Shailendra Kumar

A capacidade de carga e a instala o de funda es um fen meno grave nos dias de hoje. Este livro ajuda a estudar a nova abordagem na supera o da lacuna nesta rea de Geossint ticos em pr -esfor o e tamb m nfase no c lculo da melhoria da capacidade de suporte e redu o do assentamento utilizando funda es em pr -esfor o numa abordagem inovadora que pode ser aplicada para as aplica es de campo em tempo real na Engenharia Civil.

Tragf higkeit und Setzungen von Fundamenten sind heutzutage ein ernstzunehmendes Ph nomen. Dieses Buch hilft bei der Untersuchung des neuen Ansatzes zur berwindung der L cke in diesem Bereich der vorgespannten Geokunststoffe und legt auch den Schwerpunkt auf die Berechnung der Verbesserung der Tragf higkeit und der Verringerung der Setzungen durch vorgespannte Fundamente in einem innovativen Ansatz, der f r die Feldanwendungen im Bauwesen in Echtzeit angewendet werden kann.

La capacit portante e l'assestamento delle fondazioni sono un fenomeno grave al giorno d'oggi. Questo libro aiuta a studiare il nuovo approccio per superare le lacune in questo settore dei geosintetici precompressi e pone l'accento sul calcolo del miglioramento della capacit portante e della riduzione dell'assestamento utilizzando fondazioni precompresse con un approccio innovativo che pu essere applicato sul campo in applicazioni di ingegneria civile in tempo reale.

This book presents formulation and numerical results of the double - K fracture parameters of concrete obtained using various analytical models. Due to several advantages of split-tension cube test, development of double-K fracture model for the split-tension cube specimen is also presented in the book. Further, application of peak load method for determining the fracture parameters of double - K fracture model is introduced in which the need of clip gauge for measurement of crack opening displacement during the test is avoided. For purpose of all the computations, cohesive crack model is developed for different test geometries.

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Cementitious materials, rocks and fibre-reinforced composites commonly termed as quasibrittle, need a different fracture mechanics approach to model the crack propagation study because of the presence of significant size of fracture process zone ahead of the crack-tip. Recent studies show that concrete structures manifest three important stages in fracture process: crack initiation, stable crack propagation and unstable fracture or failure. Fracture Mechanics concept can better explain the above various stages including the concepts of ductility, size-effect, strain softening and post-cracking behavior of concrete and concrete structures. The book presents a basic introduction on the various nonlinear concrete fracture models considering the respective fracture parameters. To this end, a thorough state-of-the-art review on various aspects of the material behavior and development of different concrete fracture models is presented. The development of cohesive crack model for standard test geometries using commonly used softening functions is shown and extensive studies on the behavior of cohesive crack fracture parameters are also carried out. The subsequent chapter contains the extensive study on the double-K and double-G fracture parameters in which some recent developments on the related fracture parameters are illustrated including introduction of weight function method to Double-K Fracture Model and formulization of size-effect behavior of the double-K fracture parameters. The application of weight function approach for determining of theKR-curve associated with cohesive stress distribution in the fracture process zone is also presented. Available test data are used to validate the new approach. Further, effect of specimen geometry, loading condition, size-effect and softening function on various fracture parameters is investigated. Towards the end, a comparative study between different fracture parameters obtained from various models is presented.

Cementitious materials, rocks and fibre-reinforced composites commonly termed as quasibrittle, need a different fracture mechanics approach to model the crack propagation study because of the presence of significant size of fracture process zone ahead of the crack-tip. Recent studies show that concrete structures manifest three important stages in fracture process: crack initiation, stable crack propagation and unstable fracture or failure. Fracture Mechanics concept can better explain the above various stages including the concepts of ductility, size-effect, strain softening and post-cracking behavior of concrete and concrete structures. The book presents a basic introduction on the various nonlinear concrete fracture models considering the respective fracture parameters. To this end, a thorough state-of-the-art review on various aspects of the material behavior and development of different concrete fracture models is presented. The development of cohesive crack model for standard test geometries using commonly used softening functions is shown and extensive studies on the behavior of cohesive crack fracture parameters are also carried out. The subsequent chapter contains the extensive study on the double-K and double-G fracture parameters in which some recent developments on the related fracture parameters are illustrated including introduction of weight function method to Double-K Fracture Model and formulization of size-effect behavior of the double-K fracture parameters. The application of weight function approach for determining of theKR-curve associated with cohesive stress distribution in the fracture process zone is also presented. Available test data are used to validate the new approach. Further, effect of specimen geometry, loading condition, size-effect and softening function on various fracture parameters is investigated. Towards the end, a comparative study between different fracture parameters obtained from various models is presented.