The advance of prestressing expertise has constituted one of many extra vital advancements within the fields of structural engineering and building. Referring really to post-tensioning purposes, it really is often famous the way it opens the chance to enhance economic system, structural habit and aesthetic facets in concrete solutions.
In spite of the simplicity of its uncomplicated thoughts and famous merits, the appliance volume of post-tensioning strategies can't be thought of harmonized within the diverse components and structural functions. actually, for numerous purposes, it seems that the capability provided by means of prestressing is way from being totally exploited, particularly in construction constructions box. in lots of situations the place post-tensioning would supply a visibly improved answer, it occurs in any case extra traditional non-prestressed resolution is usually selected.
The major goal of this fib Technical document is consequently to teach the advantages of utilizing post-tensioning for the extra universal useful functions in concrete structures. The rfile is especially addressed to architects, contractors and vendors. it's also drafted with the objective of motivating development designers to take advantage of post-tensioning: easy layout points with regards to prestressing results and layout standards are summarized and conceptual layout points are emphasized.
A set of sensible examples is gifted, displaying the followed recommendations and their merits whilst assembly the necessities of particular difficulties. the chosen examples have been accurately now not selected simply because they're notable constructions. in fact, post-tensioning rules and know-how can be utilized in any constitution, independently of its value, masking quite a lot of construction structural purposes, bettering the constitution caliber and selling concrete as a structural material.
The merits of utilizing post-tensioning, referring to structural habit, economic system, detailing and confident features, are illustrated via the presentation of a number of latest constructions, so much of them designed by means of operating social gathering individuals. common layout calculations are usually not offered, yet layout effects displaying the development in structural habit are illustrated.
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Additional resources for FIB 31: Post-tensioning in buildings
In layout c), the transverse effect goes directly to the supports. For a given amount of tendons, it is generally the most efficient layout with regard to both punching and deflections. This case can be seen as an ordinary slab supported on beams = the column strips. The “ordinary slab” may require more ordinary reinforcement than in the other alternatives, but the favourable axial effect of prestress can be fully utilized in the design of this reinforcement, at least for interior spans. The axial effect depends mainly on the total amount of tendons and not so much on their distribution, except near the anchorages; the compressive stress can be assumed to be uniformly distributed already at a distance about 3/4 of the largest tendon spacing.
1]. 1: Examples of slab thickness and indication of maximum span for solid slabs with ordinary ( ) and prestressed ( ) reinforcement. Apart from the stated imposed load, there is also self-weight plus 0,5 kPa for partitions. 1. 2. Slabs supported on flexible beams will behave between ordinary and flat slabs, depending on the stiffness of beams. 1 should only be seen as indications, not as definite limits. For ordinary slabs the criterion has been that the slab should remain uncracked in SLS, in order to limit deflections.
Grout shall be continuously agitated until it is pumped. d) Pumping - grout is continuously pumped thought a tendon. When grout is continuously ejected from the outlet with no visible slugs of air or water, close the inlet valve prior to reliving the pressure at the pump. 0 N/mm2. 1 All equipment and procedure used for handling and placing tendons shall not damage or cause deterioration to the prestressing steel, duct or components. 2 All concrete inserts must be cast-in-place. If additional inserts are required after the concrete is cast, the contractor must locate tendons at the surface before driving fasteners.
FIB 31: Post-tensioning in buildings