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    الأربعاء، 15 يونيو، 2016

    Crack Analysis in Structural Concrete Theory and Applications


    Crack Analysis in Structural Concrete Theory and Applications


    This book is an outgrowth of my research in the broad field of fracture mechanics over a period of
    twenty years, the past fifteen years of which I have spent focusing on a subbranch of the discipline—
    that is, fracture mechanics of concrete. My late decision to focus on this field of study
    was motivated by two factors, namely, a surging demand for crack analysis in structural concrete
    and a keen personal interest in the subject. Compared with other mature engineering disciplines,
    fracture mechanics of concrete is still a developing field that is wonderfully rich in scope and
    diversity and full of challenging issues to be studied.
    In recent years a wide range of models and applications have been proposed for crack analysis,
    and an impressive array of useful information has been accumulated. As a result, the theoretical
    basis of the discipline has been strengthened; a number of fundamental issues solved; and the
    range of applications widened. As the subject is approaching its early stage of maturity, it is
    imperative for students to learn the fundamental theoretical advances that have been made, and
    engineers need to familiarize themselves with newly developed numerical solution techniques.
    I have written this book to summarize the recent theoretical advances in the computational

    fracture mechanics of concrete, especially regarding the discrete approach to multiple-crack analysis
    and mixed-mode fracture. The extension of the Fictitious Crack Model (FCM) to address
    these problems has greatly expanded the range of crack analysis in structural concrete. The book
    begins with a brief introduction to the fundamental theories of linear elastic fracture mechanics
    and nonlinear fracture mechanics of concrete. Then, after addressing the issue of stress singularity
    in numerical modeling and introducing some basic modeling techniques, the Extended Fictitious
    Crack Model (EFCM) for multiple-crack analysis is explained with numerical application examples.
    This theoretical model is then used to study two important issues in fracture mechanics:
    (1) crack interaction and localization and (2) failure modes and maximum loads. The EFCM is
    subsequently reformulated to include the shear transfer mechanism on crack surfaces and the
    method is used to study experimental problems. Following these theoretical developments, an
    application example in tunnel engineering is discussed, which shows how the EFCM can be built
    into a pseudoshell model for crack analysis of tunnel linings that takes the earth–tunnel interaction
    into account. Because the book is written both for students and practicing engineers, an effort has
    been made to present a balanced mixture of theory, experiment, and application.

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