Description

Name Of File :- Design of Post-Tensioned Concrete Floor Based on ACI 318-02

Sheet No. 1:- Design of Post-Tensioned Concrete Floor Based on ACI 318-02
Sheet No. 2:- Design of Post-Tensioned Concrete Floor Based on ACI 318-02
Sheet No. 3:- Design of Post-Tensioned Concrete Floor Based on ACI 318-02
Sheet No. 4:- Design of Post-Tensioned Concrete Floor Based on ACI 318-02

Contents :-

•  Design Methods
  • Breakdown Of Floor Into Design Strips In Two Directions. Use This Software To Get Required Effective Post-tensioning Forces In Each Directions.
  • Banded All Tendons At Column In One Direction, And Distributed In The Other Direction. On The Design Drawings, Specify Total Required Effective Post-tensioning Forces At Banded Tendons, And Uniform Forces In Distributed Tendons.
  • When Tendon Less Than 140 Ft, Stress At One End. Otherwise Stress At Both Ends.
  • The Various Live Loading Conditions Should Be Consider By Input LL Zero At Some Spans.

Note :–

• The column moments are negligible for gravity punching design. Lateral loads, seismic and wind, should be supported by shear walls. Using equivalent frames to support lateral loads is not suggested.
• By inspection, the deflections of slab do not govern PT concrete floor design. Otherwise, using PT concrete floor is inadequate for larger live load. (ACI 318, 9.5.4.1)

Technical References :-

1. “Design of Post-Tensioned Slabs Using Unbounded Tendons, Third Edition”, The Post-Tensioning Institute, 2004.
2. “Design, Construction and Maintenance of Cast-in-Place Post-Tensioned Concrete Parking Structures, First Edition”, The Post-Tensioning Institute, 2001.
3. Bijan O. Aalami & Allan Bommer, “Design Fundamentals of Post-Tensioned Concrete Floors, First Edition”, The Post-Tensioning Institute, 1999.

• Design Methods
  • Breakdown Of Floor Into Design Strips In Two Directions. Use This Software To Get Required Effective Post-tensioning Forces In Each Directions.
  • Banded All Tendons At Column In One Direction, And Distributed In The Other Direction. On The Design Drawings, Specify Total Required Effective Post-tensioning Forces At Banded Tendons, And Uniform Forces In Distributed Tendons.
  • When Tendon Less Than 140 Ft, Stress At One End. Otherwise Stress At Both Ends.
  • The Various Live Loading Conditions Should Be Consider By Input Ll Zero At Some Spans.

• Input Data & Design Summary
  • Concrete Strength
  • Rebar Yield Stress
  • Tendon Properties
  • Slab Thickness
  • Tributary Width, Perpendicular
  • Column Width
  • Column Depth
  • Top Bar Size At Column
  • Bottom Continuous Bar Size