Pre-stressed Steel System Post Tensioned Slab Case Study: K- Financial Tower.

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Presentation transcript:

Pre-stressed Steel System Post Tensioned Slab Case Study: K- Financial Tower

K- FINANCIAL TOWERS

BENEFITS  Less Columns  Less Beams  Thinner slabs  Controlled deflection  Flexibility of Layout & Services  Lighter Structure  Less Foundations  Less Rebars  Less Workmanship  Better Durability  Quicker turn-around of the Formwork  Fast Construction  Cost Saving

PRINCIPLES OF PRESTRESSING

Illustrative example  Illustrative P 2 P cos  For harped profile   P

W Vd Va P P Free-body diagram of tendon Free-body diagram of beam after removal of tendon Force system between tendon and beam P Va W Vd P Illustrative example  Illustrative

BONDED Bond is achieved throughout the length of the tendon by a cementitious matrix called grout PT force along the tendon is a function of the deformation of the concrete  How it is bonded:

K - FINANCIAL TOWERS TYPICAL FLOORS

SLAB MESHING

LATITUDE TENDONS

LONGITUDE TENDONS

Ultimate moment Mx

Ultimate moment My

Service Bottom X stress Plan

Service Bottom Y stress Plan

Service Top X stress Plan

Service Top Y stress Plan

Long term deflection plan

EXECUTION By nominated local installation agent

SUMMARY OF POST-TENSIONING EXECUTION

POST-TENSIONING INSTALLATION FORMWORK SIDE-SHUTTER FIXING OF ANCHORS MARKING OF THE SLAB TENDON INSTALLATION PROFILING & FINISHING

CHECKING BEFORE THE CASTING No. OF ANCHORS AND TENDONS PROFILES GROUT VENTS BURSTING REINFORCEMENT Additional Rebar (Bursting, Punching Shear) PROPPING AND FORMWORK

CASTING PROPER VIBRATION AROUND THE ANCHORS CONCRETE TO BE PLACED WITHOUT DAMAGING THE TENDONS PROPER CURING OF THE CONCRETE AFTER THE CASTING

STRESSING REMOVE THE SIDE-SHUTTER CRUSH CUBE FOR TESTING THE CONCRETE STRENGTH START STRESSING TO 100% IF CONCRETE IS AT 25 MPA IN LESS THAN 3 DAYS DO PARTIAL STRESSING IF REQUIRED TAKE READINGS AFTER

APPROVAL SEND STRESSING RECORDS TO THE P/T CONSULTANT FOR APPROVAL CUT THE TAILS AFTER APPROVAL FILL THE POCKETS PREPARE FOR GROUTING

GROUTING SHUTTER CAN BE REMOVED ADEQUATE PROPPING TO BE PLACED GROUTING OPERATIONS CAN START AT ANY TIME