study was completed recently that was directed toward the development of practical, reliability-based design (RBD) equations specifically for Foundation Engineering. Some of the key RBD principles used in the study are presented. The important considerations involved in the development of practical and robust RBD criteria are emphasized. In particular, the selection of an appropriate reliability assessment technique and the careful characterization and compilation of geotechnical variabilities are important because of their central role in the calculation of the probability of failure and the assessment of the target reliability level. An overview of a simplified RBD approach is given, and an application of this approach to the ultimate limit state design of drilled shafts under undrained uplift loading is discussed.

Dai Guo-zhong - One of the best experts on this subject based on the ideXlab platform.