The advance of prestressing expertise has constituted one of many extra very important advancements within the fields of structural engineering and development. Referring rather to post-tensioning functions, it truly is normally well-known 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 easy options and famous merits, the appliance quantity of post-tensioning strategies can't be thought of harmonized within the diversified parts and structural purposes. in truth, for numerous purposes, it seems that the capability provided by means of prestressing is much from being absolutely exploited, in particular in construction buildings box. in lots of circumstances the place post-tensioning would supply a visibly enhanced answer, it occurs in spite of everything extra traditional non-prestressed answer is frequently selected.
The major goal of this fib Technical document is hence to teach some great benefits of utilizing post-tensioning for the extra universal functional purposes in concrete structures. The rfile is especially addressed to architects, contractors and vendors. it's also drafted with the target of motivating construction designers to exploit post-tensioning: uncomplicated layout points concerning prestressing results and layout standards are summarized and conceptual layout points are emphasized.
A set of functional examples is gifted, exhibiting 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. on the contrary, post-tensioning rules and know-how can be utilized in any constitution, independently of its value, masking a variety of construction structural functions, bettering the constitution caliber and selling concrete as a structural material.
The merits of utilizing post-tensioning, bearing on structural habit, financial system, detailing and confident elements, are illustrated through the presentation of numerous current buildings, such a lot of them designed by means of operating social gathering individuals. common layout calculations aren't awarded, yet layout effects displaying the advance in structural habit are illustrated.
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Example text
The downstand beams are fixed to the columns. Due to the prestressing of the beams a redistribution of the sectional forces of the beams to the columns is constrained. Since the columns are adequately overstressed due to the normal force, they are able to withstand the high bending moments. The columns will be built beforehand in three stages. The anchorage and starter bars will be already installed in the column elements. The downstand beams are enclosed in formwork panels of large area. Because of the generous width of the downstand beam the stirrup reinforcement and the few longitudinal bars as well as the prestressing cables consisting of bundles, each with 4 single strands, could be inserted without any problems.
23: Views of monostrand bundles at anchorage and over support. Monostrands can be supplied from the workshop already bundled and placed in this form. 0005 m-1 Corrosion protection The corrosion protection should be in accordance with fib or PTI recommendations. The plastic sheathing (PE or PP) forms the primary protection of the monostrand and the corrosion preventive grease the secondary protection. 24: Tendons connected by webs to a flat band (VT-CMM-System) B Stressing anchorage The components of the stressing anchorages are the anchorage body of cast steel (sprayed at the workshop with a corrosion preventive oil) with wedges, a polyethylene sealing sleeve and the recess former.
Brochure VSL Brochure DSI – DYWIDAG Brochure Freyssinet Brochure VT Vorspann – Technik fib Bulletin No. 11 – Factory applied corrosion protection of prestressing steel, 2001. fib Bulletin No. 15 – Durability of post-tensioning tendons, 2001. 0 mm2/strands Tensile Strength ftk = 1860 N/mm2 Yield Strength fy = 1670 N/mm2 Young’s modulus EP = 195000 N/mm2 Min. 0012 m-1 Wedge draw-in w = 6 mm Max. 1 Bearing plates shall be placed perpendicular to the tendon path and shall be shimmed as necessary. 2 Grout fittings shall be standard plastic pipe, black and galvanized steel or flexible plastic tubing at the placer’s option.