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Construction and Design of Multistorey Building-05

Published on July 2016 | Categories: Types, Presentations | Downloads: 24 | Comments: 0
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Construction and Design of Multistorey Building

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INTRODUCTION/BENEFITS
 Post-tensioning is a method of reinforcing (strengthening)

concrete or other materials with high-strength steel strands or
bars, typically referred to as tendons


allows longer clear spans, thinner slabs

 lower overall building height for the same floor-to-floor height.
 allows a high degree of flexibility in the column layout, span

lengths and ramp configurations

POST TENSIONING

PLACEMENT OF TENDONS








Positioning and fixing of casting and block-outs to the edge formwork
or construction joint formwork
The support bars shall be prepared in advance.
Lay tendons according to tendon layout in accordance with the
drawings.
Fix tendons to correct profiles with support bars and chairs and the
tendons are made with provisions for grouting using grout using grout
vents and grout hoses
Prepare installation report for every installation as per the enclosed
format.
tolerance of tendon profiles is recommended as follows:

**vertical: + 5 mm (at lowest and highest points)

Horizontal: + 100 mm

PROJECT 3
DESIGN OF SHUTTERING

LOADS ON FALSEWORK
Loads on Falsework are any combinations of
the following:
 Dead loads,
 Imposed loads,
 Environmental loads,
 Incidental loads during erection and
operation, and
 Lateral pressure.

DIFFERENT LOAD DATA
 Self load shall be determined by either actual measurement or in







accordance with IS 875 (Part I) the unit weight of wet concrete including
reinforcement shall be taken as 26 kN/m². However, in absence of the
data, load may be assumed as 500 N/M2 for the purpose of initial
calculations .
Loads during constructional operation shall constitute the imposed
loads [see IS 875 (Part 2 ) Where allowance has only to be made for
access and inspection purposes, a loading of 750 N/m² should be
adequate
The lateral pressure due to fresh concrete depends on the temperature
of concrete as placed, the rate of placing of concrete and the concrete
mix proportion
Wind loads should be taken for design in accordance with IS 875 (Part
3 ) subject to a minimum horizontal load equal to 3 percent of the
vertical loads at critical level.
Snow loads should be assumed in accordance with IS 875(4) . The
maximum density of ice may be assumed to be 900 kg/m³.

OUTPUT OF EXCEL SHEET
(DOFW)

End Note
 This presentation is for educational use can

use this as part of reference material and it
should not be used directly as your own
presentation.
 For more such presentation log on to
 www.engineeringcivil.com

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