Concrete cone is one of the failure modes of anchors in concrete , loaded by a tensile force. The failure is governed by crack growth in concrete, which forms a typical cone shape having the anchor's axis as revolution axis. A constant distribution of tensile stresses is then assumed. The model is based on fracture mechanics theory and takes into account the size effect , particularly for the factor h e f 1. In the case of concrete tensile failure with increasing member size, the failure load increases less than the available failure surface; that means the nominal stress at failure peak load divided by failure area decreases.
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Dikeou and David W. Fowler Published by the American Co Download PDF. Recommend Documents. Safety of reinforced concrete members designed following ACI building code. ACI awards. ACI Standard: Standard practice for selecting proportions for structural lightweight concrete.
Nonsingular ACI-matrices over integral domains. European airports: the position of ACI Europe. Guide for structural lightweight aggregate concrete: report of ACI committee Standard practice for the use of shrinkage — Compensating concrete ACI Concrete design: U. In the following decade and a half, there has been significantly greater understanding and appreciation of the role of polymers in concrete construction, and extensive research and wide ranging applications have been achieved. Four international Congresses have been held with the fifth due to be held in Brighton in September this year, with the emphasis on production, performance and potential.
The present volume, special publication SP, contains the papers presented at the symposium held at the Fall Convention in Kansas City, Missouri. There are 17 papers included in this volume, covering all the three major forms of the use of polymers in concrete- polymer concrete, polymer modified concrete and polymer impregnated concrete.
There are seven papers devoted to polymer modified concrete and four to polymer impregnated concrete. Six papers discuss various applications, whilst the rest describe new developments, material properties, and structural behaviour. Applications discussed in the papers refer to highway repairs such as sealing and filling cracks, spalls and punch-outs, bonding precast elements, bridge rehabilitation and dam repairs. Other developments reported in the papers include epoxy modified shotcrete for concrete repairs and the use of acryl-type polymers to produce underwater concrete which will not only prevent segregation but also not affect the hydration of cement.
It is shown that very high strength concrete, having compressive strengths of MPa can be produced by polymer impregnation and involving either the use of microsilica as a constituent of the concrete or by high pressure polymerization up to atmospheres.
The super high strength is achieved through increased polymer loading, superior interfacial bond strength and a combination of mix proportioning and operating techniques. Several papers discuss various properties of polymer concretes - the tensile splitting strength of partially impregnated cylinders, creep and fatigue of polymer concrete, shear transfer behaviour, flexural behaviour of polymer modified concrete structural elements, and the strength and ductility aspects of polymer concrete containing fibres, and their relevance to seismic resistant structures.
These and other papers show how polymers can be utilised to generate properties and behaviour required for engineering applications, and how, with appropriate modifications, a new generation of construction materials can be developed for a variety of uses in concrete construction. This volume, like its predecessors, puts polymer concrete in its most advanced forms for the benefit of concrete engineers.
This revised code for nuclear structures emphasizes the importance of the minimum requirements for the design and construction of concrete structures, which are typical of nuclear power generating stations, and where protection against potential radioactive releases could be a major concern.
The type of structures and structural elements subject to this code exclude concrete reactor vessels and containment structures covered in ACI standard , but include all those concrete structures which support, house or protect nuclear safety class systems, or which are components of nuclear safety class systems.
Both the code and commentary are included in one publication, and the ACI Committee who prepared this document deserve congratulations for bringing this standard up4o-date to ensure the safety, reliability and structural integrity of such structures. The Code is divided into five parts containing 19 chapters in total. Part 1 has two chapters dealing with general requirements such as scope, inspection, approval of special systems of design or construction, quality assurance program and definitions.
Standards for tests and materials are covered in one chapter in Part 2. Part 3 specifies construction requirements and deals with concrete quality, mixing and placing concrete, formwork and related topics, and detailing of reinforcement. Part 4 sets out the essential requirements of analysis, design, strength and serviceability, and covers flexural and axial loads, shear and torsion.
Special emphasis is given to reinforcement development and splices, and a whole chapter is devoted to this very important part of design. Various structural systems and structural elements are discussed in Part 5, and these include slab systems, walls, footings, shells, precast and prestressed concrete and composite members.
Five appendices provide additional requirements in terms of thermal variations, impulsive and impactive load effects and steel embedments.
The Commentary provides valuable background information to the provisions of the Book reviews Code, and contains specialist references where appropriate.
This document should be a valuable guide to design engineers, planners and contractors involved in the nuclear industry. ISBN 0 A. This is a very unique publication that can be brought about only by experts working in specialist technical committees belonging to international organisations such as RILEM.
Until very recently, design for dynamic behaviour had largely been confined to steel structures. However, the several advances in materials, design and technology have brought concrete into the forefront of construction of structures such as long span bridges, offshore platforms, TV and transmission towers, to all of which dynamic behaviour is critical in design.
This publication, produced by RILEM 65 MDB Committee, provides an authoritative and extensive overview of the analysis, testing and performance of such structures, subjected to different dynamic loading conditions. The text consists of six chapters, beginning with basic principles and definitions, and then proceeding to deal with complex problems and technologies of different structures.
Chapter 1 introduces time dependent and dynamic loads, and the effects of dynamic loads on structures are illustrated. The fundamental principles of dynamic analysis are dealt with in chapter 2. Single and multiple degree-of-freedom systems, free, forced and random vibrations and non-linear systems are discussed. Several examples of dynamic systems are also worked out. Loading and loading effects are critically assessed in chapter 3. Special attention is given to loads caused by wind, wave, seismic and mechanical plant, and their effects on structural fatigue and human discomfort are described.
Dynamic testing, techniques of measurement, data acquisition and analysis are all important aspects for understanding dynamic behaviour, and these are all extensively discussed in chapter 4. Laboratory techniques as well as field work are emphasized. Chapter 5 is a comprehensive review of the dynamic behaviour of different types of concrete structures. Loading conditions, design criteria and dynamic performance of a wide range of structures from buildings to bridges are explained in detail.
In the concluding chapter recommendations in relation to loading, testing and design methods are all brought together with suggestions for further research. The unique value of this book is that each chapter contains contributions from a large number of experts, from both within and outside the Committee; and in spite of this diverse input, the text presents a coherent reading of the subject.
There are a good number of references at the end of each chapter; this, together with the worked examples in chapter 2, should make the book highly appealing and relevant to students, researchers and designers. There is invaluable information expertly put together; each section is self-sufficient, and design is given prominence just as much as analysis and performance. The book should serve as a reliable reference book for many years to come.
Mindess and S. Concrete materials are increasingly used for structures such as long span bridges, TV and transmission towers, and tall chimneys where dynamic loading becomes a major criterion of design. Impact and impulsive loading, and explosive Ioadings, are, in a way, specialist requirements which could occur even in ordinary structures.
However, the response of such structures to high rates of loading is still not clearly understood. This volume, devoted to the strain rate effects on strength and fracture of concrete materials and concrete composites, provides an insight into the type of dynamic response to be expected from such structures. The papers contained in this publication were presented at the Materials Research Society Symposium held in Boston, Massachusetts in December There are 21 papers included in this volume, almost all papers dealing with plain or fibre reinforced concrete.
There are regrettably no papers dealing with dynamic fractures of concrete structures, although it is well known that, for example, structural elements designed to fail in flexure and full ductility, under static loading, may fail in a brittle fashion and generate secondary shear failures under high rates of loading.
Of the 21 papers, four are devoted to dynamic fracture of plain concrete including confined concrete. Tests reported include Mode I and Mode II fractures, DCB tests, and prisms confined by high tensile steel bolts inserted horizontally in two orthogonal directions and grouted with high strength epoxy resin. Four papers discuss the high strain rate effects on the tensile strength of plain and fibre concrete; both linear fracture mechanics and thermodynamic models are presented to predict the stress or strain effects.
Three papers are devoted to cement paste including MDF cement composite- these report crack growth in tension and compression. Tests on MDF cement show that the material, as would be expected, exhibits an essentially linear elastic behaviour, but with a fracture toughness only slightly higher than that of normal hardened cement paste.
International Concrete Abstracts Portal
Dikeou and David W. Fowler Published by the American Co Download PDF. Recommend Documents. Safety of reinforced concrete members designed following ACI building code.
Concrete cone failure
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts. Author s : T. Balough, G. Kovacshazy and A. Publication: Symposium Paper. Keywords: anchors fasteners ; concretes; embedment; loads forces ; pullout tests; Structural Research.