Read e-book online Design of Prestressed Concrete PDF

By Raymond Ian Gilbert, Neil Mickleborough

ISBN-10: 0419161600

ISBN-13: 9780419161608

The layout of constructions often, and prestressed concrete buildings specifically, calls for significantly additional info than is contained in development codes. a legitimate figuring out structural behaviour in any respect levels of loading is key. the purpose of this booklet is to give a close description and clarification of the behaviour of prestressed concrete contributors and buildings either at provider quite a bit and at final so much and, in doing so, supply a complete consultant to layout. The layout standards and techniques contained in numerous significant construction codes, together with ACI 318-83, BS 8110:1985, and AS 3600-1988, also are offered. each one element of the research and layout of fully-prestressed and partially-prestressed concrete participants is approached from first ideas and illustrated by means of labored examples. The textual content is written for senior undergraduate and post-graduate scholars of civil and structural engineering and likewise for training structural engineers.

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In order to satisfy the design criteria set down in codes of practice, methods of design and analysis should be used which are appropriate to the limit state being considered. For example, if the strength of a cross-section is to be calculated, ultimate strength analysis and design procedures are usually adopted. Collapse load methods of analysis and design (plastic methods) may be suitable for calculating the Page 18 strength of ductile, indeterminate structures. If the serviceability limit states of excessive deflection (or camber) or excessive cracking are considered, an analysis which accounts for the non-linear and inelastic nature of concrete is usually required.

The highstrength prestressing steel is most often tensioned using hydraulic jacks. The tensioning operation may occur before or after the concrete is cast and, accordingly, prestressed members are classified as either pretensioned or post-tensioned. 2 illustrates the procedures for pretensioning a concrete member. The prestressing tendons are initially tensioned between fixed abutments and anchored. With the formwork in place, the concrete is cast around the highly stressed steel tendons and cured.

Because of the relatively large scatter of measured tensile strengths, the lower end of this range is usually specified in building codes [such as ACI 318–83 (1983) and AS 3600 (1988)]. 67. In practice, concrete is often subjected to multi-axial states of stress. For example, a state of biaxial stress exists in the web of a beam, or in a shear wall, or a deep beam. Triaxial stress states exist within connections, in confined columns, in two-way slabs, and other parts of a structure. A number of experimental studies of the behaviour of concrete under multi-axial states of stress (particularly biaxial stress) have been undertaken, including those by Kupfer et al.

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Design of Prestressed Concrete by Raymond Ian Gilbert, Neil Mickleborough

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