Multi-storey Precast Concrete Framed Structures PDF

Multi-storey Precast Concrete Framed Structures by Kim S. Elliott and Colin K. Jolly

Preface of Multi-storey Precast Concrete Framed Structures by Kim S. Elliott and Colin K. Jolly

Of all the major forms of multi-storey building construction, structural precast concrete is perhaps understood by the fewest practitioners. This is a signiicant ‘blind spot’ in that part of the building profession associated with the design and construction of large or small multi-storey precast and prestressed concrete frames. This is due mainly to two particular factors: The notion of using a modular form of construction, such as precast concrete, is not widely taught at undergraduate level because it is thought of as being too restrictive in the wider application of theory and design instruction.  Precast concrete design is usually carried out in-house by the small number of specialist engineers employed by the precast manufacturing companies. Consequently, the trainee structural designer is rarely exposed to the virtues of using precast concrete in this way. Opportunities to study the basic concepts adopted in the design, manufacturing and site erection stages are not often made available to the vast majority of trainees. Even where precast concrete is accepted as a viable alternative form of construction to e.g. steelwork for medium to high-rise structures, or to insitu concrete for some of the more complex shaped buildings, or to masonry for low-rise work, it is often considered only at a late stage in the planning process. In these situations, precast concrete is then often restricted to the substitution of components carrying their own locally-induced stresses.

The economic advantage of the precast components also carrying global stresses is lost in the urgency to commence construction. Indeed, precast component design has long been considered as having a secondary role to the main structural work. Only more recently have precast designers been challenged to validate the fundamental principles they are using, and to give clients conidence in precast concrete design solutions for entire structures. To meet ever-increasing building specifications, precast manufacturing companies have considerably reined the design of their product. They have formed highly effective product associations dealing with not only the marketing and manufacturing of the product, but also with technical matters. These include common design solutions, research initiatives, education, united design approaches, and, importantly, the encouragement of a wider appreciation of precast structures in the professional design office. Even so, the structural and architectural complexity of some of the more recent precast frames has widened the gap between precast designers and the rest of the profession.

Multi-storey Precast Concrete Framed Structures by Kim S. Elliott and Colin K. Jolly PDF Download

The latter have limited sources for guidance on how the former are working. Satisfying codes of practice and the building regulations plays only a minor role in the total package; there is so much more, as this book shows. Nowadays, the use of precast reinforced and prestressed concrete for multi-storey framed buildings is widely regarded as an economic, structurally sound and architecturally versatile building method. Design concepts have evolved to satisfy a wide range of commercial and industrial building needs. ‘Precast concrete frames’ is a term which is now synonymous with high quality, strength, stability, durability and robustness. Design is carried out to the highest standard of exactness within the concrete industry and yet the knowhow, for the reasons given above, remains essentially within the precast industry itself. Precast concrete buildings do not behave in the same way as cast-in situ ones.

The components which make up the completed precast structure are subjected to different forces and movements from the concrete in the monolithic structure. It is necessary to understand where these physical effects come from, where they go to, and how they are transferred through the structure. Consequently, this book aims to disseminate understanding of the disparate procedures involved in precast structural design, from drawing office practice to explaining the reasons for some of the more intricate operations performed by precast contractors on site. The principal focus is upon on skeletal frame type structures, the most extensively used form of precast structural concrete.

They are dfined as frameworks consisting essentially of beams, columns, slabs and a small number of shear walls. From the structural and architectural viewpoints, skeletal frames are the most demanding of all precast structures. They contain the smallest quantity of structural concrete per unit volume. The precast components can be coordinated into the architectural façade, both internally and externally, to meet the social, economic and ecological demands that are now required. Ever greater accuracy, quality control, and on-site construction efficiency are being demanded and achieved. The construction industry is turning to high-specification prefabricated concrete for its advancement, using ‘factory engineered’ precasting techniques. The chapters in this book have been arranged so that different parts of the design process can be either isolated (for example in the cases of precast flooring, or of connections), without the reader necessarily referring to the overall frame design, or read sequentially to realise the entire design. Chapters 1 to 3 present an overview of the subject in a non-technical way.

Multi-Storey Precast Concrete Framed Structures 2nd Edition

Chapters 4 to 9 describe, in detail, the design procedures that would be carried out in a precast manufacturing company’s design office. Chapter 10 describes the relevant site construction methods. Numerous examples have been used to demonstrate the application of design rules, many of which are not code-dependent. There are many aspects to the design of precast skeletal frames that have evolved through the natural development of precast frame design since the 1950s. One aim of this book is to update and coordinate this information for the future. Historically, the precast concrete industry considered many of its design techniques commercially sensitive, particularly those for connector design, and was consequently criticised by developers and consultants. More information is now freely available since the expiry of many patents of ideas. One of the main purposes of the first edition was to bring together in a coherent manner, for the benfit of everyone, the widely varied design methods used in the industry. The second edition aims to extend that process in the context of continually developing technology and the introduction of Europe-wide design requirements embodied in the Eurocodes. It also demonstrates the trend towards greater, often fully serviced, spatial precast components. Precast concrete designs are not entirely code-dependent, but the primary recommendations are in accordance with Eurocode 2 (BS EN 1992-1-1) and its predecessor BS 8110. Where the design procedures from the two codes differ, they are explained.

Where major differences occur, or accumulate in design examples, the text is presented in two parallel columns with the Eurocode version in the left column and the BS 8110 text in the right column. When minor textual differences occur for the application of the two codes, Eurocode 2 forms the basic text, with the alternative BS text within braces or curly brackets thus: {to BS 8110}. It may help the reader to know that the authors have retained braces exclusively for this purpose, leaving the use of round brackets for the two contextually differentiable functions of parenthesis or mathematical grouping, and square brackets for references. The combination of a broad overview, background research, and detailed analysis, the references to the familiar British Standards and the new Eurocodes, and an extensive range of illustrations together combine to offer a valuable resource for both undergraduate and practising engineers in the field of precast concrete.

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